Hybrid purity question
I have a completely fantastic bellflower, Campanula persicifolia 'Takion Blue', which I've posted about on a few other forums. Sorry if you've read my posts elsewhere and are tired of hearing me! It is still putting out lots of blooms and buds and we've already had several frosts up here (no killing frosts yet). It is so pretty, and I will have more!!! I'd like to try to harvest the seeds from it, but I have some questions.
Since it is a hybrid I know there is a chance it won't come true from seed and I'll get a "normal" bellflower. BUT, don't Campanula persicifolias have to pollinate with other Campanula persicifolias? If this is the ONLY bellflower blooming, and has been the only bellflower blooming for a couple of months, does that mean the only thing that could have pollinated it is itself? I have two side-by-side, so they can also pollinate each other. I am waiting for the seeds pods to dry and be ready. I did, however, deadhead these two because I wanted blooms coming as long as they would. I haven't deadheaded in four to six weeks now, and it's still so full of blooms that apparently all my deadheading did was remove seed pods that could have been ripened by now!!
If I am able to get a ripe seed pod, what are my chances that they will be true viable 'Takion Blue' seeds? I have already checked on the web about seed production, and 'Takion Blue' seeds are sold by many companies, so that must mean that there is a way to get good seeds and the flowers are not sterile.
What say you experts?