Sunflowers are sturdy plants that are often grown to form a border to a vegetable garden. Sunflowers bloom in late summer or early fall. Amend the soil with manure or use commercial fertilizer for best results. For this reason it's wise to plant three times as many seeds as you expect to grow. If planted more closely together, the sunflowers' blooms will be smaller.
Crop rotation is important to keep the soil healthy and to prevent disease.