30/05/2026
Kohlrabi (Brassica oleracea var. gongylodes), in the mustard family, is the eccentric close relative to cabbage, broccoli, cauliflower, kale, Brussels sprouts, collard greens and Chinese broccoli. It’s a biennial vegetable, grown as an annual that produces a bulbous, enlarged stem, topped with upright thick leaves. Harvest the swollen stems when they are the size of a golf ball to a tennis ball, beyond which they can get woody. The leaves can be eaten like kale. The green varieties are sweetest, the purple are hardiest.
The purple-flushed globe has a texture similar to the sweet, crunchy heart of a broccoli stem, but has a sweeter flavour and can be eaten as a crisp raw in salads or slaws or cooked like turnip: roasted, stir-fried, steamed, pickled, grated into fritters or added to flatbreads.
Because kohlrabi grows quickly, planting seeds sequentially from March through July allows for a continuous harvest. Kohlrabi matures in about 60 days from seed, and 40 days started from transplants. Keep well watered so that it grows steadily. May and June is NOT the time to sow as plants maturing in the hot, dry weather tend to produce inedible woody bulbs. The good news is that sowings can resume from mid-July to mid-August for a winter harvest. If you want to intercrop kohlrabi with slower-growing, taller crops, opt for non-brassicas, to avoid attracting brassica pests. For example, planting kohlrabi with celery works well because kohlrabi forms its bulb above ground, avoiding direct root competition. In summer, grow with nasturtiums (which act as a "trap crop" drawing aphids away from your vegetables) and aromatic herbs like sage or thyme.