The gardening experts also advised gardeners to avoid placing mulch directly against plant crowns or tree bases.
They said: “Mulch placed directly in contact with stems or tree trunks may retain excess moisture around the base of the plant.
“Overly wet soil can foster a whole host of diseases, including crown rot.
“High piles of mulch can also become a bit of a varmint hotel, attracting predatory insects and bark and stem-eating rodents.”
Instead the experts suggested giving the base of plants and shrubs a little bit of room to breathe.