Collard Greens
Brassica oleracea var. viridis
Start collard greens indoors 9 weeks before your last spring frost, then plant out 4 weeks before your last spring frost. Space plants 18 in (46 cm) apart.
Photo: el Buho nº30, CC BY-SA 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 70 days after planting out
Optimal Transplant
From seed- Plant out4 weeks before your last spring frost
- First harvestabout 70 days after planting out
Optimal Fall Direct Sow
From seed- Sow outdoors13 weeks before your first fall frost
- First harvestabout 70 days after sowing
Optimal Fall Transplant
From seed- Plant out13 weeks before your first fall frost
- First harvestabout 70 days after planting out
Growing collard greens
- Spacing in the row
- 18 in (46 cm)
- Between rows
- 30 in (76 cm)
- Planting depth
- 1/4-1/2 inch
- Sun
- Full Sun
- Life cycle
- Biennial
Feeding
- How often
- Every 3-4 weeks during active growth. Side-dress a nitrogen fertilizer 4-6 inches from the plants, starting about 3-4 weeks after planting, while you keep harvesting leaves.
Your collard greens, 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.