Sowplot

Sowplot is a free seed starting calendar and guide library for US gardeners. You enter your last frost date, and the calendar builds a sowing schedule for fourteen common crops. The schedule is shown as a range, since indoor start times depend on your setup. Alongside the tool, twelve plain guides cover the decisions and problems that follow: seed trays and alternatives, seed starting mix, soil blockers, light, watering, seedling fertilizer, hardening off, leggy seedlings, damping off, tomato seedlings, pepper seedlings, cold frames, and supplies. The site says the frost date matters more than a calendar month because indoor timing counts back from the average last spring frost where you garden. Affiliate links are marked as sponsored.