Well...I was thinking of putting about a 1/2 " layer of cow manure around the planted periwinkle on the bank; possibly that could help it to spread? It is good on the bank, and from nothing to well over 150 periwinkle plants blooming, it is nice to look at, but I was surprised that it didn't take off and spread that much; even after using the Hormex on the roots. Now if I plant again, I am going to use Miracle Gro and cow manure. I just wanted the bank there to be completely covered, and thought I filled up the spaces last spring with planting again, but obviously there are still more spaces to be filled. Sometimes I think, that possibly some animal might be taking them? I heard that deer stay away from periwinkle and packasandra. I will try again with the Miracle Gro and possibly the cow manure. This time , I was even thinking of going to the store and buying periwinkle instead of digging it up in areas of the land we have where it can be spared; but that can get costly buying it from a nursery. Any other suggestions, sure would be appreciated. I just water them now, almost every 3 days or so, because we haven't had much rain lately here.