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 as "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.