How mulch is too mulch? Kiefer answers

SALISBURY — Town Tree Warden George Kiefer has pithy advice for those looking to add mulch to their trees: “No volcanoes.â€

He was referring to the all-too-common practice of piling too much mulch around a tree. It might look nice, but to the trained eye it is troublesome.

According to treesaregood.com (the Web site of the International Society of Arboriculture), the recommended mulching depth is 2 to 4 inches.

“Unfortunately, many landscapes are falling victim to a plague of overmuching,†the site warned. “A new term, ‘mulch volcanoes,’ has emerged to describe mulch that has been piled up against the base of trees.â€

“It drives me crazy,†said Kiefer, speaking from 70-plus years’ experience. “The mulch should not get near the trunk of the tree.â€

Problems associated with overmulching include: excess moisture in the root zone, which can cause root rot; insect and disease problems; changes to soil pH levels; creation of habitats for rodents that chew the bark and can girdle the tree; prevention of water and air from penetrating; weed growth.

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