Laburnum x watereri
These upright growers are usually pruned into single-trunked trees, but can be shrubby if permitted to keep basal suckers and low branches. Green bark; bright green leaves divided into three leaflets (like clover leaves). Handsome during bloom in mid- to late spring, when yellow, sweet pea–shaped flowers appear in hanging clusters similar to those of wisteria.
Use as a specimen in a lawn or border, plant in groups in front of a neutral background, or space regularly in a long border of perennials, rhododendrons, or lilacs. Flexible branches make plants easy to espalier or train over an arch (or a series of arches).
Hybrid between L. alpinum and L. anagyroides. Grows to 15–30 ft. tall and 10–20 ft. wide, with 10–20-in.-long flower clusters.
‘Vossii’ is the most widely grown, most graceful variety, with flower clusters near 20 in. long.
In cultivation, grows to 80–160 ft. tall and 20–30 ft. wide; in forests, regularly to abov...
Loose clusters of blue flowers on 1–2-ft. stems. Flowers of ‘Orion’ are deeper blue,...
Hybrid between L. alpinum and L. anagyroides. Grows to 15–30 ft. tall and 10&n...