I filled my garden with one of each gnome but they only gave a max of 8 seed packets (at most times they gave me 6.) These packets resell for §100, so if you place a total of 6 or 8 gnomes in your home during gnome appreciation day then that's approximately §12,000 profit if you don't need the seeds, otherwise they will give you the majority of seeds that came with the base game (not the rare ones though) and the seeds that came with seasons (the only seeds I didn't get were chrysanthemum, sage, mushroom and parsley, but that could've been down to bad luck.) I also noticed that some of the seed packets bug out where they're buried in the ground, you'd need to build rooms on top of the soil where the gnomes congregated to bring them to the surface.