Growing Onion in Phnom Penh
🇰🇭 Zone 13 Planting Guide · Tropical savanna climate
Quick Answer: Growing Onion in Phnom Penh
Yes, you can grow Onion in Phnom Penh, KH! Plant during Nov, Dec, Jan, Feb for best results. Phnom Penh is in USDA Zone 13 with a Tropical savanna climate, offering 365 frost-free days per year. The difficulty level is medium, and Onion takes 90-120 days to harvest. Onion needs full sun and regular watering.
Climate Match Analysis
Phnom Penh's climate requires careful timing. Summer highs (35°C) exceed Onion's maximum (30°C), so plant early or provide shade. Follow the recommended planting months for success.
Phnom Penh Climate Data
Onion Planting Calendar for Phnom Penh
Green months show the best time to plant Onion in Phnom Penh
Onion Growing Requirements
Sunlight
Full Sun
6+ hours direct sunlight
Water
Regular
Consistent moisture, 1-2 inches/week
Days to Harvest
90-120
From planting to first harvest
Difficulty
Some experience helpful
💡 Growing Tips for Onion
Day length triggers bulbing -- choose variety appropriate for your latitude. Can be planted 2-3 weeks before the last expected frost in your area, giving it a head start on the growing season. Can be planted 2-3 weeks before the last expected frost, giving it a head start on the growing season. Aim for about 2.5 cm of water per week, adjusting for rainfall. Organic mulch around the base helps maintain even moisture.
Frost tolerance: Onion is frost tolerant — you can plant earlier in spring.
Companion Plants for Onion
Find out which plants grow best alongside Onion — and which to keep apart
How to Grow Onion in Phnom Penh
Phnom Penh, KH is in USDA Hardiness Zone 13 with a Tropical savanna climate (Köppen Aw). With winter lows of 22°C and summer highs of 35°C, the growing season spans approximately 365 frost-free days. Onion grows well with some gardening knowledge in this climate.
Onion thrives in temperatures between 12°C and 24°C, requiring full sun and regular watering. In Phnom Penh, the best months to plant Onion are November, December, January, February. Since Onion can tolerate frost, you have flexibility to plant earlier in the season or extend into cooler months. Expect to harvest in approximately 90-120 days after planting.
Phnom Penh receives 1389mm of annual rainfall, which provides good natural moisture for Onion. Supplement with additional watering during dry spells.
Other Plants That Grow in Phnom Penh
More plants you can grow alongside Onion in Phnom Penh
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Frequently Asked Questions
Can I grow onion in Phnom Penh?
Yes! Onion can be successfully grown in Phnom Penh, KH. Phnom Penh is in USDA Hardiness Zone 13 with a Tropical savanna climate. The difficulty level for growing Onion here is rated "medium". The best months to plant are November, December, January, February.
When should I plant onion in Phnom Penh?
In Phnom Penh, the recommended planting months for Onion are November, December, January, February. Phnom Penh has 365 frost-free days per year, with winter lows of 22°C and summer highs of 35°C. Onion is frost tolerant, giving you more flexibility with planting dates.
How long does onion take to grow in Phnom Penh?
Onion typically takes 90-120 days from planting to harvest. In Phnom Penh's Tropical savanna climate with 365 frost-free days, you have plenty of time to grow Onion to maturity. Day length triggers bulbing -- choose variety appropriate for your latitude. Can be planted 2-3 weeks before the last expected frost in your area, giving it a head start on the growing season. Can be planted 2-3 weeks before the last expected frost, giving it a head start on the growing season. Aim for about 2.5 cm of water per week, adjusting for rainfall. Organic mulch around the base helps maintain even moisture.
Can I grow onion indoors in Phnom Penh?
Onion can potentially be grown indoors in Phnom Penh with proper conditions. It requires full sun (6+ hours of direct light — a south-facing window or grow lights recommended). Indoor growing extends your season beyond the Nov, Dec, Jan, Feb outdoor planting window. Use containers with good drainage and regular watering.
What month do I plant onion in Phnom Penh?
Plant Onion in Phnom Penh during November, December, January, February. These are the optimal months based on Phnom Penh's USDA Zone 13 climate, 365 frost-free days, and temperature range of 22°C to 35°C.
Is onion hard to grow in Phnom Penh?
Onion is rated "medium" to grow in Phnom Penh. Some gardening experience is helpful. Pay attention to watering schedules and planting timing. The climate match for Onion in Phnom Penh is Moderate.
What grows well with onion in Phnom Penh?
In Phnom Penh, you can grow many companion plants alongside Onion. Good options from the same planting window include Tomato, Basil, Lettuce, Carrot and 2 more. These plants share similar planting months and thrive in Phnom Penh's Zone 13 climate.
Does onion need full sun in Phnom Penh?
Onion requires full sun. In Phnom Penh, provide at least 6 hours of direct sunlight daily. During peak summer heat, some afternoon shade can help prevent heat stress.