Removing Old Mulch
We have a large ornamental grass and perennial bed between a parking lot and a commercial sidewalk. The garden is 3 years old and we used 3" of shredded mulch when it was put in and now needs more mulch. The mulch is quite matted, Should the old mulch be removed before new mulch is added.
Crow Wing County Minnesota
it is up to you. Mulch has a dual purpose and the second purpose is improving the soil as it breaks down. If does not smell or look unattractive it can be left in place. Don't have more than 4 inches of mulch on the beds or under trees at anyone time.