Kohlrabi Growing Guide Crop Rotation Group Brassicas (Cabbage family) ● Soil Well drained soil amended with well rotted compost. Position Full sun. Frost tolerant Yes, tolerates light frosts. Feeding In lean soil, mix in a balanced organic fertilizer before planting. Spacing Single Plants: 9" (25cm) each way (minimum) Rows: 7" (20cm) with 11" (30cm) row gap (minimum) Sow and Plant Sow in early spring indoors, or outdoors when the weather is warm but the soil is still cool. Our Garden Planner can produce a personalized calendar of when to sow, plant and harvest for your area. Notes Easier to grow than broccoli, especially in spring. Can be sown in late summer for a fall crops. Harvesting Pull plants when swollen stems are the size of tennis balls. Older plants have inferior texture. Troubleshooting Cabbageworms can be damaging, but they are less attracted to kohlrabi compared to other cabbage family crops. Planting and Harvesting Calendar < Back to All Plants Pests which Affect Kohlrabi Aphids (General) Cabbage Worm Diamondback Moth Slug Snail Plant Diseases which Affect Kohlrabi Brassica Alternaria Leaf Spot Brassica Downy Mildew