needrain said:Rick, I think, for canna seeds, that would take a couple of weeks of constant shaking 
. Those seeds are hard and reluctant to abrade. Would it work for Morning Glory? Aren't those about like canna?
Good point, I never tried them. You could well be right. The closest thing that comes to mind would be coarse sandpaper glued to two hard surfaces, then rub them back and forth with a few seeds between. But they might squirt out and escape like watermelon seeds.
The only Morning Glory I ever planted germinated eagerly with minimal soaking and no grinding: "Star of Yelta".
