I agree with all of you, my most prolific seeders are aromatic aster and brown-eyed susan. Now that the prairie bed is mostly filled in, both get pulled or cut back by half in late spring after everything is up and in full swing. In fact I just did that today and found a lot of plants I forgot were there! I don't want to lose my pale purple coneflowers or purple prairie clover or rough blazing star because the asters and susans have taken over and shaded them out. Still I wouldn't want to be completely without them so I include the thinning with the weeding just like amelanchier.
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