Technically speaking you can root cuttings from a crabapple tree. However, those prunings are woody cuttings and therefore are not very likely to root. Semi-woody cuttings from current season growth will be more likely to root, but even this takes a rooting hormone dip and very specific conditions (moist, well aerated rooting mix, bright but indirect light). Then there is the issue of rootstock. Most trees are on a specific rootstock. Rooted cuttings would be on their own roots and therefore would lack whatever benefit the rootstock provided in disease resistance, size reduction, etc.
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