Starting thousands of seeds indoors? It's a rewarding obsession—but success hinges on the right setup. Here's a streamlined system honed from years of trial and error.
Start most seeds 6–8 weeks before your last frost. Seedlings need 14 hours of strong light daily, plus 8 hours of darkness. Fluorescent shop lights work perfectly—pair one cool-white and one warm-white bulb to mimic natural spectrum. Keep lights just 3 inches above seedlings to prevent legginess.
Cover freshly sown trays with a humidity dome. Remove it immediately once sprouts appear to prevent damping-off—a fatal fungal disease caused by stagnant air and non-sterile soil. Always use sterile, soilless seed-starting mix.
After the second set of leaves appears, feed with diluted fish/seaweed emulsion (avoid high-nitrogen synthetics). When seedlings outgrow cells, pot them up. Harden off gradually over 10 days before planting outdoors.
The New Seed-Starters Handbook by Nancy Bubel is the gold-standard reference—worth every penny.
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