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least important aspect of tree surgery, should be left to experts only. With this exception: Where a cavity extends down a trunk into the root-crown, it often pays a tree owner—after he has cleaned out, painted, and rodded the hollow above-ground—to excavate the decay downward as far as he can, then lay a base of small stones and pour filler (an asphalt-sawdust mix) into the hollow until its surface rises a few inches above ground level. When it hardens, this fill by its weight alone may improve the tree's balance and anchorage. The top of the fill can be kept sloped and moisture-sealed against the tree's butt shell with thick tree paint or a plastic. |
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