Masses of beautifully formed soft deep-pink 2-3" (6-8cm) flowers in May and June. Mature height 25-35' (7-10m) (all montana's will have severe frost damage when minimum temperatures fall below 0¡ to -10¡F (-12¡ to -18¡C). The plants will probably survive, however, the tops will be burnt off and the plants will not bloom.) Pruning group A