Growing Nasturtium in Johannesburg
🇿🇦 Zone 7 Planting Guide · Subtropical highland climate
Quick Answer: Growing Nasturtium in Johannesburg
Yes, you can grow Nasturtium in Johannesburg, ZA! Plant during Aug, Sep, Oct, Nov for best results. Johannesburg is in USDA Zone 7 with a Subtropical highland climate, offering 290 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
Johannesburg's climate requires careful timing. Winter lows (4°C) drop below Nasturtium's minimum (5°C), so avoid cold months. Follow the recommended planting months for success.
Johannesburg Climate Data
Nasturtium Planting Calendar for Johannesburg
Green months show the best time to plant Nasturtium in Johannesburg
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 Johannesburg.
How to Grow Nasturtium in Johannesburg
Johannesburg, ZA is in USDA Hardiness Zone 7 with a Subtropical highland climate (Köppen Cwb). With winter lows of 4°C and summer highs of 26°C, the growing season spans approximately 290 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 Johannesburg, the best months to plant Nasturtium are August, September, October, November. 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.
With 713mm of annual rainfall, Johannesburg provides moderate natural moisture. This should be adequate for Nasturtium's water needs.
Other Plants That Grow in Johannesburg
More plants you can grow alongside Nasturtium in Johannesburg
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Frequently Asked Questions
Can I grow nasturtium in Johannesburg?
Yes! Nasturtium can be successfully grown in Johannesburg, ZA. Johannesburg is in USDA Hardiness Zone 7 with a Subtropical highland climate. The difficulty level for growing Nasturtium here is rated "easy". The best months to plant are August, September, October, November.
When should I plant nasturtium in Johannesburg?
In Johannesburg, the recommended planting months for Nasturtium are August, September, October, November. Johannesburg has 290 frost-free days per year, with winter lows of 4°C and summer highs of 26°C. Since Nasturtium is not frost tolerant, make sure to plant after the last frost date.
How long does nasturtium take to grow in Johannesburg?
Nasturtium typically takes 35-52 days from planting to harvest. In Johannesburg's Subtropical highland climate with 290 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 Johannesburg?
Nasturtium can potentially be grown indoors in Johannesburg with proper conditions. It requires full sun to partial shade (2-4 hours of indirect light). Indoor growing extends your season beyond the Aug, Sep, Oct, Nov outdoor planting window. Use containers with good drainage and low watering.
What month do I plant nasturtium in Johannesburg?
Plant Nasturtium in Johannesburg during August, September, October, November. These are the optimal months based on Johannesburg's USDA Zone 7 climate, 290 frost-free days, and temperature range of 4°C to 26°C.
Is nasturtium hard to grow in Johannesburg?
Nasturtium is rated "easy" to grow in Johannesburg. This is a great choice for beginners — it is forgiving and adapts well to this climate. The climate match for Nasturtium in Johannesburg is Moderate.
What grows well with nasturtium in Johannesburg?
In Johannesburg, 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 Johannesburg's Zone 7 climate.
Does nasturtium need full sun in Johannesburg?
Nasturtium requires full sun to partial shade. Nasturtium tolerates lower light. In Johannesburg, a spot with filtered or indirect light for 2-4 hours works well.