Why mulch
Mulch moderates soil temperature, holds moisture, suppresses weeds, builds soil and keeps mowers away from trunks. It is the most economical tree care you can do.
How deep
A layer of two to four inches is plenty. Deeper mulch can suffocate roots and hold too much moisture.
How wide
Spread mulch as far out as you can, ideally to the dripline. A wide ring is far better than a small one.
Keep it off the trunk
Pull mulch back several inches from the trunk so the root flare is visible. Mulch against bark invites rot, rodents and insects.
Which mulch
Shredded bark, wood chips and leaf mulch all work. Fresh arborist chips are great. Avoid dyed mulch of unknown origin and rubber.
Refresh, do not pile
Fluff old mulch and top up thinly. Adding a new layer on top of a deep old one builds too much.
Two to four inches, wide and away from the trunk.
