Fact Sheet How to Grow Sunflowers

Growing Sunflowers Sunflower is the common seed name for the genus Helianthus. The sunflower is native to North America, and was used by early North American Indians for food and pressed to make hair oil. Meal from processed seed has been used for livestock feed. Today, whole seeds are used for oil, bird seed and snacks. The seeds are a rich source of calcium plus 11 other minerals. The 50 percent fat composition is mostly polyunsaturated linoleic acid. Culture Sunflowers do best when grown on soils with adequate water-holding capacity, internal drainage and proper fertility. They will tolerate a wide range of soil types; however, one that is too high in nitrogen encourages excessive plant growth that will check maturity of the flower heads. Adequate levels of phosphorus and potassium are recommended, and, as with any garden activity, frequent soil tests are recommended to get good results. The plant's roots go deep and spread extensively, so the sunflower can withstand some drought and nearby cultivation. Sunflowers should not be water stressed during the critical period; about 20 days before and after flowering. Plant seed into moistened soil one to two inches deep, but no deeper than three inches. Space seed 12 inches apart in rows spaced 2 to 2 1/2 feet apart. Plants grown for large heads should be spaced farther apart or scattered around the garden. Depending where you live planting can take place from early April to mid-May. Seed bed soil temperature must be between 42 and 50 degrees F with temperatures above 50 degrees F preferable for germination to occur rapidly. Depending on variety and environmental factors, germination will occur in 7 to 12 days. Plants will mature in 80 to 90 days. For the home situation, seed can be started in four-inch peat pots and transplanted outdoors. Transplants may grow taller and flower sooner than seed started plants. They should start to flower in ten weeks. Weeds can be a problem for sunflowers. Weed control is practiced for the first four to five weeks after seed emergence. For the home garden, hand weeding and mulching are the best methods. Call For Price 440-320-7854