It's best to sow sunflower seeds directly into the soil after the danger of spring frost is past. Ideally, the soil temperature has reached 55 to 60 degrees F. Give plants plenty of room, especially for low-growing varieties that will branch out. Make rows about 30 inches apart.
To plant sunflowers: Space seeds about 6 inches apart in a shallow trench between 1 and 2 inches deep. Cover and keep watered until seeds sprout in 7 to 10 days. When first true leaves appear (the second set of leaves); thin plants to about 2 feet apart.
Easy and rewarding to raise from seed, with impressive, long-lasting flowers, the sunflower is an ideal plant for growing with children. Sunflowers look equally .
Grow sunflowers from seed w/ Harris Seeds' vast selection of pollen free and pollen sunflowers. Leading provider of flower seeds and ornamentals in since .
When and how to plant. Spring or early summer, when the soil is starting to warm up, is the best time to sow sunflower seeds. A typical harvest time is about .