 Sycamore self @-@ seeds very vigorously , the seeds germinating en masse in the spring so that there is little , or no , seed bank in the soil . It is readily propagated from seed in cultivation , but varieties cannot be relied on to breed true . Special cultivars such A. pseudoplatanus ' Brilliantissimum ' may be propagated by grafting . This variety is notable for the bright salmon @-@ pink colour of the young foliage and is the only sycamore cultivar to have gained the Royal Horticultural Society 's Award of Garden Merit . A rare weeping form with dangling branches , A. pseudoplatanus var. pendulum , was first sold by Knight & Perry 's exotic nursery in Chelsea , England before 1850 when the name was published by W.H. Baxter in the Supplement to Loudon 's Hortus Brittanicus , but no specimens of this cultivar are known to survive . 
