Growing Nasturtium in St. Louis
🇺🇸 Zone 4 Planting Guide · Humid subtropical climate
Quick Answer: Growing Nasturtium in St. Louis
Yes, you can grow Nasturtium 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 easy, and Nasturtium takes 35-52 days to harvest. Nasturtium needs full sun to partial shade and low watering.
Climate Match Analysis
St. Louis's climate requires careful timing. Winter lows (-6°C) drop below Nasturtium's minimum (5°C), so avoid cold months. Summer highs (32°C) exceed Nasturtium's maximum (30°C), so plant early or provide shade. Follow the recommended planting months for success.
St. Louis Climate Data
Nasturtium Planting Calendar for St. Louis
Green months show the best time to plant Nasturtium in St. Louis
Nasturtium Growing Requirements
Sunlight
Full Sun to Partial Shade
2-4 hours direct sunlight
Water
Low
Drought tolerant, water sparingly
Days to Harvest
35-52
From planting to first harvest
Difficulty
Great for beginners
💡 Growing Tips for Nasturtium
Poor soil produces more flowers. Seeds are large and easy for kids. 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.
Frost tolerance: Nasturtium is NOT frost tolerant — wait until after the last frost in St. Louis.
How to Grow Nasturtium 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. Nasturtium is one of the easiest plants to grow in this climate.
Nasturtium thrives in temperatures between 15°C and 25°C, requiring full sun to partial shade and low watering. In St. Louis, the best months to plant Nasturtium are April, May, June, July. Nasturtium is not frost tolerant, so it's important to wait until after the last spring frost before transplanting outdoors. Expect to harvest in approximately 35-52 days after planting.
St. Louis receives 1016mm of annual rainfall, which provides good natural moisture for Nasturtium. Be careful not to overwater — the natural rainfall may be sufficient.
Other Plants That Grow in St. Louis
More plants you can grow alongside Nasturtium in St. Louis
Keep Exploring
Frequently Asked Questions
Can I grow nasturtium in St. Louis?
Yes! Nasturtium 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 Nasturtium here is rated "easy". The best months to plant are April, May, June, July.
When should I plant nasturtium in St. Louis?
In St. Louis, the recommended planting months for Nasturtium 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 Nasturtium is not frost tolerant, make sure to plant after the last frost date.
How long does nasturtium take to grow in St. Louis?
Nasturtium typically takes 35-52 days from planting to harvest. In St. Louis's Humid subtropical climate with 210 frost-free days, you have plenty of time to grow Nasturtium to maturity. Poor soil produces more flowers. Seeds are large and easy for kids. 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.
Can I grow nasturtium indoors in St. Louis?
Nasturtium can potentially be grown indoors in St. Louis with proper conditions. It requires full sun to partial shade (2-4 hours of indirect light). Indoor growing extends your season beyond the Apr, May, Jun, Jul outdoor planting window. Use containers with good drainage and low watering.
What month do I plant nasturtium in St. Louis?
Plant Nasturtium 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 nasturtium hard to grow in St. Louis?
Nasturtium 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 Nasturtium in St. Louis is Moderate.
What grows well with nasturtium in St. Louis?
In St. Louis, you can grow many companion plants alongside Nasturtium. 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 nasturtium need full sun in St. Louis?
Nasturtium requires full sun to partial shade. Nasturtium tolerates lower light. In St. Louis, a spot with filtered or indirect light for 2-4 hours works well.