Iâm having some problems with my sunflowers. First two of them turned black and began to die. I removed them from the garden to prevent further spread of what ever it was. Does anyone know what it was (the flower buds turned black then the leaves started to turn black and wither)? The next problem I am having with sunflowers is that there are a lot of holes in the leaves and there are yellow spots all over them. I was hoping to grow them out for seed but itâs not looking too good.