Buy Flowers › Penstemon strictus 'Rocky Mountain' - 4" Pot Penstemon strictus 'Rocky Mountain' - 4" Pot $6.50 Rocky Mountain Beardtongue, perennial zone 4-9, 30" tall, violet blue flowers in June Add To Cart Added! Rocky Mountain Beardtongue, perennial zone 4-9, 30" tall, violet blue flowers in June