Wildflower Planting Time Based on Region: Southeast Fall, Winter: Sowing wildflowers in Fall/Winter is the ideal time in the Southeast, with October 1 – December 31 being the best dates. The weather is ideal for starting seeds, and seedlings can grow and harden off before frost. Spring: A good time to plant wildflowers, especially annual species that flower quickly. Plant after the last frost date when soil temperatures have warmed to around 55°F, typically occurring within a month or so after the final frost of winter; this ensures the seeds can germinate properly without being affected by cold weather. Summer: You can plant wildflower seeds in the summer, but the hot sun can dry out the soil and stress your seedlings. Summer is a good time to plant quick-growing annual wildflowers.   Southwest Fall: A good time to plant spring wildflowers in the desert Southwest. Fall's cooler temperatures and seasonal rains help seeds germinate. In the mountains, you can plant after spring frosts. Winter: In areas that get snow, winter seeding can give seeds an advantage in the spring.  Spring: A popular time to plant wildflowers in most states. You can plant after the last frost and when the soil temperature is at least 55°F. In warmer climates, you can plant at the end of the rainy season. Summer: You can plant wildflower seeds in the summer, but the hot sun can dry out the soil and stress your seedlings. Summer is a good time to plant quick-growing annual wildflowers.   Northeast Fall, Winter: The best time to plant wildflowers in the Northeast is in late fall, after the first frost but before heavy snow. This is known as dormant seeding and can take place from November to December. Cold temperatures and damp soil during the winter help wildflower seeds germinate.  Spring: Plant in early spring, after the ground has thawed and soil temperatures reach around 55-65°F. This is a popular time to plant wildflowers because it's typically rainier, which helps water seedlings.  Summer: You can plant wildflower seeds in the summer, but the hot sun can dry out the soil and stress your seedlings. Summer is a good time to plant quick-growing annual wildflowers.   Midwest Fall, Winter: Plant in late fall (November–December) after the first frost. The seeds will overwinter and germinate in the spring. Fall planting is a good option for cooler climates and can give the seeds an early start in the spring.  Spring: Plant in early spring (April–May) after the last frost when the soil temperature is consistently above 55°F. Spring is a popular time to plant because the soil is usually moist from rain, and you can see the wildflowers grow right away. Summer: You can plant wildflower seeds in the summer, but the hot sun can dry out the soil and stress your seedlings. Summer is a good time to plant quick-growing annual wildflowers.   Western Fall, Winter: Plant in late fall (November–December) after the first frost. The seeds will overwinter and germinate in the spring. Fall planting is a good option for cooler climates and can give the seeds an early start in the spring.  Spring: Plant in early spring (April–May) after the last frost when the soil temperature is consistently above 55°F. Spring is a popular time to plant because the soil is usually moist from rain, and you can see the wildflowers grow right away. Summer: You can plant wildflower seeds in the summer, but the hot sun can dry out the soil and stress your seedlings. Summer is a good time to plant quick-growing annual wildflowers.   Pacific Northwest Fall, Winter: Plant in late fall (November–December) after the first frost. The seeds will overwinter and germinate in the spring. Fall planting is a good option for cooler climates and can give the seeds an early start in the spring.  Spring: Plant in early spring (April–May) after the last frost when the soil temperature is consistently above 55°F. Spring is a popular time to plant because the soil is usually moist from rain, and you can see the wildflowers grow right away. Summer: In cooler zones with higher elevation, you can plant wildflowers in late spring to early summer, after the risk of frost has passed. You can plant wildflower seeds in the summer, but the hot sun can dry out the soil and stress your seedlings. Summer is a good time to plant quick-growing annual wildflowers.   Establishment: Sunflowers need full sun. Irrigation is required until they become established. Seed Propagation: When the soil has warmed up to at least 55ºF in the Spring, sow hardy Sunflower seeds where they are to flower. Seeds can also be sown in pots or seed trays and either planted out in their final positions in late fall or overwintered in a cold frame to be planted out in Spring. This technique is particularly useful in gardens with clay soil that is slow to warm up in spring. There are two main methods of sowing outdoors: broadcast and with drills. For both, prepare the seedbed first. Dig over the soil to one spade’s depth, then rake over and firm. For broadcast sowing, sprinkle seeds thinly and evenly on the surface of the prepared seedbed and rake them in lightly. Label seedbeds, then water the area gently but thoroughly with a fine spray. For sowing with drills: Using either a trowel tip or the corner of a hoe, mark out shallow drill holes 3 to 6 in. (8-15 cm) apart, depending on the ultimate size of the plant. Sow seeds thinly and evenly by sprinkling or placing them along each drill at the appropriate depth. Carefully cover with soil and firm. Label each row and water gently but thoroughly with a fine spray. To prevent overcrowding, the seedlings usually need to be thinned. To minimize disturbance to a seedling being retained, press the soil around it after thinning the adjacent seedlings. Water the newly establishing seedlings fairly frequently until the roots have developed. Support is required for the sunflower stems. Stakes help support the stem and protect the seedlings from rodent or bird damage. Birds and small mammals love both the sunflower seeds and the tender young seedlings. A scarecrow or netting may be necessary to protect the plants from herbivores.