What if your earliest spring greens were already in the ground before Thanksgiving? That's the idea behind dormant seeding: you sow cold-hardy seeds in late fall, they sit quietly through winter, and they sprout on their own as soon as the soil wakes up in spring. In this guide I'll walk you through why it works, when to do it, which crops are worth trying, and how to give your seeds the best shot at coming up strong.
What is dormant seeding?
Dormant seeding means planting seeds when the soil is too cold for them to germinate. Instead of sprouting now and getting killed by a hard freeze, the seeds stay dormant until spring. Then, when the soil warms on its own schedule, they germinate right on time, often weeks before you could get out and work the soil yourself.
It's how a lot of plants reseed themselves in the wild. If you've ever had dill or cilantro pop up in a spot you didn't plant, you've already seen dormant seeding in action.
Why sow seeds in November?
Here in Minnesota (zone 5a), spring soil is often too wet and cold to work until well into April or May. Seeds that are already in place don't have to wait for you. A few other reasons I like it:
- Earlier harvests: Seedlings come up as soon as conditions allow, so you're picking greens sooner.
- Less spring rush: One bed is already planted before the busy season starts.
- Tougher seedlings: Plants that sprout in cool spring soil tend to be well adapted to it.
- A use for leftover seed: Half-used packets of cool-season crops are perfect for this.
When should you dormant seed?
Timing is the whole trick. Sow too early and a warm spell can trigger germination, and those tender sprouts won't survive the cold that follows. Sow too late and the ground is frozen solid.
The target is soil that stays below about 40°F but isn't frozen yet. A simple soil thermometer pushed in about 2 inches deep takes the guesswork out. Another good sign: daytime highs are holding in the 30s and the warm "bonus" days of fall seem to be behind you.
Cold-climate note: In zones 3 to 5, that window usually falls somewhere in mid-to-late November, after your first hard freeze but before the ground locks up. Watch your local forecast rather than the calendar. If you miss it, many gardeners in cold climates scatter seed right on top of frozen ground or thin snow in December or January, and it works surprisingly well.
In warmer zones (7 and up), dormant seeding isn't really necessary. You can simply grow these crops through the cool season.
Which seeds work best for dormant seeding?
Stick to cold-hardy, cool-season crops whose seed can handle freezing and thawing. Warm-season crops like tomatoes, beans, squash and peppers tend to rot in cold, wet soil, so save those for spring.
Here are the varieties I'd reach for:
- Cilantro (Coriander) (about 45 to 70 days): This is the classic choice. Cilantro loves cool weather and bolts fast in summer heat, so getting a head start in spring means more leafy harvests before it goes to seed. It's a must for fresh salsa, too.
- Dill, Bouquet (about 40 to 60 days for leaves): Dill reseeds itself readily, which tells you it doesn't mind a winter outdoors. Bouquet gives you feathery leaves for cooking and plenty of seed heads for pickling later in the season.
- Kale, Red Russian (about 50 to 60 days; baby leaves in about 25): Tender, flat, frilly leaves with purple stems and a mild, slightly sweet flavor. It's very cold-tolerant and makes great early-spring baby greens for salads.
- Lettuce, Black Seeded Simpson (about 45 days): A fast, loose-leaf lettuce with light green, crinkly leaves. It handles cool soil well and is one of the first salad crops you'll be cutting.
Spinach, arugula and parsnips are also good candidates if you have seed on hand.
How do you dormant seed a garden bed?
- Prep the bed now: While the soil is still workable, clear out spent plants and weeds and rake the surface smooth. If you want to be ready for a late sowing, cover the prepared bed with a board or tarp so it doesn't freeze as quickly.
- Stash some soil: Fill a bucket with potting mix or garden soil and keep it in the garage or shed. That way you'll have loose, unfrozen soil to cover your seeds even if the bed has started to firm up.
- Sow a little heavier: Some seed will be lost to winter, birds or rot, so plant about twice as thickly as you would in spring.
- Use normal depths: Lettuce goes about 1/8 to 1/4 inch deep, dill and kale about 1/4 inch, and cilantro about 1/4 to 1/2 inch. Firm the soil gently so the seeds make good contact.
- Mark your rows: Trust me, you won't remember in April! Use sturdy labels that won't blow away.
- Add a light cover: A thin layer of shredded leaves or straw helps keep seeds from washing away. Keep it light, and pull it back in early spring so the soil can warm.
What should you do in spring?
Once the snow melts, keep an eye on your rows. Seedlings usually appear when the soil warms into the 40s. A few care tips:
- Thin: Because you sowed heavily, thin seedlings to their normal spacing: about 4 to 6 inches for lettuce, 8 to 12 inches for kale, and 2 to 4 inches for cilantro and dill. Toss the thinnings into a salad!
- Fill gaps: Germination can be patchy. Simply reseed any bare spots once the soil is workable.
- Protect from hard frosts: Young seedlings are tough, but a row cover on a very cold night gives them extra insurance.
- Water: Spring soil is usually moist, but water if you get a dry stretch while seedlings are small.
Give it a try this fall
Dormant seeding is low effort and low risk, and the payoff is fresh greens weeks ahead of schedule. Pick one bed, choose a couple of cool-season crops, and watch for your soil to cool. Every packet I sell is packed by hand right here in-house, and all our seed is non-GMO and USA-grown, with free shipping on orders over $35 if you want to stock up before the ground freezes.