The white-margined penstemon (Penstemon albomarginatus) grows in four distinct population centers: Clark and Nye counties in Nevada; San Bernardino County in California; and Arizona’s Mohave County.
To keep your garden looking its best, the RHS recommends targeting three flowers for deadheading: Dahlias Delphiniums Roses and Penstemons “Continue to deadhead plants such as dahlias ...