Organic Seed Finder

Last frost 20 Apr. Sow Freshly pulled radishes next.

Click the date and put in yours. Everything below is counted from it: when to start seed indoors, plant out and sow outdoors, with the germination temperature, depth and days for 93 plants.

Open the sowing calendar Search the seed database

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    See the whole season

    Botanical plate of a tomato plant with flowers and a ribbed fruit
    Hand-coloured plate of crimson sweet pea flowers
    Art nouveau calendar print with sunflowers

    Three tools

    Seed database

    Filter 93 plants by temperature, depth, days, light and whether the seed needs a chill, soak or nick.

    Search    Sowing calendar

    Your last-frost date in, a dated list of indoor starts, planting out and direct sowing out.

    Plan    Germination troubleshooter

    Is it late, cold, too deep or dormant? Check your plant against its expected window, then work through the causes.

    Diagnose

    Guides

    Starting seedsThe basics of starting seeds indoors and out: containers, mix, humidity, temperature, light, feeding, potting up and hardening off.Organic, heirloom and non-GMO seedWhat organic, heirloom, open-pollinated, hybrid and non-GMO seed mean, how to read a seed packet, and where to buy organic seed.Seed anatomyHow seeds are built, what monocot, dicot and gymnosperm mean, and why it changes how seedlings grow.Annual flowers from seedHow to grow annual flowers from seed for borders, pots, balconies, edging, height, pollinators, fragrance and dry or shady spots.Perennial flowers from seedHow to start perennial flowers from seed: sowing time, cold stratification, containers, light, temperature and when to plant out.Biennial flowers from seedHow to grow biennial flowers from seed: when to sow, overwintering, planting, saving seed, and what to plant them with.Wildflowers from seedHow to grow wildflowers from seed: native seed, mixtures, dormancy, stratification, scarification, sowing, care and pollinators.Climbing plants and vines from seedAnnual and perennial climbers from seed: sowing, germination, supports, watering, pruning, feeding and saving seed.Cut flowers from seedGrowing cut flowers from seed: easy annuals, sowing times, thinning, transplanting, watering, feeding, native and fragrant cutting flowers.Fragrant flowers from seedFragrant flowers to grow from seed: sweet pea, nicotiana, alyssum and herbs, for patios, borders, bees, tea, potpourri and sachets.Cottage garden flowers from seedCottage garden flowers from seed: heirloom and native plants for borders, edging, arbors, fences, clay, sandy, dry and shady soil.Flower bulbsHow and when to plant flower bulbs: depth, spring, summer, autumn and winter flowering types, containers, forcing, and tender bulbs, tubers and corms.Growing fruit from seedGrowing fruit trees and plants from seed or pits: stratification, dormancy, germination, seedling care, tropical and native fruit.Herbs from seedGrowing herbs from seed: sowing, germination, soil mix and pH, potting up, containers, hydroponics, companions, pests and diseases.

    Where the numbers come from

    University extension services, the NDSU time-and-temperature chart, Johnny's Selected Seeds and Fedco growing guides and the New York Botanical Garden. Each plant page links the sources it draws on. See About.

    New to starting seed? Grow From Seeds is our sister site for beginner technique.