I can't get this to spread between my pavers. I've decided that the spacing is too narrow (1 to 1 & 1/2 inches) and only filled with sand. It has really done well where there is more room with real soil as it goes into a flower bed. Does anyone have an opinion and if this is the case, what can I do because the pavers have been there a long time and I don't have the money or energy to dig them up and reset them. Thanks.