Kohl Rabi - Olivia F1 This is a high quality hybrid variety with upright leaves which has superb tolerance of mildew and other fungal diseases. It is very versatile as can be sown for autumn harvest as well as spring-summer and as mini-veg. Sow outdoors thinly from March to July, where they are to crop, 1.5cm deep, directly into finely-prepared, well-drained soil, which has already been watered. Allow 30cm between rows. Seedlings usually appear in 7-21 days. Thin out to 15cm apart. Water well until plants are established. Or sow indoors for earlier crops, February-April, 0.5cm deep, in a tray of compost. Water well and place in a cold frame or unheated greenhouse. Keep moist. Transplant 5cm apart to other trays, when large enough to handle. Gradually accustom young plants to outside conditions before planting out, from May to June, 15cm apart into well-drained soil. Harvest from June to October.