Kohlrabi
Brassica oleracea var. gongylodes
Start kohlrabi indoors 9 weeks before your last spring frost, then plant out 4 weeks before your last spring frost. Space plants 6 in (15 cm) apart.
Photo: Forest and Kim Starr, CC BY 2.0 · source
When to plant
Timed from your frost dates, so it holds wherever you garden. Give yours and every step below becomes a date.
Optimal Indoor Start
From seedRecommended- Start indoors9 weeks before your last spring frost
- Begin hardening off5 weeks before your last spring frost
- Plant out4 weeks before your last spring frost
- First harvestabout 55 days after planting out
Optimal Transplant
From seed- Plant out4 weeks before your last spring frost
- First harvestabout 55 days after planting out
Optimal Fall Direct Sow
From seed- Sow outdoorsabout 11 weeks before your first fall frost
- First harvestabout 55 days after sowing
Optimal Spring Direct Sow
From seed- Sow outdoors2 weeks before your last spring frost
- First harvestabout 55 days after sowing
Growing kohlrabi
- Spacing in the row
- 6 in (15 cm)
- Between rows
- 12 in (30 cm)
- Planting depth
- 1/4-1/2 inch
- Sun
- Full Sun
- Life cycle
- Biennial
Feeding
- How often
- At planting, then once at midseason. Side-dress with nitrogen when plants are about 4 inches tall; steady growth gives tender, sweet stems.
Your kohlrabi, planned to the day.
Canopy turns these timings into dates from your own frost data, places every plant at its spacing on your garden map, and tracks it all the way to harvest.