S. paucicostata , from northern China , is the most cold - tolerant species .
S. paucicostata , from northern China , is occasionally grown in gardens in Europe and North America , though it is not generally considered very attractive as an ornamental plant .
S. paucicostata , from northern China , is the most cold - tolerant species and is occasionally grown in gardens in Europe and North America , though it is not generally considered very attractive as an ornamental plant .