Direct sow kohlrabi seeds in 1cm deep drills 30cm apart from the end of February right through till August, thin to final spacing. Protect early sowings with fleece or cloches. Alternatively sow in modules and plant out to final spacing. Sow every two weeks for a continuous supply. Purple varieties are generally hardier and better suited to very early harvests.
Kohlrabi growing calendar
Kohlrabi is said to be the only common vegetable that originates in Northern Europe. It was first described in 1554 by a European botanist. ‘Kohlrabi’ is a German word; ‘Kohl’ meaning cabbage and ‘Rabi’ translating to turnip. It belongs to the mustard family (Brassicaceae) and are forms of the same species, Brassica oleracea, to which common cabbage, kale, broccoli, and cauliflower belong. They all came from a common parent, “wild cabbage”.