A Foolproof Seed-Starting System: Grow Lights, Heat Mats, and Step-by-Step Success

Summer vegetable seeds (tomatoes, peppers) need warm soil to germinate and light to grow. The compact Green Thumb Grow Light System ($90) delivers both: two 4-ft fluorescent lights on a stand, holding two flats of 2-inch cells (100 seedlings). Two heating mats ($23 each) keep soil 15–20°F above room temp. Sow seeds in pairs per cell for insurance.

"Best results I've had—didn't lose a single plant from seedling to harvest."

Source: Hydrofarm (800-634-9990, www.hydrofarm.com). Free catalog.

Step-by-Step

1. Wet chopstick tip, touch two dry seeds, poke into soil, twist to release. Sow ~¼″ deep; cover, firm. Water flats; keep moist. Turn on heat mats until transplant.
2. When seedlings break surface, turn on lights. Hang low (~7″ above flats); run from breakfast to bedtime.
3. At 1–2″ tall, snip weaker seedling in each cell.
4. At two true-leaf sets, transplant. Option A: pot up to 4″ for sturdier stems. Option B: harden off—move flat outdoors to filtered sun, protected from cold nights. After 4 days, plant in ground. Protect against frost with hot caps/row covers. First ripe fruits ~2 months post-transplant.