How does a river birch hold up in a storm?
River birch is supple and bends a long way under ice rather than snapping, but bending is the failure mode — fine twigs and dense tops load with glaze and clump stems fold to the ground, and many never stand back up. That turns into a reduce-or-remove decision rather than a broken-limb cleanup, and because birch decays fast, trying to salvage a folded stem usually costs more than it returns.
What pruning can and can't prevent
Prune river birch in late summer or fall, or after the leaves have fully expanded in early summer — never late winter or early spring, because it bleeds sap profusely from cuts made when the sap is moving. The clump form is the real trap: the moment to remove a crossing or redundant stem is in the first ten years, since a mature clump stem leaves a wound the tree cannot close and birch decays quickly behind big cuts.
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