When and How Often to Mulch
Mulch once or twice a year: a main application in mid to late spring once the soil has warmed, and an optional light top-up in fall. Refresh as needed to keep a 2 to 3 inch layer, rather than piling fresh mulch on top of old every season.
Timing
Spring is the main mulching season - apply after the soil warms and weeds are cleared, which holds moisture through summer and suppresses new weeds. A thinner fall layer can insulate roots over winter.
Mulching too early in spring, before the soil warms, can slow growth, so wait until the ground is no longer cold.
Refreshing vs reapplying
Check the depth before adding more. If you still have 2 inches, just fluff it and add a thin top-up. Only add a full layer when it has broken down or thinned out.
Piling new mulch on old year after year leads to a thick, matted layer that sheds water and suffocates roots. The mulch calculator helps you order only what you need to reach 2 to 3 inches.
FAQ
How often should you mulch?
Usually once a year, with an optional light top-up. Refresh to maintain a 2 to 3 inch layer rather than adding a full layer every time.
When is the best time to mulch?
Mid to late spring, after the soil has warmed and weeds are cleared. An optional thinner layer in fall helps insulate roots.
Should you remove old mulch first?
Not usually. Loosen it and top up to the right depth. Remove it only if it has matted, molded, or built up well past 3 to 4 inches.