What you need are a heat mat, a plant light, and these seedling trays. The Seedling Trays Can Help You Start Seeding Easily and Efficiently. --Tray Size: 3.7 x 3.7 x 5.5 cm. Ordinary black trays are difficult to see if the roots of the plants are strong enough, so it is difficult to decide whether or not the seedlings should be transplanted.
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