I let my foxglove seeds drop to the ground to reseed. When they are ready, I do distribute some around, hoping another clump will begin. A small amount of seed I save for planting in the spring. For some reason, I find the seeds that drop by the plant do the best.

http://forums.gardenweb.com/forums/load/seedsave/msg0609432423295.html

There is a good post about collecting the foxglove seeds!