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On Dec 12, 2008, altagardener from Calgary, AB (Zone 3b) wrote:
According to Robert Nold (Penstemons), Penstemon 'Pink Holly' is a hybrid of species within the Dasanthera subgenus. It is the result of a cross between 'White Knight' and [((Penstemon davidsonii x P. fruticosus) x P. rupicola) x P. rupicola 'Albus']. (A small number of other penstemon cultivars resulted from this complex cross.)
This plant has been said to grow in the following regions: