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 specimen in lawn or border, plant in groups in front of neutral background, or space regularly in 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 Laburnum alpinum and L. anagyroides. 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 Laburnum alpinum and L. anagyroides. To 15–30 ft. tall and 10&ndash
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