Stickanswered grow question 6 years ago Hi there! There's many possible reasons for this : genetics (if so, there's not much you can do), heat stress, a serious lack of light, or too much Nitrogen during the flowering cycle. I won't try to prune the tops of these buds since it could stress the whole plant while it's almost ending its life. I'll be around, keep us up-to-date, and good luck with the last weeks!