Growing Leek in St. Louis
🇺🇸 Zone 4 Planting Guide · Humid subtropical climate
Quick Answer: Growing Leek in St. Louis
Yes, you can grow Leek in St. Louis, US! Plant during Feb, Mar, Apr, Aug, Sep 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 Leek takes 90-120 days to harvest. Leek needs full sun and regular watering.
Climate Match Analysis
St. Louis's climate requires careful timing. Winter lows (-6°C) drop below Leek's minimum (-5°C), so avoid cold months. Summer highs (32°C) exceed Leek's maximum (25°C), so plant early or provide shade. Follow the recommended planting months for success.
St. Louis Climate Data
Leek Planting Calendar for St. Louis
Green months show the best time to plant Leek in St. Louis
Leek 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 Leek
Plant in trenches and hill soil as they grow to blanch stems. Very cold hardy. 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: Leek is frost tolerant — you can plant earlier in spring.
How to Grow Leek 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. Leek grows well with some gardening knowledge in this climate.
Leek thrives in temperatures between 10°C and 20°C, requiring full sun and regular watering. In St. Louis, the best months to plant Leek are February, March, April, August, September. Since Leek 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.
St. Louis receives 1016mm of annual rainfall, which provides good natural moisture for Leek. Supplement with additional watering during dry spells.
Other Plants That Grow in St. Louis
More plants you can grow alongside Leek in St. Louis
Keep Exploring
Frequently Asked Questions
Can I grow leek in St. Louis?
Yes! Leek 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 Leek here is rated "medium". The best months to plant are February, March, April, August, September.
When should I plant leek in St. Louis?
In St. Louis, the recommended planting months for Leek are February, March, April, August, September. St. Louis has 210 frost-free days per year, with winter lows of -6°C and summer highs of 32°C. Leek is frost tolerant, giving you more flexibility with planting dates.
How long does leek take to grow in St. Louis?
Leek 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 Leek to maturity. Plant in trenches and hill soil as they grow to blanch stems. Very cold hardy. 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 leek indoors in St. Louis?
Leek 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 Feb, Mar, Apr, Aug, Sep outdoor planting window. Use containers with good drainage and regular watering.
What month do I plant leek in St. Louis?
Plant Leek in St. Louis during February, March, April, August, September. 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 leek hard to grow in St. Louis?
Leek 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 Leek in St. Louis is Moderate.
What grows well with leek in St. Louis?
In St. Louis, you can grow many companion plants alongside Leek. 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 leek need full sun in St. Louis?
Leek requires full sun. In St. Louis, provide at least 6 hours of direct sunlight daily. Most garden locations with southern exposure will work well.