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Growing kohlrabi in cooler spring climates can be a rewarding experience for gardeners looking to diversify their vegetable garden. This hardy member of the cabbage family thrives in moderate temperatures and can be harvested in early to mid-spring.
Choosing the Right Varieties
There are several varieties of kohlrabi suitable for cooler climates. Look for early-maturing types such as ‘Purple Vienna’ or ‘White Vienna,’ which can be harvested within 50-60 days. These varieties tend to withstand cooler temperatures better and produce tender, sweet bulbs.
Planting Kohlrabi in Spring
Start seeds indoors 3-4 weeks before the last expected frost date. Use seed-starting trays with quality potting mix and keep them in a warm, bright location. Transplant seedlings outdoors once the soil warms to at least 45°F (7°C) and the risk of heavy frosts has passed.
If sowing directly into the garden, wait until the soil has warmed and is well-drained. Space seeds about 1 inch apart in rows that are 12-18 inches apart. Cover lightly with soil and water gently.
Growing Conditions and Care
Kohlrabi prefers full sun but can tolerate some light shade in very cold climates. Keep the soil consistently moist but not waterlogged. Adding organic compost before planting improves soil fertility and drainage.
Mulching around plants helps retain moisture and regulate soil temperature, especially important in cooler springs. Regularly check for weeds and remove them to reduce competition for nutrients.
Pest and Disease Management
Common pests include aphids, cabbage worms, and flea beetles. Use row covers to protect young plants and consider organic insecticides if infestations occur. Practice crop rotation and avoid planting kohlrabi in the same spot each year to prevent disease buildup.
Harvesting Kohlrabi
Harvest kohlrabi when the bulbs reach about 2-3 inches in diameter for the best flavor and tenderness. Use a sharp knife to cut the bulbs from the stem, leaving a small portion of the stem attached. Regular harvesting encourages new growth and prevents the bulbs from becoming woody.
Enjoy your fresh kohlrabi raw in salads, or cook it by steaming, roasting, or sautéing. Proper care in cooler spring climates ensures a healthy harvest and a delicious addition to your garden.