How to Grow Sunflower Seeds in Florida

Clear a planting site, located in full sun, of all weeds and other unwanted vegetation. Select an area with well-draining soil, as sunflowers will die if planted in saturated sites. All varieties of sunflowers grow best planted in full sun, according to the University of Florida.

Amend the planting site with compost or manure, as the majority of Florida's soils have a tendency to be sandy and lacking nutrients. Dig the organic material approximately 6 inches into the soil. Florida sunflowers perform best in soils amended with organic materials, according to the University of Florida.

Plant the sunflower seeds ¼- to ½-inch deep into the soil. Space multiple seeds according to the package directions, if planting multiple plants.

Water the sunflower seeds after planting, keeping the soil moist during germination, which occurs in one to two weeks, depending upon the variety. Water plants regularly for the best growth, especially if your region of Florida is experiencing hot, drought conditions. Plants are relatively tolerant to drought conditions once mature, but will grow best watered regularly.

Install two stakes approximately 1 foot apart on each end of bed, if growing extremely tall cultivars that require additional support. Use stakes at least one-half the length of the projected height of the sunflower.

Wrap twine around the stakes, encircling the sunflower plants and tie it off. The plants will grow up between the twine, be supported and are less likely to fall over due to their height.

Apply a 2-inch layer of mulch around plants after they start growing, helping the soil retain moisture and cutting down on unwanted vegetative growth. Florida's sandy soil loses moisture quite quickly.