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Flower Full Sun Low water

Cosmos

Written by the GrowByCity Editorial Team · Updated April 2026
2 min read

Airy, delicate flowers on tall stems. A warmth-loving plant that does best between 15°C and 28°C, cosmos adapts well to tropical and subtropical conditions but cannot tolerate frost. Plant in a spot with full sun (6-8 hours of direct light daily) and provide minimal watering — it prefers dry conditions between drinks. Expect blooms in approximately 50-60 days. A magnet for pollinators, it supports bees, butterflies, and beneficial insects while brightening your garden.

Harvest 50-60 days
Temp Range 5°C — 35°C

Quick Answer: How to Grow Cosmos

Cosmos takes 50-60 days to harvest. It grows best in 15–28°C with full sun and low watering. Cosmos is not frost tolerant — wait until after the last frost to plant. It can be grown in 350 cities worldwide.

Find the best time to plant Cosmos in your city →

Growing Requirements

☀️
Sun
Full Sun
💧
Water
Low
❄️
Frost
Sensitive
📅
Harvest
50-60 days

Temperature Range

15-28°C
-10°C 45°C
Optimal: 15–28°C Tolerates: 5–35°C
Tropical suitable: Yes
Cities growing: 350 of 350

Growing Tips

💡

Expert Tips

Direct sow. Thrives on neglect -- don't fertilize. Wait until soil warms to at least 15°C before transplanting outdoors — cold soil stunts growth and can invite root rot. Overwatering is the most common mistake. Let soil dry out between waterings and ensure drainage is excellent.

Quick Facts

  • Grows in 350 of 350 cities
  • Available in 7 regions worldwide
  • Temperature range: 5°C to 35°C
  • Optimal growing: 15°C to 28°C
  • Harvest in 50-60 days

Did You Know?

  • 🌱 Cosmos loves the heat! It thrives in tropical and subtropical climates year-round.
  • 🌱 Cosmos needs at least 6-8 hours of direct sunlight daily for optimal growth.
  • 🌱 Cosmos is drought-tolerant — perfect for gardeners who tend to forget watering!

Step-by-Step Growing Guide

Cosmos thrives in poor to average, well-drained soil with a pH of 6.0–8.5 — unlike most flowering annuals, it actively declines in rich, amended soil, producing massive foliage at the expense of flowers. Do not add compost or fertilizer to the planting area. Direct sow seeds after last frost date, pressing them into the soil surface and covering with just 1/4 inch of soil. Thin to 12–18 inches apart once seedlings are 2 inches tall. Cosmos handles dry conditions remarkably well — water only when the top 2 inches of soil are completely dry, roughly every 7–10 days in summer. Overwatering is the most common mistake. No fertilizer is needed or wanted. In very long-summer climates, succession-sow every 3–4 weeks for continuous bloom. Plants grow 3–5 feet tall and may need staking in exposed, windy sites. Self-seeding is prolific — allow a few plants to set seed at season's end for a volunteer crop next year.

Common Pests & Problems

Aster yellows (phytoplasma disease) causes distorted, yellowed growth with stiff, brush-like abnormal flower heads — there is no cure; remove infected plants immediately and control leafhoppers that spread it with row covers early in the season. Powdery mildew appears late in the season on lower leaves in humid conditions — it's largely cosmetic at that stage, but if caught early, remove affected leaves and improve airflow. Aphids occasionally colonize stem tips — a strong jet of water is sufficient to dislodge them; avoid fertilizing with nitrogen as this draws aphid infestations. Botrytis can collapse spent flowers in wet weather — deadhead consistently to prevent this. Cosmos is otherwise remarkably trouble-free, which is the core of its garden value.

Harvest & Storage

Cut cosmos for vases when flowers are in half to three-quarter bud — fully open flowers shatter quickly after cutting. Harvest in the morning, cut long stems, and immediately place in cool water. Remove lower leaves to prevent rot. Vase life is 5–8 days. For seed saving, allow selected stems to fully mature and dry on the plant — seeds are ready when the petals have fallen and the seed heads are dry and brown. Store seed in a paper envelope in a cool, dry location; viability holds for 3 years.

Popular Varieties

'Sensation' is the classic tall mix reaching 4–5 feet with large, single pink, white, and crimson flowers — the benchmark garden cosmos. 'Purity' is a pure white single-flowered selection prized by flower farmers and brides for its elegant simplicity. 'Rubenza' offers deep ruby-red blooms that hold color better than most red cosmos in heat and fade gracefully to a warm rose. 'Double Click' series produces fully double, pompom-like flowers in a range of shades, a novelty departure from the typical single-flowered type.

Where to Grow Cosmos

Cosmos can be grown in 350 cities across 7 regions worldwide

🌍

Europe

80 cities
🌏

Asia

79 cities
🌎

North America

78 cities
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Africa

39 cities
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South America

39 cities
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Oceania

19 cities
🕌

Middle East

16 cities

🌍 Europe (80 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Aarhus, DK easy
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Amsterdam, NL easy
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Ankara, TR easy
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Antalya, TR easy
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Athens, GR easy
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Barcelona, ES easy
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Bari, IT easy
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Belgrade, RS easy
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Bergen, NO easy
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Berlin, DE easy
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Bilbao, ES easy
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Bologna, IT easy
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Bordeaux, FR easy
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Bratislava, SK easy
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Brussels, BE easy
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Bucharest, RO easy
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Budapest, HU easy
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Catania, IT easy
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Cologne, DE easy
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Copenhagen, DK easy
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Corfu, GR easy
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Cork, IE easy
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Dublin, IE easy
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Dubrovnik, HR easy
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Edinburgh, GB easy
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Florence, IT easy
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Frankfurt, DE easy
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Gdansk, PL easy
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Genoa, IT easy
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Glasgow, GB easy
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Gothenburg, SE easy
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Hamburg, DE easy
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Helsinki, FI easy
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Heraklion, GR easy
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Istanbul, TR easy
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Izmir, TR easy
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Krakow, PL easy
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Kyiv, UA easy
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Limassol, CY easy
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Lisbon, PT easy
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Ljubljana, SI easy
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London, GB easy
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Lyon, FR easy
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Madrid, ES easy
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Malaga, ES easy
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Marseille, FR easy
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Milan, IT easy
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Munich, DE easy
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Naples, IT easy
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Nice, FR easy
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Nicosia, CY easy
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Oslo, NO easy
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Palermo, IT easy
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Paris, FR easy
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Porto, PT easy
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Poznan, PL easy
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Prague, CZ easy
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Reykjavik, IS easy
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Riga, LV easy
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Rome, IT easy
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Seville, ES easy
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Sofia, BG easy
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Split, HR easy
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Stockholm, SE easy
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Strasbourg, FR easy
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Stuttgart, DE easy
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Tallinn, EE easy
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Thessaloniki, GR easy
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Tirana, AL easy
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Toulouse, FR easy
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Turin, IT easy
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Turku, FI easy
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Valencia, ES easy
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Valletta, MT easy
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Verona, IT easy
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Vienna, AT easy
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Vilnius, LT easy
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Warsaw, PL easy
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Zagreb, HR easy
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Zurich, CH easy
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🌏 Asia (79 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Ahmedabad, IN easy
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Almaty, KZ easy
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Bali, ID easy
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Bandung, ID easy
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Bangalore, IN easy
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Bangkok, TH easy
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Beijing, CN easy
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Busan, KR easy
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Cebu, PH easy
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Chandigarh, IN easy
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Chengdu, CN easy
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Chennai, IN easy
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Chiang Mai, TH easy
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Chittagong, BD easy
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Chongqing, CN easy
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Coimbatore, IN easy
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Colombo, LK easy
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Da Nang, VN easy
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Dalian, CN easy
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Davao, PH easy
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Delhi, IN easy
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Dhaka, BD easy
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Dharan, NP easy
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Fukuoka, JP easy
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Galle, LK easy
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Guangzhou, CN easy
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Hangzhou, CN easy
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Hanoi, VN easy
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Harbin, CN easy
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Ho Chi Minh City, VN easy
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Hong Kong, HK easy
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Hyderabad, IN easy
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Incheon, KR easy
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Indore, IN easy
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Islamabad, PK easy
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Jaipur, IN easy
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Jakarta, ID easy
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Jeju, KR easy
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Johor Bahru, MY easy
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Karachi, PK easy
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Kathmandu, NP easy
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Kochi, IN easy
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Kolkata, IN easy
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Kuala Lumpur, MY easy
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Kunming, CN easy
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Kyoto, JP easy
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Lahore, PK easy
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Lucknow, IN easy
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Manila, PH easy
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Mumbai, IN easy
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Nagoya, JP easy
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Nanjing, CN easy
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Nha Trang, VN easy
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Okinawa, JP easy
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Osaka, JP easy
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Pattaya, TH easy
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Penang, MY easy
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Phnom Penh, KH easy
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Pune, IN easy
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Sapporo, JP easy
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Seoul, KR easy
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Shanghai, CN easy
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Shenzhen, CN easy
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Siem Reap, KH easy
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Singapore, SG easy
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Surabaya, ID easy
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Surat, IN easy
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Taipei, TW easy
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Tashkent, UZ easy
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Tbilisi, GE easy
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Tokyo, JP easy
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Ulaanbaatar, MN easy
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Varanasi, IN easy
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Vientiane, LA easy
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Visakhapatnam, IN easy
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Wuhan, CN easy
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Xi'an, CN easy
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Xiamen, CN easy
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Yangon, MM easy
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🌎 North America (78 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Albuquerque, US easy
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Anchorage, US easy
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Atlanta, US easy
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Austin, US easy
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Baltimore, US easy
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Baton Rouge, US easy
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Boise, US easy
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Boston, US easy
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Bridgetown, BB easy
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Buffalo, US easy
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Calgary, CA easy
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Cancun, MX easy
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Charleston, US easy
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Charlotte, US easy
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Chattanooga, US easy
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Chicago, US easy
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Denver, US easy
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Des Moines, US easy
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Detroit, US easy
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Edmonton, CA easy
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El Paso, US easy
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Fargo, US easy
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Fresno, US easy
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Guadalajara, MX easy
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Halifax, CA easy
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Hartford, US easy
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Havana, CU easy
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Honolulu, US easy
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Houston, US easy
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Jacksonville, US easy
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Kansas City, US easy
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Kingston, JM easy
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Knoxville, US easy
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Las Vegas, US easy
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Little Rock, US easy
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Los Angeles, US easy
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Louisville, US easy
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Lubbock, US easy
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Madison, US easy
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Memphis, US easy
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Mexico City, MX easy
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Miami, US easy
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Milwaukee, US easy
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Minneapolis, US easy
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Monterrey, MX easy
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Montreal, CA easy
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Nashville, US easy
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New Orleans, US easy
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New York, US easy
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Oaxaca, MX easy
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Oklahoma City, US easy
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Omaha, US easy
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Ottawa, CA easy
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Panama City, PA easy
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Phoenix, US easy
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Pittsburgh, US easy
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Portland, US easy
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Puebla, MX easy
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Quebec City, CA easy
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Raleigh, US easy
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Richmond, US easy
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Sacramento, US easy
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Salt Lake City, US easy
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San Diego, US easy
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San Francisco, US easy
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San Jose, CR easy
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Santo Domingo, DO easy
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Saskatoon, CA easy
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Savannah, US easy
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Seattle, US easy
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Spokane, US easy
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St. Louis, US easy
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Tampa, US easy
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Toronto, CA easy
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Tucson, US easy
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Vancouver, CA easy
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Victoria, CA easy
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Winnipeg, CA easy
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🌍 Africa (39 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Abidjan, CI easy
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Accra, GH easy
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Addis Ababa, ET easy
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Algiers, DZ easy
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Antananarivo, MG easy
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Arusha, TZ easy
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Bamako, ML easy
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Bloemfontein, ZA easy
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Cairo, EG easy
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Cape Town, ZA easy
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Casablanca, MA easy
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Dakar, SN easy
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Dar es Salaam, TZ easy
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Douala, CM easy
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Durban, ZA easy
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Entebbe, UG easy
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Fez, MA easy
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Freetown, SL easy
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Harare, ZW easy
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Johannesburg, ZA easy
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Kampala, UG easy
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Kigali, RW easy
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Kinshasa, CD easy
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Lagos, NG easy
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Libreville, GA easy
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Lilongwe, MW easy
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Lome, TG easy
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Luanda, AO easy
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Lusaka, ZM easy
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Maputo, MZ easy
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Marrakech, MA easy
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Mombasa, KE easy
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Nairobi, KE easy
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Ouagadougou, BF easy
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Port Louis, MU easy
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Pretoria, ZA easy
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Tunis, TN easy
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Windhoek, NA easy
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Zanzibar, TZ easy
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🌎 South America (39 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Arequipa, PE easy
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Asuncion, PY easy
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Barranquilla, CO easy
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Belem, BR easy
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Bogota, CO easy
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Brasilia, BR easy
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Buenos Aires, AR easy
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Cali, CO easy
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Campinas, BR easy
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Caracas, VE easy
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Cartagena, CO easy
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Concepcion, CL easy
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Cordoba, AR easy
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Curitiba, BR easy
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Cusco, PE easy
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Fortaleza, BR easy
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Georgetown, GY easy
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Goiania, BR easy
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Guayaquil, EC easy
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La Paz, BO easy
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Lima, PE easy
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Manaus, BR easy
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Medellin, CO easy
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Mendoza, AR easy
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Montevideo, UY easy
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Paramaribo, SR easy
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Port of Spain, TT easy
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Porto Alegre, BR easy
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Quito, EC easy
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Recife, BR easy
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Rio de Janeiro, BR easy
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Rosario, AR easy
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Salvador, BR easy
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Santa Cruz, BO easy
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Santiago, CL easy
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Sao Paulo, BR easy
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Sucre, BO easy
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Trujillo, PE easy
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Valparaiso, CL easy
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🌊 Oceania (19 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Adelaide, AU easy
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Alice Springs, AU easy
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Auckland, NZ easy
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Brisbane, AU easy
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Cairns, AU easy
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Canberra, AU easy
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Christchurch, NZ easy
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Darwin, AU easy
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Dunedin, NZ easy
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Gold Coast, AU easy
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Hamilton, NZ easy
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Hobart, AU easy
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Melbourne, AU easy
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Noumea, NC easy
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Perth, AU easy
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Suva, FJ easy
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Sydney, AU easy
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Townsville, AU easy
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Wellington, NZ easy
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🕌 Middle East (16 cities)

City Level JanFebMarAprMayJunJulAugSepOctNovDec
Abu Dhabi, AE easy
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Amman, JO easy
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Baghdad, IQ easy
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Beirut, LB easy
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Doha, QA easy
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Dubai, AE easy
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Erbil, IQ easy
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Jeddah, SA easy
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Kuwait City, KW easy
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Manama, BH easy
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Muscat, OM easy
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Riyadh, SA easy
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Sana'a, YE easy
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Tabriz, IR easy
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Tehran, IR easy
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Tel Aviv, IL easy
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When should I plant cosmos in my city?

The best time to plant cosmos depends on your local climate zone. It thrives in temperatures between 15°C and 28°C. Wait until after the last frost in your area. Check your city's planting calendar on GrowByCity for exact dates.

Can I grow cosmos in winter?

Cosmos is not frost tolerant and cannot survive winter outdoors in most temperate climates. In tropical areas (USDA Zones 10+), it may grow year-round.

Get Cosmos Seeds & Plants

Ready to start growing? Find Cosmos seeds and starter plants online.

Shop on Burpee Search on Amazon

People Also Search For

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Similar Growing Requirements

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Zucchini

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18-27°C

Frequently Asked Questions about Cosmos

When should I plant cosmos?

The best time to plant cosmos depends on your local climate. Cosmos grows best in temperatures between 15°C and 28°C (can tolerate 5°C to 35°C). Cosmos is not frost tolerant, so wait until after the last frost in your area. Check your city's planting calendar on GrowByCity for exact planting months.

Can cosmos grow in tropical climates?

Yes! Cosmos can grow in tropical climates. It's successfully grown in tropical cities like Abidjan, Abu Dhabi, Accra. Cosmos requires full sun and low watering.

How long does cosmos take to grow?

Cosmos typically takes 50-60 days from planting to harvest. It requires full sun and low watering. Direct sow. Thrives on neglect -- don't fertilize. Wait until soil warms to at least 15°C before transplanting outdoors — cold soil stunts growth and can invite root rot. Overwatering is the most common mistake. Let soil dry out between waterings and ensure drainage is excellent.

Find the Best Time to Plant Cosmos

See the planting calendar for Cosmos in these popular cities:

London, GBMumbai, INNew York, USParis, FRSingapore, SGSydney, AUTokyo, JPToronto, CA

Last updated: March 2026 · Climate data from NOAA, FAO, USDA

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