Plant propagation is both traditional art and applied science. Made from mature, dormant stems, hardwood cuttings are just one clonal propagation technique we use at the Arnold Arboretum to coax life from some of our most valuable accessions. In New England, we can root hemlock and many other genera via this technique. We collect hardwood material in late fall or early winter after plants enter dormancy and deciduous plants have lost their leaves, selecting younger, healthy stock for optimal results. Hormone is applied to the freshly prepared cuttings, which are usually “stuck” the same day they are collected, in benches filled with quick-draining growing media, tented with plastic to ensure high humidity, and heated from below to encourage rooting. Hormones and wounding treatments are taxon-specific, based upon the scientific literature as well as our own propagation records. Cuttings that survive and root will be potted up in the spring or early summer, eventually to serve as prized members of the next generation of our collections.
15–100
Number of cuttings collected per accession.
172
Accessions in the collections being actively propagated.
Sean Halloran was Plant Propagator at the Arnold Arboretum from 2016 to 2022.