Sunflowers usually take 80 to 120 days to mature and produce new seeds, depending on the variety. [2] X Research source If the growing season is shorter than this in your area, plant the sunflowers two weeks before the last frost; most seeds will probably survive. [3] X Research source
It is not possible to grow plants from roasted sunflower seeds, but you can grow it from sunflowers in bird seed, as long as the outer shell is present. [4] X Research source
If you have a large number of sunflower seeds, and don’t mind a lower success rate, you can skip straight to planting. Seeds planted directly in the soil typically take 11 days to emerge. [5] X Research source If you have a long growing season, try germinating seeds in batches one or two weeks apart, so you’ll have blooms in your garden for a longer period of time.
Keep the paper towels at a temperature above 50ºF (10ºC) for best results. [8] X Research source
Unless your garden receives strong wind, keep the sunflowers away from trees, walls, and other objects that block sunlight.
Rich soil is recommended for giant varieties, since they require more nutrients. [13] X Research source
If you are planting a large sunflower crop, space each trench 30 in (76 cm) apart, or at any distance convenient for your machinery. [15] X Research source [16] X Research source
If deer are in your area, encircle the plants with chicken wire once they start growing leaves. You can use a 36 inch (91 cm) piece of chicken wire to surround the leaves and use a few 6 ft. (1. 8 m) bamboo poles or wooden stakes to raise the chicken wire as the sunflowers grow. This should protect them from deer. [20] X Research source
The period before and after your plant grows flower buds is a critical time and not getting enough water may damage it. [22] X Research source Continue to water the your sunflowers weekly once the flower buds start to form.
Skip this step if you want small blooms to arrange in bouquets, or if you planted at this spacing to begin with.
Another option is a one time application of slow-release fertilizer, worked into the soil.
If left alone, the flowers will drop seeds for next year’s crop. Harvesting them yourself guarantees protection from pests, however.
