Let me preface this by saying I am NOT licensed in my state for weed control. My wife and sister are taking over the landscaping duties for our church and school as charity work. The beds are not to bad right but have the usual broadleaf weeds in them. Tomorrow I will be reshaping all the beds and the mulch will be in next week. My question is before I put the mulch down what can the weeds be sprayed with that wont harm the plants and bushes around them and is there any sort of pre-emergent I can put down as like a year long barrier to stop them from coming up? Thank you.