I transferred and replanted a lot of periwinkle. I have weeded the areas repeatedly, and wonder why it hasn't spread that much? Maybe I need to give it more time. It has been a week or so since I weeded the area, but the area has had a lot, a lot of rain. Just wonder if there is something out there, like a Scotts fertilizer or some type of "miracle" product that would make the periwinkle spread more. Any help with this question, would be greatly appreciated.