How-to Guide
How to Grow Poppies
The short answer
Sow poppy seed directly where it is to flower, in late fall or very early spring, because poppies do not transplant well and dislike having their roots disturbed. Cover the seed with no more than 1/8 inch of soil, since poppy seed needs light to germinate.
Thin seedlings to about 4 to 6 inches apart before they reach 6 inches tall, and keep the soil evenly moist through germination and early growth.
Deadhead spent blooms to prolong flowering; leave a few seed pods to ripen at season's end if you want the patch to self-sow for next year. If you must use transplants, sow into biodegradable pots and plant pot and all to avoid disturbing the roots.
Why you direct-sow instead of buying plants
Poppies form a taproot and resent being moved, which is why Utah State Extension states plainly that poppies do not transplant well. The nursery six-pack that works for petunias is the wrong approach here: the disturbance checks or kills the plant. Scatter seed onto prepared, weed-free soil where the flowers are to stand.
The seed itself is tiny and needs light, so it is barely buried — cover with no more than 1/8 inch of soil, or press it onto the surface and water gently. Sowing too deep is the most common reason a poppy row never comes up.
If you truly cannot direct-sow, start seed in biodegradable pots and plant the whole pot into the ground so the roots are never handled. Both the annual types (like Shirley and breadseed poppies) and perennial Oriental poppies follow the same don't-disturb rule.
Timing, thinning, and care
Poppies germinate in cool conditions, so sow either in late fall (to sprout the following spring) or in very early spring, several weeks before the last frost — they tolerate light frosts as seedlings. Sow rows 12 to 24 inches apart, or broadcast for a drift.
Once seedlings are up, thin them before they reach 6 inches tall to about 4 to 6 inches apart; crowded poppies stay small and flop. Keep the seedbed evenly moist during the germination window, then water normally.
Poppies want full sun and well-drained soil and dislike rich, heavily fertilized ground, which produces floppy growth at the expense of flowers. For point-specific timing and spacing numbers, see the poppy planting calculators.
Deadheading and self-seeding
Removing spent flowers before they set seed prolongs blooming and keeps the plant tidy — Penn State's deadheading guidance is that cutting off faded blooms redirects the plant's energy from seed-making back into more flowers. For a longer poppy season, deadhead regularly.
The trade-off is next year's plants: poppies self-sow readily, and if you deadhead everything you remove the seed that would refill the patch. The usual compromise is to deadhead through the main flush, then let the last flowers ripen into pods.
Leave those pods on the plant until they dry and the little pepper-shaker holes open at the top, then let them scatter or collect and re-sow. Because poppies come back from self-sown seed, an annual poppy patch can behave almost like a permanent one.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Utah State University Extension — Seed Poppy in the Garden — Poppies do not transplant well; sow seeds in late fall or very early spring, cover with no more than 1/8 inch of soil because poppy seeds need light to germinate; sow rows 12 to 24 inches apart; thin plants to 4 or 6 inches apart before seedlings reach 6 inches tall; if using transplants, use a biodegradable pot and plant the entire pot to avoid disturbing the roots.
- Penn State Extension — To Deadhead or Not? Your Final Answer is... — Deadheading spent flowers redirects the plant's energy away from seed production and back into producing more blooms, prolonging flowering; leaving seed heads allows plants to self-sow.