Collard Greens
Also known as: Collards · Brassica oleracea var. viridis
3 types of collard greens
Champion
70 daysVates-type improvement — uniform, slow-bolting, dark green. Excellent for spring or fall sowings.
Georgia Southern
75 daysThe classic Southern heirloom — huge blue-green cabbage-flavored leaves on tall plants. Heat- and drought-tolerant.
Vates
68 daysCompact non-heading variety with tender waxy blue-green leaves. Slow to bolt, very cold-hardy — the winter standard.
When & where
Germination
Spacing & depth
How to plant
Transplant or direct-sow into deeply worked fertile soil. Harvest outer leaves from the bottom up — the plant keeps making new ones from the top like a mini palm tree. A hard frost turns starches to sugars; fall-harvested collards are unbeatably sweet.
Grower's tip
The most heat-tolerant cabbage-family green — a rare Southern brassica that shrugs off summer. Plants can top 3 ft and produce for a full year in mild climates.
Soil preferences
Rich, moisture-retentive loam.
6.0–7.0
Compost + a light nitrogen source (blood meal, aged manure) — greens are all leaf, so they want nitrogen.
Watering
Consistent — 1 in per week minimum, more in heat. Uneven water triggers bolt.
Overhead is fine in the morning; drip is best in humid climates.
Overwatered: soft rot at the crown, yellow lower leaves. Underwatered: bitter flavor, tough leaves, premature bolting.
Prefers top-watering — Top-water (overhead or rain) — grains are wind-pollinated and tolerate wet foliage. Water deeply and infrequently.
Temperature tolerance
55–75°F (13–24°C) — most greens bolt above 80°F (27°C)
45–60°F (7–16°C)
Light frost tolerated by most; kale, spinach, mâche, and collards are cold-hardy and often sweeter after frost.
Container growing
Yes — great in containers
6–8 in deep, any width; a window box works
Perfect for pots and hydroponics; cut-and-come-again mixes give weeks of harvest per sowing.
Succession planting
Every 2 weeks spring and fall. Skip the hottest weeks or use shade cloth.
Detailed harvesting
Cut outer leaves and let the crown keep producing (cut-and-come-again), or cut the whole rosette 1 in above the crown for a fresh flush.
Post-harvest storage & preservation
Rinse, spin dry, and store in a sealed bag with a paper towel in the crisper 5–7 days. Blanch and freeze for cooking greens.
Culinary, medicinal & other uses
Salads, sautés, smoothies, soups. Bitter or overgrown leaves are best cooked, not raw.
Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.
Seed saving
Lettuce is self-pollinating; spinach is wind-pollinated; brassica greens (kale, arugula, mustard) are insect-pollinated and cross freely.
Lettuce 20 ft; spinach 1/2 mile; brassicas 1/4 mile or cage.
Let a robust plant bolt; harvest dry seed stalks; rub clean; store dry.
Your zone's planting calendar
Pick your USDA hardiness zone and we'll estimate the key dates for collard greens in your area. These are regional averages — always check your own last-frost forecast before sowing.
From your kitchen — grow collard greens from what you already have
Let one plant bolt (send up its flower stalk) and it will make hundreds to thousands of seeds. Bolted greens are bitter to eat but perfect for saving.
- 1Pick your best, slowest-to-bolt plant as the seed parent.
- 2Let the flower stalk rise, bloom, and dry brown on the plant.
- 3Cut the whole stalk into a paper bag before it shatters.
- 4Rub between your hands to release seed; sieve out chaff; store dry.
Storage: 3–5 years dry.
My Collard Greens notes
Collard Greens seeds on hand
Track packets and loose seeds you already have. Private to your account.
Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.
Order more seeds
Running low? Reorder from one of these seed stores.
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