Hydrangea serrata ( Grayswood Lacecap Hydrangea )
H. serrata and its cultivar are also sometimes listed as H. macrophylla subsp . serrata . ‘ Bluebird ’ is also sometimes listed as ‘ Acuminata ’ . H. serrata is generally related to the Bigleaf Hydrangeas , but has a more delicate appearance , with lissome stem , narrow-minded leaves and modest flower . It is native to mountain woodlands of Japan and Korea and is hardier in United States Constitution than H....