Laburnums thrive in any. They grow-rapidly from seed, although sometimes they are not very long-lived. Plant from October to March.
Laburnum alpinum (scotch laburnum), 15 ft., yellowin June.
L. anagyroides (common laburnum), 20 ft., one of the joys of the spring garden with its golden-yellow pea-flowers which are borne very freely in May.
L. vossii, 20 ft., a hybrid that bears trails of flowers 9 in. long in June.
There is also the most unusual graft hybrid between a cytisus and a laburnum: Laburnocytisus adami, 20 ft. or more; the flowers, borne in spring, may be the purplish flowers of the cytisus, the yellow flowers of the laburnum, or the purplish-pink flowers of the laburnocytisus.