Japanese Pagoda Tree ‘Regent’ · Sophora japonica ‘Regent’

'Regent' is a clonal selection of Styphnolobium japonicum (long traded as Sophora japonica), bred to remove the variability of seedling pagoda trees. It carries a vigorous, uniform upright-oval crown with a clear central leader and a half-open canopy of fine, pinnate, glossy foliage, giving the structural consistency an alignment or repeated street planting requires. Mature dimensions reach roughly 15 to 20 m in height and 12 to 15 m across, with medium annual extension.

The defining ornamental phase is the late-season flowering: creamy-white, lightly fragrant pea-flowers borne in large terminal panicles through July to September, when little else of this scale is in bloom. As a clone, 'Regent' reaches flowering age sooner than seedling pagoda trees, which can take decades. Flowering is most reliable and most profuse after a hot summer, so display is fullest in warm-temperate and continental-summer climates and more sporadic in cool, wet maritime seasons.

The climate envelope is broad. The species is winter-hardy to about minus 28 °C (USDA zone 4b), making it dependable from the Mediterranean and Atlantic seaboard deep into cold-continental Central and Eastern Europe, including the Pannonian basin and southern Scandinavia. It withstands summer maxima above 35 °C, urban heat, air pollution, and established drought, a tolerance rooted in its dry East Asian native range. It prefers full sun and free-draining loamy or sandy soils; assured drainage matters more than rainfall, and it accepts below 500 mm once established.

Two points warrant siting attention. The timber is comparatively brittle, so the tree resents heavy, wet snow and strong wind on a poorly formed crown; sound formative pruning to a single leader is the safeguard, and 'Regent' was selected partly to make that structure easier to hold. The seed pods are toxic if ingested, a consideration where ground litter meets intensive public use.

Within the shared European urban canon alongside Tilia, Gleditsia triacanthos, and Platanus x acerifolia, it offers a heat- and drought-adapted alternative with a distinctive late-summer flowering season and clean, light-textured foliage.