Growers need a hybrid that will mature well within the average frost-free period. Test weight also is an important trait for consideration, especially for hybrids selected for late planting or replanting. A test weight of 25 pounds per bushel is required to make official USDA grade, but recently developed hybrids have test weights ranging from 28 to 32 pounds per bushel. Self compatibility, the ability of the sunflower plant to pollinate itself in the absence of insect pollinators, is another desirable trait in hybrids. Finally, the last item to consider is the purchase of the seed from a reputable seed company and dealer with a good technical service record if production problems do occur and assistance or consultation is required.
Hybrid seed is available for oilseed, nonoilseed and high oleic sunflower production.
Growers generally have signed contracts for marketing of nonoilseed or high oleic sunflower prior to planting since they are considered specialty crops. However, some growers do elect to produce these types on an open market basis. Semidwarf Sunflower Semidwarf sunflower are 25 to 35 percent shorter than normal height hybrid sunflower. Research results show seed yield and oil content of semi-dwarf and normal height sunflower are similar in some years but not always. In drought stress years, seed yield of semidwarf sunflower was less than normal height hybrids.