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Does anybody know how to collect seeds from tall garden phlox? I've read where the seeds would look like balls and shoot out. I don't see anything that looks like balls on my garden phlox plants and see no seedlings germinating around it. Does anybody have any that they have collected from their phlox plants that you could show me a picture of what they look like?
I have no picture of it, but the seedheads look indeed like small brown balls. The seeds are in the balls.
I'm in the same zone as you, and my Phloxes haven't set seed yet. First blooming must be completely done and than it takes at least 4 weeks to ripe the seeds and often even longer, depending on the weather.
If you get no seedheads, you might have a cultivar. Breeders often 'build in' that their plants do not set seed, so if you want more plants, you'll need to buy them.