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Filling a Tree Stump Hole: Thinset Mortar is Fine Deep Down

Leftover thinset mortar can fill the bottom of a stump hole if the top of the fill is >6 inches below grade. Grass roots only go 6 inches deep. Compacted clay also works.

About Gardening: Hollow Area Under Large Oak Tree: Insect Decay, Not Animal Digging; Filling a Hole in a Ligustrum Hedge; Stump Removal Methods for Pear and Mandarin Trees; Borer Infestation in a Mature Pine: Treatment and Wound Management; Holes in Tree Trunk: Woodpecker or Squirrel Nest; Should You Fill a Cavity in a Black Walnut Tree?; Black Locust Storm Damage: Natural Healing Process; Saying Goodbye to a Tree: Safe Removal Steps and Stump Solutions; Tree Cavity Care: Why Filling Hollows Does More Harm Than Good; Pileated Woodpecker Holes in Your Tree: Should You Worry?

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