The species is from Northern China and was introduced into western cultivation about 1881 by E. Brestschneider who collected seeds in Peking area.
Cultivar Origin
Summer Charm was introduced by Discov-Tree Research of Oquawka, Ill. in 1993.
Notes & Reference
#01-Manual of Woody Landscape Plants (Michael Dirr)
, #93-North American Landscape Trees (Arthur Lee Jacobson), #104-Lilacs A Gardeners Encyclopedia (John Fiala)