How to Grow California Poppies From Seed

California poppies want cool soil to germinate, so time them for the shoulder seasons. In mild-winter regions like California, Arizona, and the rest of the Southwest, sow in fall right before the first rains and the plants sprout, grow through winter, then bloom in spring. In colder areas, zones 6 and 7, wait and direct-sow in early spring as soon as the ground can be worked. Skip summer sowing, since heat both slows germination and pushes older plants toward dormancy.

Sow California poppies exactly where you want them to bloom. They grow a long taproot and dislike being moved, so do not start them indoors or transplant seedlings. Rake the bed smooth, scatter the tiny seeds across the surface, and press them in with your hand or the back of a rake. Barely cover them, no deeper than an eighth of an inch, because the seeds need light to sprout. Keep the surface lightly moist until seedlings appear in 7 to 21 days at soil temperatures around 55 to 65F, then thin the plants to 6 to 8 inches apart.

Once established, California poppies almost grow themselves. Give them full sun and lean, well-drained soil, and water only during long dry spells, since rich soil and heavy watering give you leaves instead of flowers. Skip the fertilizer. Pinch or snip spent blooms to keep new buds coming, but leave a few flowers late in the season to drop seed and return on their own next year. In hot summer regions the plants may slow down and go dormant, then flush again when cooler weather returns.

California poppies belong in a sunny, low-water bed, so pair them with other drought-tolerant, pollinator-friendly plants that enjoy the same lean soil. These four make especially good neighbors, and you can add any of them in one click:

California poppies bloom from late spring into summer, opening on sunny days and closing at night and in cloudy weather. To keep the show going, deadhead spent flowers every few days so the plant keeps setting buds instead of seed. When you are ready to let them self-sow, stop deadheading and let the slender seed pods dry on the plant. The pods split and scatter their seed, so a single planting often reseeds itself into a returning patch year after year.

California poppy is the golden state flower and a workhorse in low-water gardens. Use it to fill sunny borders, rock gardens, gravel beds, and meadow plantings, or to hold and brighten a dry slope where little else thrives. The open orange cups draw bees, butterflies, and other pollinators, making it a favorite in wildflower and pollinator mixes. Because it reseeds freely, it naturalizes into a self-renewing drift with almost no effort on your part.

• All leaves, few flowers: usually too much water or rich soil. Cut back on watering, skip fertilizer, and grow them in lean, well-drained ground in full sun.
• Poor or patchy germination: the seeds need light and cool soil. Sow on the surface, press in without burying, keep evenly moist, and sow in fall or early spring rather than summer heat.
• Transplant failure: the taproot hates being moved. Always direct-sow and never start them in pots to move later.
• Flowers closing up: this is normal. Poppy blooms close at night and on cloudy, cool days, then reopen in sun.