in the U.S.A., 1830s
"In the great silk mania that occurred here between 1826 and 1841 probably no tree was more widely sold than the 'silkworm mulberry.' "
Plants & gardens, Volumes 23-24, Brooklyn Botanic Garden, 1967
Plants & gardens, Volumes 23-24, Brooklyn Botanic Garden, 1967
The 'silkworm mulberry' mentioned was 'Morus multicaulis'.