Growing Amaranth in St. Louis
🇺🇸 Zone 4 Planting Guide · Humid subtropical climate
Quick Answer: Growing Amaranth in St. Louis
Yes, you can grow Amaranth in St. Louis, US! Plant during Apr, May, Jun, Jul for best results. St. Louis is in USDA Zone 4 with a Humid subtropical climate, offering 210 frost-free days per year. The difficulty level is medium, and Amaranth takes 90-120 days to harvest. Amaranth needs full sun and moderate watering.
Climate Match Analysis
St. Louis's climate requires careful timing. Winter lows (-6°C) drop below Amaranth's minimum (10°C), so avoid cold months. Follow the recommended planting months for success.
St. Louis Climate Data
Amaranth Planting Calendar for St. Louis
Green months show the best time to plant Amaranth in St. Louis
Amaranth Growing Requirements
Sunlight
Full Sun
6+ hours direct sunlight
Water
Moderate
Keep soil consistently moist
Days to Harvest
90-120
From planting to first harvest
Difficulty
Some experience helpful
💡 Growing Tips for Amaranth
Direct sow after last frost. Drought-tolerant once established. Wait until soil warms to at least 20°C before transplanting outdoors — cold soil stunts growth and can invite root rot. Water steadily but avoid soggy soil. A 5-cm layer of organic mulch helps balance moisture and suppress weeds.
Frost tolerance: Amaranth is NOT frost tolerant — wait until after the last frost in St. Louis.
How to Grow Amaranth in St. Louis
St. Louis, US is in USDA Hardiness Zone 4 with a Humid subtropical climate (Köppen Cfa). With winter lows of -6°C and summer highs of 32°C, the growing season spans approximately 210 frost-free days. Amaranth grows well with some gardening knowledge in this climate.
Amaranth thrives in temperatures between 20°C and 30°C, requiring full sun and moderate watering. In St. Louis, the best months to plant Amaranth are April, May, June, July. Amaranth is not frost tolerant, so it's important to wait until after the last spring frost before transplanting outdoors. Expect to harvest in approximately 90-120 days after planting.
St. Louis receives 1016mm of annual rainfall, which provides good natural moisture for Amaranth. Monitor soil moisture and water as needed.
Other Plants That Grow in St. Louis
More plants you can grow alongside Amaranth in St. Louis
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Frequently Asked Questions
Can I grow amaranth in St. Louis?
Yes! Amaranth can be successfully grown in St. Louis, US. St. Louis is in USDA Hardiness Zone 4 with a Humid subtropical climate. The difficulty level for growing Amaranth here is rated "medium". The best months to plant are April, May, June, July.
When should I plant amaranth in St. Louis?
In St. Louis, the recommended planting months for Amaranth are April, May, June, July. St. Louis has 210 frost-free days per year, with winter lows of -6°C and summer highs of 32°C. Since Amaranth is not frost tolerant, make sure to plant after the last frost date.
How long does amaranth take to grow in St. Louis?
Amaranth typically takes 90-120 days from planting to harvest. In St. Louis's Humid subtropical climate with 210 frost-free days, you have plenty of time to grow Amaranth to maturity. Direct sow after last frost. Drought-tolerant once established. Wait until soil warms to at least 20°C before transplanting outdoors — cold soil stunts growth and can invite root rot. Water steadily but avoid soggy soil. A 5-cm layer of organic mulch helps balance moisture and suppress weeds.
Can I grow amaranth indoors in St. Louis?
Amaranth can potentially be grown indoors in St. Louis 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 Apr, May, Jun, Jul outdoor planting window. Use containers with good drainage and moderate watering.
What month do I plant amaranth in St. Louis?
Plant Amaranth in St. Louis during April, May, June, July. These are the optimal months based on St. Louis's USDA Zone 4 climate, 210 frost-free days, and temperature range of -6°C to 32°C.
Is amaranth hard to grow in St. Louis?
Amaranth is rated "medium" to grow in St. Louis. Some gardening experience is helpful. Pay attention to watering schedules and planting timing. The climate match for Amaranth in St. Louis is Moderate.
What grows well with amaranth in St. Louis?
In St. Louis, you can grow many companion plants alongside Amaranth. Good options from the same planting window include Tomato, Basil, Lettuce, Carrot and 2 more. These plants share similar planting months and thrive in St. Louis's Zone 4 climate.
Does amaranth need full sun in St. Louis?
Amaranth requires full sun. In St. Louis, provide at least 6 hours of direct sunlight daily. Most garden locations with southern exposure will work well.