There could be several factors - dry weather, poor pollination, or sunflower moth larvae could be tunnelling into the seeds and eating the insides. Some types of sunflowers are bred not to produce pollen so their seeds are sterile. Reply
There could be several factors - dry weather, poor pollination, or sunflower moth larvae could be tunnelling into the seeds and eating the insides. Some types of sunflowers are bred not to produce pollen so their seeds are sterile.