Step 2: Select a Quality Seed-Starting Medium Seeds need a clean, lightweight growing medium that supports germination without overwhelming young roots. Espoma Organic Seed Starter, Mosser Lee SucSeed, HDI Root Riot, and Jiffy-7® Pellets are all trusted options. Espoma’s organic mix is airy and enriched with beneficial microbes that encourage strong early growth. Mosser Lee SucSeed provides a sterile, finely textured medium that promotes excellent seed-to-soil contact and reduces disease risk. HDI Root Riot cubes are pre-moistened plugs that promote rapid root development. Jiffy-7® Pellets expand with water to create the perfect growing environment, offering consistent moisture, excellent aeration, and minimal transplant shock making them ideal for beginners and seasoned gardeners alike.