Thanks, it kept growing and blooming until the bamboo trellis was sagging in several directions at once.
I don't know why I didn't get volunteers. Seeds that matured in the fall would have rotted before reaching the ground, but there were seeds that matured during the summer. I did turn that bed, but that never kills weed seeds!
Maybe MG seeds don't like soaking wet soil for months on end!
I think that MAYBE letting some seeds age for several years breaks their dormancy. In the case of an impenetrable seed coat, I don't know - conceivably some part of the seed coat turns porous after several years in storage? Pure speculation.
