If you want to gather seeds from exploding seed pods, lay a strip of parchment or fabric over the ground at the base of the plant (like you would use fabric around the base of a Xmas tree), then put one of those plastic cones that vets use on dogs around the plant so that the small end (where the pet's neck would be) is on the fabric. When the pods explode, the seeds are caught by the cone and they roll down onto the fabric! The larger the plant, the larger the cone needs to be. HTH.
