Looking through the seed websites yesterday I NEARLY ordered a couple of the hybrid sunflowers that are so charming, but I stopped myself. I stopped because I remembered what a pain in the ass they are when they go to seed. They do not breed true and I fought them as weeds for years after planting them.
I suppose I could make an effort to clip their seed heads off when the bloom is mostly spent, but I’m afraid I would forget to do that.
I had a red hybrid celosia that went to seed for a few years, and each year the plants were further and further away from the original parents. They gradually became so scraggly I just pulled them out.