Scientific Name (Genus/Species): Veronicastrum virginicum

Family: Plantaginaceae

(P) to 6′.  Bowman’s Root.  Northeast America.  A beautiful plant adorned with eight-inch long spikes of tiny, blue, tubular flowers.  At the base of each central spike exists a second whorl of smaller flower spikes.  This plant makes an exotic and very architectural statement in the garden.  Midsummer.  Sun.  4 & T2

Scientific Name (Genus/Species): Verbascum chaixii Mix

Family: Scrophulariaceae

(P) to 4′.  A delightful blend of yellow and white.  Very versatile.  Sun.  4 & T1

Scientific Name (Genus/Species): Amsonia hubrichtii

Family: Apocynaceae

(P) to 3.5′.  Hubricht’s Bluestar.  Arkansas to Oklahoma.  Clusters of starry, blue flowers in summer but chiefly grown for the soft, feathery texture of its fine, needle-shaped leaves and its luxurious, billowing habit.  In autumn the leaves turn to a rich, burnished gold with overtones of copper and apricot.  Wow.  Moist, well-drained soil.  Sun.  3, 7 for 4 weeks, then T2

Scientific Name (Genus/Species): Aristolochia clematitis

Family: Aristolochiaceae

(P) to 30″.  This non-climbing herbaceous Dutchman’s Pipe has small apetalous, tubular, greenish yellow flowers that bloom from late spring to early summer in clusters from the leaf axils. Each flower has a straight funnel-shaped tube with pointed, curved upper lips (considerably different in appearance from the curved Dutchman’s smoking pipe-type blooms found on some other species in the genus).  Full sun to part shade.  4 & T3

Scientific Name (Genus/Species): Geranium pratense

Family: Geraniaceae

(P) to 2′.  Meadow Crane’s Bill.  Europe.  Strong, upright, many branching stems with pink veined, violet-blue flowers in early to midsummer.  The large, deeply divided, lobed foliage forms a handsome, bushy clump and develops good autumn tints.  Will naturalize where happy.  Well-drained soil.  Sun/partial shade.  3 & T1

Scientific Name (Genus/Species): Linum perenne

Family: Linaceae

(P) to 2′.  Perennial Flax.  Europe.  A short-lived but floriferous perennial producing masses of open, sky blue flowers on upright, branching stems.  Narrow, pointed, blue-green leaves give plants an attractive, feathery appearance.  Blooms from late spring to midsummer.  Well-drained soil is essential.  Sun.  Best sown in situ or 3 & T2.

Scientific Name (Genus/Species): Valeriana officinalis

Family: Caprifoliaceae

(P) to 4′.  Common Valerian or Garden Heliotrope.  Europe, West Asia.  Sweetly-scented clusters of pale pink or white flowers appear on branched stems and emerge out of clumps of deeply toothed, pinnate leaves.  Thrives in sun or partial shade.  3 & T2

Scientific Name (Genus/Species): Dictamnus albus var. purpureus

Family: Rutaceae

(P) to 3′.  A lovely pink to purple variety of Dictamnus albus with prominently veined flowers.  Easy to grow in any fertile, well-drained soil.  Early Summer.  Sun.  3 & T

Scientific Name (Genus/Species): Iris tectorum 'Album'

Family: Iridaceae

(P) to 12″.  A darling white form of the Japanese Roof Iris with pure white flowers sparsely veined yellow.  Light green, fan-like leaves.  It will spread nicely.  Blooms in June.  Sun. 3 & T1

Scientific Name (Genus/Species): Agastache foeniculum 'Alba'

Family: Lamiaceae

Short-lived perennial to 3.5′.  White Anise Hyssop.  A white cultivar of the above. Sun/partial shade.  4 & T2