Review Of When Should You Put Mulch Down References. Web if used around a yard or a contained area such as flower beds or a mailbox, apply mulch whenever you want to enhance landscaping and curb appeal. Mulch is used for aesthetic purposes, to retain moisture and nutrients, slow weeds, and to protect root systems.

Take that number times the depth in inches you would. Web late winter or early spring is the best time to mulch. Mulching too early slows down the thawing of soil after winter.