Grand Duke Kohlrabi (F1 Hybrid 50 Days)
The Grand Duke Kohlrabi is the 1979 All America selection winner and still a favorite for both earliness and flavor. Kohlrabi is also called cabbage-turnip and appropriately so, the turnip-like balls are held cleanly above the ground with a cruciferous, “cabbagey” flavor. 4” globes are crisp and tender and Grand Duke holds well, meaning that you can leave it in the garden for a while without it becoming woody.
Brassica oleracea var. gongylodes
Germination: 7-10 days
Germination Temperature: Optimum soil temperatures 60-75ºF.
Seed Sowing Depth: 1/4" deep
Sowing Outdoors: Starting in spring when the soil temperature reaches 60 ºF. Sow seeds 1-2" apart, thin 3-8” apart. The larger the bulb size the more space. Sow in mid to late summer for fall harvest.
How much does a packet plant: 4-6 foot single row
Harvest: Bulbs from spring plantings under 2-3” for the most tender and sweet bulbs. Fall plantings can survive frosts and can be harvested when they are larger.
Tips: The Grand Duke Kohlrabi should be planted in fertile soil, and amended with compost before planting if needed. Grows best in the cooler weather of spring and late summer. Summer heat makes the bulbs woody and dry. Adequate moisture is needed for optimum growth.