Is my american hornbeam safe in a storm?
Forest Service silvics calls it very windfirm, and the wood is hard enough that ice bends it rather than snapping it, making it one of the better performers in an Indiana ice event. When one does fail it is almost always the multi-stem form — two or three codominant stems with included bark at the union splitting apart, or a whole leaning stem letting go in saturated clay.
What pruning can and can't prevent
Prune in the dormant season and keep the cuts few, because it grows slowly enough that an over-thinned hornbeam takes a decade to fill back in. The species trap is the fluted trunk: the flutes distort the branch collar, so a cut that looks flush on one side digs into live stem on the other, and the thin gray bark does not close over that kind of wound.
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