I m laying new landscape rock. Do I use pre-emergents before or after I lay the rock?
The load of rock will come with seeds in it, therefore we advise putting the pre-emergent down after the rock is spread. If there were weeds or grass in the area where the rock is going then you should have a post-emergent application before the rock is put down. If it is Bermuda, scroll down to our section on special problems.