This year I put in trials of leeks and kohlrabi. The leeks include more than 20 cultivars, some from North American sources, but many from European sources, where leeks are a more important crop in the produce industry. These cultivars were grown out as transplants in 200 cell Pro-Trays in our greenhouse. They were in greenhouse production for about 12 weeks. After a field site was prepared the transplants were set by hand in single row plots with 30 plants in each row.
Drip irrigation is provided to maximize growth.
As plants size up they will be hilled to provide blanching for the main stem, the edible portion of leeks. The kohlrabi trial is less extensive with only 6 cultivars included. They were also grown as transplants in the greenhouse and were transplanted by machine in late June. A second planting has been seeded in the greenhouse. Twin row plots were set in the field with 30 plants per plot.