Hydrangea serrata 'Tuff Stuff'
Reblooming mountain hydrangea with delicate lacecap blooms. Takes more cold than macrophyllas and keeps flowering after harsh winters.
The leaves and flower buds contain a cyanide compound. It is rarely a problem for people, but it is listed as toxic to dogs, cats, and horses, so keep prunings away from animals that browse.
For gardeners who like to stay ahead.