I have a very high maintenance customer. Their old landscaper occasionally stops by the property and tells the customer all the things "wrong" with what we are doing to the job they installed years before. Trimming bushes this way, and so on. The new complaint is the thickness of mulch. We installed a double ground hardwood mulch throughout the beds. When we put this down, there was mostly bare soil. It had been a couple of years since mulch had been applied. We put in between 3-5 inches roughly. I was told that on an existing landscape, you should put in a max of 1 inch. For new landscapes, 3-5 would be ok. They want us to remove the "excess" mulch before we kill the plants. Is there any truth to this?? I'm not a guy with 15 years experience, but i can't see where this could be true. In addition, they're telling me that the thickness of the mulch will have nothing to do with controlling weeds. These beds all have applications of weed control. I thought it made sense that with the thicker mulch, less weeds can germinate. I know over time the mulch will break down and turn to soil, thus possibly holding weed seeds. But in your opinion, am I damaging the landscape with the mulch thickness? Any thoughts will help......thanks.