Collard greens (Brassica oleracea var. viridis) are one of the easiest and most dependable leafy greens you can grow. They handle both cool and warm weather, tolerate light frost, and keep producing big, tender leaves for weeks. This guide covers every step, from starting collard seeds in trays to transplanting, care, pest control and harvest. Shop collard greens seeds
Collard greens growing at a glance
- Botanical name: Brassica oleracea var. viridis
- Sun: 8–10 hours a day
- When to plant: Early spring for a late spring/summer harvest, or fall for a late fall/early winter crop
- Planting depth: 1/4 inch
- Germination: 5–7 days
- Ideal growing temperature: 45–85°F
- Plant spacing: 8 inches
- Frost hardy: Yes, tolerates light frost
- Growth habit: Leaves branch out from a central stem
When to Plant Collard Greens
Collard greens grow in two seasons. Transplant seedlings in early spring for a late spring and summer harvest, or in fall for a late fall and early winter crop. Because collards grow best at 45–85°F and tolerate light frost, fall plantings often produce the sweetest, most tender leaves.
How to Start Collard Seeds
- Sow seeds in seedling trays filled with seed starting mix.
- Plant seeds 1/4 inch deep.
- Keep the soil moist. Collard seeds sprout quickly, usually in 5–7 days.
- Give seedlings strong light so they grow sturdy and compact, ready for transplanting in about 4–6 weeks.
Best Soil and Spacing for Collard Greens
Transplant collards into well-drained, fertile soil rich in nitrogen, which fuels the large, leafy growth collards are grown for. Choose a spot with 8–10 hours of sun, and space plants 8 inches apart.
How to Water Collard Greens
Water collard greens regularly to keep the soil evenly moist. Steady moisture keeps the leaves tender and helps plants keep producing.
Controlling Aphids on Collard Greens
Aphids are the most common pest on collard greens, especially as temperatures rise. Check the undersides of the leaves often. Remove aphids with organic pest control methods, such as a strong spray of water, insecticidal soap or neem oil.
How to Harvest Collard Greens
Start harvesting once the leaves are large enough to use. Pick the lower, outer leaves first and leave the central growing tip in place, so the plant keeps producing new leaves from the top for weeks.
Collard Greens Growing FAQ
How long do collard seeds take to germinate?
Collard seeds usually sprout in 5–7 days.
How deep should I plant collard seeds?
Plant them about 1/4 inch deep.
How far apart should collard greens be planted?
Space collard plants about 8 inches apart.
Can collard greens survive frost?
Yes. Collards tolerate light frost, which makes them a great fall and early winter crop.
When is the best time to plant collard greens?
Plant in early spring for a late spring and summer harvest, or in fall for a late fall and early winter crop.
How do I get rid of aphids on collard greens?
Spray them off with water, or use an organic option such as insecticidal soap or neem oil. Check plants often, especially in warm weather.