Penstemon Nova 'Pearl' offers tubular white flowers on upright stems all summer long.

Perovskia atriplicifolia 'Blue Steel' has some of the darkest blue flowers of the Russian sages.

Perovskia 'Denim 'n' Lace' is a dwarf cultivar of Russian sage with silvery foliage and purple-blue flowers.

Perovskia 'Lacey Blue' is a dwarf cultivar of Russian sage with the classic silver-green foliage and purple-blue flowers.

Perovskia 'Silvery Blue' is a dwarf cultivar of Russian sage with extra silver foliage and purple-blue flowers.

Persicaria 'Blackfield' has wands of deep red flowers that last for months above bold mounds of lance-shaped, mid green foliage.

Persicaria 'Golden Arrow' has wands of red flowers that last for months above bold mounds of lance-shaped, golden foliage.

Persicaria amplexicaulis 'Pink Elephant' is a compact mountain fleece with long blooming wands of pink flowers.

Phlomis tuberosa 'Amazone' has whorls lavender-pink blooms arranged in dense clusters at intervals along burgundy stems .

Phlox 'Minnie Pearl' has sweetly fragrant, pure white flowers on stems 1-2 feet tall with shiny, mildew-free leaves.

Phlox paniculata 'Blue Ice' has warm light purple and icy lavender-blue buds opening to pure white, fragrant flowers with occasional flushes of lavender-blue.

Phlox paniculata 'Blue Paradise' is mildew-resistant with a spicy vanilla-clove fragrance and lavender-blue flowers.

Phlox paniculata Garden Girl 'Glamour Girl' is a tall garden phlox that has purple stems with coral-pink flowers.

Phlox paniculata Garden Girls 'Party Girl' is a tall garden phlox that has pretty white flowers with pink centres on tall green stems.

Phlox paniculata 'Uptown Girl' is a tall garden phlox that has light pink flowers with dark pink centres on tall green stems.

Phlox paniculata 'Goliath' has huge clusters of fragrant, pinkish lavender flowers almost as big as a human head!

Phlox paniculata 'Hercules' has huge clusters of soft pink flowers with white halos almost as big as a human head!

Phlox paniculata 'Jade' has pure white flowers edged in lime green on stems under two feet tall. Moderate mildew resistance.

Phlox paniculata 'Jeana' is a standout pollinator magnet with excellent powdery mildew resistance.

Phlox paniculata 'Laura' is a tall garden phlox with deliciously fragrant deep lavender-magenta white-eyed flowers.

Phlox paniculata Luminary 'Opalescence' is a tall garden phlox that has light pink flowers with dark pink eyes and great fragrance.