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Kohlrabi (Brassica oleracea var. gongylodes). They root shallowly, so make sure the kohlrabi get plenty of water during dry days. In June, kohlrabi can be sown in the open ground. Harvest in October; planted in a cold frame or greenhouse, you can still enjoy kohlrabi until November. Kohlrabi likes nutritious soil. Do not let above-ground tubers grow too large, as they will become very dry.
Bugs
Fungi & diseases
Brown spots with grey fungus: grey rot (Botrytis cinerea).
White fungal fluff on the underside of the leaves: Downy mildew (Peronosporaceae). It usually involves the lower leaves because the fungus get onto the leaf by splashing rain. In powdery mildew (a species of Ascomycete fungi), the fluff is on the top of the leaves.
Poor growth, plant wilting, swollen roots rotting away: Clubroot (Plasmodiophora brassicae).
Large yellow, withered spots on leaves, veins turn black, followed by stem rot: black rot (Xanthomonas campestris).
