Growing Borage in St. Louis
🇺🇸 Zone 4 Planting Guide · Humid subtropical climate
Quick Answer: Growing Borage in St. Louis
Yes, you can grow Borage 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 easy, and Borage takes 50-60 days to harvest. Borage needs full sun and moderate watering.
Climate Match Analysis
St. Louis's climate requires careful timing. Winter lows (-6°C) drop below Borage's minimum (-5°C), so avoid cold months. Summer highs (32°C) exceed Borage's maximum (28°C), so plant early or provide shade. Follow the recommended planting months for success.
St. Louis Climate Data
Borage Planting Calendar for St. Louis
Green months show the best time to plant Borage in St. Louis
Borage Growing Requirements
Sunlight
Full Sun
6+ hours direct sunlight
Water
Moderate
Keep soil consistently moist
Days to Harvest
50-60
From planting to first harvest
Difficulty
Great for beginners
💡 Growing Tips for Borage
Self-seeds prolifically. Edible flowers for salads and drinks. Can be planted 2-3 weeks before the last expected frost, giving it a head start on the growing season. Water steadily but avoid soggy soil. A 5-cm layer of organic mulch helps balance moisture and suppress weeds.
Frost tolerance: Borage is frost tolerant — you can plant earlier in spring.
Companion Plants for Borage
Find out which plants grow best alongside Borage — and which to keep apart
How to Grow Borage 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. Borage is one of the easiest plants to grow in this climate.
Borage thrives in temperatures between 10°C and 22°C, requiring full sun and moderate watering. In St. Louis, the best months to plant Borage are February, March, April, August, September. Since Borage can tolerate frost, you have flexibility to plant earlier in the season or extend into cooler months. Expect to harvest in approximately 50-60 days after planting.
St. Louis receives 1016mm of annual rainfall, which provides good natural moisture for Borage. Monitor soil moisture and water as needed.
Other Plants That Grow in St. Louis
More plants you can grow alongside Borage in St. Louis
Keep Exploring
Frequently Asked Questions
Can I grow borage in St. Louis?
Yes! Borage 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 Borage here is rated "easy". The best months to plant are February, March, April, August, September.
When should I plant borage in St. Louis?
In St. Louis, the recommended planting months for Borage 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. Borage is frost tolerant, giving you more flexibility with planting dates.
How long does borage take to grow in St. Louis?
Borage typically takes 50-60 days from planting to harvest. In St. Louis's Humid subtropical climate with 210 frost-free days, you have plenty of time to grow Borage to maturity. Self-seeds prolifically. Edible flowers for salads and drinks. Can be planted 2-3 weeks before the last expected frost, giving it a head start on the growing season. Water steadily but avoid soggy soil. A 5-cm layer of organic mulch helps balance moisture and suppress weeds.
Can I grow borage indoors in St. Louis?
Borage 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 moderate watering.
What month do I plant borage in St. Louis?
Plant Borage 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 borage hard to grow in St. Louis?
Borage is rated "easy" to grow in St. Louis. This is a great choice for beginners — it is forgiving and adapts well to this climate. The climate match for Borage in St. Louis is Moderate.
What grows well with borage in St. Louis?
In St. Louis, you can grow many companion plants alongside Borage. 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 borage need full sun in St. Louis?
Borage requires full sun. In St. Louis, provide at least 6 hours of direct sunlight daily. Most garden locations with southern exposure will work well.