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.
Hybrid between L. alpinum and L. anagyroides. Grows to 15–30 ft. tall and 10&n...
Loose clusters of blue flowers on 1–2-ft. stems. Flowers of ‘Orion’ are deeper blue,...
In cultivation, grows to 80–160 ft. tall and 20–30 ft. wide; in forests, regularly to abov...