Brassica vegetables such as kohlrabi are ideally suited for growing in a northern climate — they are classified as cool-season vegetables. Kohlrabi
All young brassica seedlings can withstand a couple degrees of frost. For this reason, kohlrabi can be direct-seeded as early as the beginning of May. Seeds should be planted approximately one-centimetre deep and about 2.5-cm apart. Spacing between rows should be 30-45cm. Seedlings should emerge within one week.
To grow your own kohlrabi transplants, seed plants indoors approximately six weeks prior to transplanting out . Sow seeds in a commercial soilless media containing peatmoss, perlite and vermiculite. Soilless media provides a disease-free environment as well as excellent drainage to minimize root disease problems. Use flats, pots or containers with bottom drainage holes. At a soil or media temperature of 24°C, kohlrabi seeds will germinate in five or six days.
A common fungal disease that can infect developing brassica transplants is “damping off.” Symptoms include water-soaked stems that become constricted at the soil level. Plants wilt and eventually collapse. To prevent damping off, provide adequate air movement and light, avoid overwatering and crowding in young seedlings and transplants.
Mature kohlrabi plants range in height from 25 to 40cm. Kohlrabi is ready to harvest when the swollen above-ground stem reaches at least 7-8cm . Early in the harvest season, harvest alternate plants within the row to allow space for remaining roots to expand. Trim off the leaves close to the stem. The above-ground stem is the edible portion of the plant. The outer layer of the stem can be woody and tough. Peel these tough layers to expose soft, delicious flesh.
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