I moved into a home with half an acre to garden. NOT! I have two small kids and work so I do not have the time. The gardens consist of small plots with large trees stuck in the middle. By the time summer comes around there are tonnes of ugly perennials with long grren leaves and no flowers. I want to cover up the gardens with cocoa mulch to avoid planting other flowers. Do I just need to cover the area with mulch or do I use that garden blanket type thing I see at garden centres and then put the mulch on top of that?