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What to plant in March in Zone 4b
Start indoors
Direct-sow
Choose supplies for your planting plan
Check the crop's sowing method first. Trays and seed-starting mix are for indoor starts; row cover can help protect outdoor seedlings. Reuse supplies you already have, and check product dimensions before ordering.
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Seed-starting traysBurpee SuperSeed 36-cell trayReusable cells that pop seedlings out with the roots intact at transplant time.See it on Amazon
Seed-starting mixEspoma Organic Seed StarterA fine, sterile mix so small seeds can push through and seedlings don't rot.See it on Amazon
Heat matVIVOSUN heat mat with thermostatWarm-season seeds sprout in days instead of weeks when the soil sits near 75–85°F.See it on Amazon
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Calendar computed 2026-09-28. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rules: UNH Extension, Johnny's, UGA Extension.