Collard Green Seeds – Brassica oleracea var. viridis
Brassica oleracea var. viridis • Brassicaceae (Cabbage) • Native to Eastern Mediterranean, Greece
Collard Green Seeds grow into leafy greens with broad, sturdy leaves and a rich garden flavor. A dependable choice for cool-season vegetable gardens, raised beds, containers, and home cooking.
Plant Name: Collard Green Seeds
Quantity: 100 Seeds
Selected: Collard Green Seeds / 100 Seeds
Germination depends on soil, temperature, moisture, and care. See our return policy for details.
At a glance
Watch closely for cabbage worms and aphids, particularly in late summer plantings, because brassica pests can move fast and strip young leaves before you realize the plants are under pressure.
Botanical profile
Meet the Collard Green – Brassica oleracea var. viridis
Step-by-step planting
Growing collard greens from seed is a straightforward process, but giving attention to timing, soil prep, and spacing will make the difference between a handful of leaves and a genuinely productive patch.
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1
Choose Your Timing
For a spring crop, direct sow collard green seeds outdoors 4 to 6 weeks before your last expected frost, or start transplants indoors 6 to 8 weeks ahead; for a fall and winter harvest, count back 60 to 80 days from your first expected hard frost and sow directly in the garden.
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2
Prepare Your Soil
Collards prefer a well-drained, fertile bed with a soil pH between 6.0 and 6.8, so work in a couple inches of compost and do a quick pH check before planting if your soil has not been amended recently.
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3
Sow Your Seeds
Press collard green seeds about a quarter inch deep into moist soil, spacing seeds roughly 3 inches apart if you plan to thin later, or 18 inches apart if you want to sow at final spacing from the start.
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4
Water Consistently
Keep the seedbed evenly moist but not waterlogged during collard green germination, aiming for soil that feels like a wrung-out sponge rather than muddy or bone dry.
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5
Thin and Transplant
Once seedlings reach 4 to 5 inches tall, thin them to stand 18 to 24 inches apart in rows spaced about 2 to 3 feet apart, giving each plant enough room to spread its wide leaves without crowding.
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6
Feed and Mulch
Side-dress plants with a nitrogen-rich fertilizer about 3 to 4 weeks after transplanting, and lay 2 to 3 inches of straw or shredded leaf mulch around the base to hold moisture and moderate soil temperature.
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Harvest Thoughtfully
Collard greens harvest time begins roughly 60 to 80 days from seeding, but you can start picking individual outer leaves once they are about the size of your hand, always leaving the central growing tip intact so the plant keeps producing.
Year-round care
Spring
- Sow after last frost
- prepare soil with compost
Summer
- Water regularly
- feed monthly
Fall
- Harvest before frost
- store well
Winter
- Rest
- store seeds cool and dry
Full specifications
Shipping
- Orders are delivered within 8 to 16 business days.
- All orders include tracking.
- Free shipping on all orders.
- Seeds are packed in moisture-resistant, resealable foil packets.
Germination
Germination rates vary depending on climate, soil conditions, and care. Seeds perform best when planted in the right season at the correct temperature, with consistent moisture and adequate light. We take quality seriously and each batch is tested before packaging. If you have concerns about your seeds, reach out and we will do our best to help.
Frequently asked
Questions about Collard Green Seeds – Brassica oleracea var. viridis
When is the best time to plant collard green seeds?
Timing depends heavily on your climate and which harvest window you are aiming for. In most of the country, collard greens planting guide advice points to two windows: early spring for a late spring crop, and midsummer for a fall and winter crop that will carry you through cold weather. Gardeners in USDA zones 8 through 11 can often grow collards nearly year-round, while those in zones 5 through 7 should focus on the fall planting window to take advantage of the sweetening effect of cool temperatures.
How deep should collard green seeds be sown?
A planting depth of about one quarter inch is right for most conditions. In very loose or sandy soil you might plant just a hair deeper to keep seeds from drying out too quickly, but going much deeper than half an inch can slow or prevent sprouting. Press the soil gently over the seeds after sowing to make sure there is good contact between seed and soil.
How long do collard greens take to germinate?
Collard green germination typically takes anywhere from 5 to 10 days under favorable conditions, with soil temperature being the most influential variable. Seeds germinate most reliably when soil sits between 60 and 85 degrees Fahrenheit, and you may see slower or uneven sprouting outside that range. Keep in mind that germination depends on a combination of climate, moisture, soil quality, and care, so results will vary from garden to garden.
Can collard greens survive frost?
Collards are among the cold-hardiest leafy greens you can grow, and established plants can handle temperatures down into the mid-20s Fahrenheit without serious damage. A light frost actually improves flavor by prompting the plant to convert starches into sugars. In regions with USDA zones 7 and warmer, collards will often overwinter with little protection, while gardeners in colder zones can extend the season significantly with row cover or a low tunnel.
Are collard greens safe for pets?
Collard greens are not toxic to dogs or cats, and small amounts are generally considered harmless. That said, large quantities can cause digestive upset in pets, particularly gas or loose stools, because of the fiber and sulfur compounds present in all brassicas. If you have curious animals in your garden, the bigger practical concern is protecting your plants from being nibbled down rather than any serious safety risk to the pet.
Can I grow collard greens in containers?
Container collard greens are very doable as long as you choose a pot with enough volume. A container holding at least 5 gallons per plant works well, and one large 15 to 20 gallon tub can support two or three plants comfortably. Use a quality potting mix rather than garden soil, water more frequently than you would in-ground since containers dry out faster, and plan to fertilize every few weeks because nutrients flush out with regular watering.
Why do collard greens taste sweeter after frost?
When temperatures drop, collard plants respond to the cold stress by converting stored starches into simple sugars, which acts as a kind of natural antifreeze in the leaf tissue. This is a genuine physiological change, not just a food lore myth, and it is one of the main reasons experienced gardeners in cooler climates actually prefer fall-harvested collards over spring ones. A few nights in the 28 to 35 degree Fahrenheit range is usually enough to notice the difference in flavor.