Growing Kohlrabi in Johannesburg
🇿🇦 Zone 7 Planting Guide · Subtropical highland climate
Quick Answer: Growing Kohlrabi in Johannesburg
Yes, you can grow Kohlrabi in Johannesburg, ZA! Plant during Apr, May, Jun, Jul, Aug 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 medium, and Kohlrabi takes 45-60 days to harvest. Kohlrabi needs full sun and regular watering.
Climate Match Analysis
Johannesburg's climate requires careful timing. Summer highs (26°C) exceed Kohlrabi's maximum (24°C), so plant early or provide shade. Follow the recommended planting months for success.
Johannesburg Climate Data
Kohlrabi Planting Calendar for Johannesburg
Green months show the best time to plant Kohlrabi in Johannesburg
Kohlrabi Growing Requirements
Sunlight
Full Sun
6+ hours direct sunlight
Water
Regular
Consistent moisture, 1-2 inches/week
Days to Harvest
45-60
From planting to first harvest
Difficulty
Some experience helpful
💡 Growing Tips for Kohlrabi
Harvest when tennis-ball sized. Larger ones become woody. 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: Kohlrabi is frost tolerant — you can plant earlier in spring.
How to Grow Kohlrabi 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. Kohlrabi grows well with some gardening knowledge in this climate.
Kohlrabi thrives in temperatures between 10°C and 20°C, requiring full sun and regular watering. In Johannesburg, the best months to plant Kohlrabi are April, May, June, July, August. Since Kohlrabi can tolerate frost, you have flexibility to plant earlier in the season or extend into cooler months. Expect to harvest in approximately 45-60 days after planting.
With 713mm of annual rainfall, Johannesburg provides moderate natural moisture. You'll likely need to supplement with regular watering, especially during the growing season.
Other Plants That Grow in Johannesburg
More plants you can grow alongside Kohlrabi in Johannesburg
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Frequently Asked Questions
Can I grow kohlrabi in Johannesburg?
Yes! Kohlrabi can be successfully grown in Johannesburg, ZA. Johannesburg is in USDA Hardiness Zone 7 with a Subtropical highland climate. The difficulty level for growing Kohlrabi here is rated "medium". The best months to plant are April, May, June, July, August.
When should I plant kohlrabi in Johannesburg?
In Johannesburg, the recommended planting months for Kohlrabi are April, May, June, July, August. Johannesburg has 290 frost-free days per year, with winter lows of 4°C and summer highs of 26°C. Kohlrabi is frost tolerant, giving you more flexibility with planting dates.
How long does kohlrabi take to grow in Johannesburg?
Kohlrabi typically takes 45-60 days from planting to harvest. In Johannesburg's Subtropical highland climate with 290 frost-free days, you have plenty of time to grow Kohlrabi to maturity. Harvest when tennis-ball sized. Larger ones become woody. 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 kohlrabi indoors in Johannesburg?
Kohlrabi can potentially be grown indoors in Johannesburg 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, Aug outdoor planting window. Use containers with good drainage and regular watering.
What month do I plant kohlrabi in Johannesburg?
Plant Kohlrabi in Johannesburg during April, May, June, July, August. 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 kohlrabi hard to grow in Johannesburg?
Kohlrabi is rated "medium" to grow in Johannesburg. Some gardening experience is helpful. Pay attention to watering schedules and planting timing. The climate match for Kohlrabi in Johannesburg is Moderate.
What grows well with kohlrabi in Johannesburg?
In Johannesburg, you can grow many companion plants alongside Kohlrabi. 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 kohlrabi need full sun in Johannesburg?
Kohlrabi requires full sun. In Johannesburg, provide at least 6 hours of direct sunlight daily. Most garden locations with southern exposure will work well.