Seeds & starts

I used to order from whoever had the prettiest catalog. Then I spent three summers wondering why the 'days to maturity' never matched reality. Turns out the seed was fine — it just wasn't bred for my climate. Your best seed source is almost never one company. It's a mix: a catalog for volume, a local nursery for the two or three things you don't want to baby indoors, and a swap or a neighbor for whatever's already proven itself down your street.

For heirlooms and regional stuff, Baker Creek Heirloom Seeds, Seed Savers Exchange, Southern Exposure Seed Exchange, and Fedco all do good work. If you're north and short-season, High Mowing Organic Seeds and Johnny's Selected Seeds run trials in Vermont and Maine, so their days-to-maturity numbers are honest for cold country. Native Seeds/SEARCH carries Indigenous and Southwest-adapted varieties you won't find anywhere else — worth a look even if you're not in the desert, because their drought tolerance work is just good genetics.

Don't sleep on the boring options. Feed and farm-supply stores stock regional favorites cheap, no shipping, no fuss. Seed libraries let you borrow for free and pay it back with saved seed later — most county library systems have one now. And a Master Gardener plant sale in May will hand you a tomato variety that's been surviving your county's blight and heat for a decade, for two bucks a start.

A seed packet is a tiny instruction manual that most people never actually read past the front. The front sells you the fantasy. The back has the number that matters: days to maturity. For direct-sown crops that's sowing to harvest. For anything transplanted — tomatoes, peppers, eggplant — it's transplant to harvest, so tack on another 5-8 weeks of indoor growing before that clock even starts.

Germination temperature is soil temperature, not air temperature, and that distinction has killed more spring plantings than frost has. Lettuce germinates fine at 40°F soil. Beans want 60-70°F minimum or they just rot in the ground before sprouting — I've dug up a whole row of mushy bean seed in cold May soil and learned that lesson the expensive way. Tomatoes and peppers like 70-85°F, which is why a heat mat under the tray matters more than any grow light. A $12 soil thermometer pays for itself the first spring you use it.

Seed count math matters more than gardeners think. A gram of lettuce seed is roughly 800-1,000 seeds; a gram of tomato seed is closer to 300; a gram of beans is maybe 3-5 seeds because they're huge. If a packet says 80% germination and 100 seeds, expect about 80 usable plants, sow 2-3 per hole, and thin hard. Thinning is not optional — crowded seedlings compete for light, get leggy, and rot at the base from poor airflow. Depth is non-negotiable too: bury a lettuce seed a half inch and it'll never see daylight, it just runs out of stored energy underground.

Open-pollinated means the plant is pollinated naturally — bees, wind, or itself — and its offspring look like the parent. Heirloom is a cultural label stacked on top of that: an open-pollinated variety passed down, usually 50+ years, often with a family or place name attached. 'Mortgage Lifter' has a story. So does 'Cherokee Purple.' The flavor can be extraordinary. The disease resistance often isn't, because nobody was breeding these for blight resistance in 1930.

Hybrid seed (F1) comes from deliberately crossing two distinct parent lines to combine their traits — vigor, uniformity, disease resistance. You can save hybrid seed, but the next generation won't breed true; it'll segregate back toward the grandparents in unpredictable ways. If seed saving is the point, stick to open-pollinated or heirloom.

GMO seed is engineered in a lab with genes from other species — this is real technology used in commodity corn, soy, and cotton, but it is essentially absent from home garden seed packets in the US. No company sells you GMO zucchini seed. If it matters to you anyway, look for the Safe Seed Pledge or Non-GMO Project label, but understand you're paying for a marketing reassurance on something that was already true.

Starting indoors buys you season length and lets you grow varieties no nursery stocks. The number one failure is light. A south window looks bright to your eyes but it's a fraction of what a seedling needs, and they'll stretch toward it, going thin and weak within a week. A basic LED or fluorescent shop light — $30 at a hardware store — hung 2-4 inches above the leaves and run 14-16 hours a day beats any window, full stop.

Use seed-starting mix, not garden soil and not straight potting soil either. Garden soil compacts in cells, may carry disease, and comes loaded with weed seed. Seed mix is light, sterile-ish, and holds even moisture. Bottom-water by setting trays in a shallow pan so you don't blast tiny seeds sideways, and hold off on fertilizer until the first true leaves show — the seed itself carries enough food until then.

Damping-off is the seedling killer nobody warns you about early enough: a fungal rot that collapses stems right at the soil line overnight, usually from overwatering, poor airflow, and cool soggy mix. Prevention beats cure — use fresh sterile mix, don't overwater, run a small fan for airflow, and don't crowd trays. Timing: tomatoes and peppers 6-8 weeks before last frost, brassicas and onions 8-10 weeks, squash and cucumbers only 3-4 weeks because they hate root disturbance and will sulk if held too long. Harden off before transplanting — an hour outside in shade the first day, building to a full day of sun and wind over 7-10 days, or you'll watch the leaves bleach and burn within hours of planting out.

Root crops especially resent transplanting: carrots, radishes, beets, and turnips grow a taproot that forks and stunts if disturbed even once, so they go straight into the ground or not at all. Beans, corn, squash, cucumbers, peas, and most greens also do fine or better sown directly — save your trays for the crops that actually need the head start.

Soil prep is the real lever. Loose, crumbly soil — the texture of chocolate cake crumbs, no clods — lets a hypocotyl push through without wasting energy. Clear rocks and thick mulch off the seedbed surface until plants are up and growing; mulch is for after emergence, not before. Press big seed like beans and squash firmly into contact with soil, but don't pack the surface into a crust or it'll seal against water and air both.

Go by soil temperature, and succession-sow instead of dumping the whole packet at once. Every 1-3 weeks, a smaller planting keeps lettuce and beans coming steadily instead of one glut you can't eat fast enough followed by three empty weeks. Mark rows clearly with a stake and string — I've hoed out an entire carrot row I forgot I planted, more than once.

Seed saving closes the loop. A plant grown and saved on your own ground adapts, generation over generation, to your specific soil, pests, and weather quirks. It also means you're not re-buying the same packet every spring. Start with self-pollinating crops that have big, easy seed: beans, peas, lettuce, and tomatoes forgive beginner mistakes.

Choose your seed parents deliberately — save from the earliest, healthiest, best-tasting plant in the row, never the runt that happened to have extra seed left over. Cross-pollinating crops need real isolation or hand-pollination: squash varieties will cross with each other within a quarter mile if bees are working both, corn crosses via wind over even longer distances, and brassicas (all of which are one species, Brassica oleracea, for cabbage/kale/broccoli/brussels sprouts) cross with abandon. Self-pollinators like beans and tomatoes need far less — a few feet of separation and maybe a floating row cover during flower if you're precise about purity.

Wet-seeded crops — tomatoes, cucumbers, melons — carry a gel sac around the seed that both inhibits germination and can harbor seed-borne disease, so they need fermentation. Scoop pulp and seed into a jar with a splash of water, let it sit 2-3 days at 70-80°F, stirring once daily; a layer of mold on top is normal and means it's working. Rinse in a strainer until the seed feels gritty clean, then dry on a coffee filter or screen, not paper towel which glues to the seed. Dry-seeded crops — beans, peas, lettuce, brassicas — just finish drying on the plant, then get shelled or threshed and dried further indoors. Either way, finished seed should snap when bent, not fold, before it goes in an airtight jar in a cool dark place. A spoonful of dry rice or a silica packet in the jar keeps ambient humidity from creeping in.