I thought Cedar mulch was supposed to repel ants. Some yes and some definite no. I think there are crazy ants going over and through a fresh new layer of Cedar mulch. The only thing I can think of is that perhaps I put some over an existing colony and they have to get to and from. Even when it repels the ants they'll still walk right beside or above it. Starting to think cedar mulch isn't all that it's cracked up to be.