Persian Ironwood

Persian ironwood is a small to medium deciduous tree in the witch-hazel family (Hamamelidaceae), native to the forests of northern Iran, in the Alborz Mountains along the Caspian Sea and the Talysh Mountains of Azerbaijan. It is grown above all for outstanding four-season structure: exfoliating bark that flakes away in a jigsaw-puzzle pattern of gray, green, and cream, most striking on mature trunks in winter once the leaves have dropped. It naturally develops a low-branching, wide-spreading, vase-to-rounded form and is often grown multi-stemmed to show off the bark, though it can be limbed up into a clean single-trunk small tree.

In late winter to very early spring, well before the leaves emerge, small clusters of flowers open directly on the bare branches - petal-less, made up of tufts of crimson-red stamens, much like its witch-hazel relatives. They are not conspicuous from a distance but a welcome, close-up sign of the turning season. The real seasonal highlight is fall: the glossy, leathery, oval leaves move through an unusually long, layered progression of yellow, orange, deep red, and burgundy, often several colors present on the tree - and even on a single leaf - at once, holding for weeks longer than most trees.

It is remarkably adaptable and low-maintenance once established, tolerating heat, drought, urban conditions, compacted soil, and both acidic and moderately alkaline ground, unlike many of its Hamamelidaceae relatives. It is essentially free of serious pests and diseases and rated highly deer resistant. First introduced to Western cultivation in the early 19th century and named for the German naturalist F. W. Parrot, it is now a popular specimen or street tree, valued as a tough, long-lived substitute for shorter-lived, disease-prone trees like Bradford pear. It is related to the Chinese ironwood (Parrotia subaequalis) and, more distantly, to witch hazels (Hamamelis) and Fothergilla.