'Princeton' American Elm is one of the best Ulmus for the classic vase-shaped habit and good resistance to both Elm leaf beetle and Dutch Elm disease. Its fast growing upright characteristics were what made our grandfather, William Flemer Sr., select it in the 1920s and the subsequent excellent D.E.D. resistance was a marvelous unexpected bonus. Salt and wet site tolerant.
Allee® ('Emer II') Lacebark Elm was selected by Dr Dirr on the campus of the University of Georgia at at Athens. Ulmus parviflora Allee® has a beautiful vase-shaped habit similar to the classic American Elm, but it also has excellent resistance to Dutch Elm and Phloem Necrosis. The foliage is smaller and the bark is attractively mottled in shades of green, orange, tan and gray. Allee® handles urban conditions well, and has proved to be an excellent addition to urban street street tree choices.
'Blue Jay' Highbush Blueberry produces delicious fruit in June and July, making it a mid season Blueberry. The delicate waxy bell-shaped flowers are white and are attractive to pollinators in May. The fall color of Vaccinium 'Blue Jay' is bright shades of red and orange, and the winter twigs are also attractive as cut branches. Plant with another cultivar for good fruit production.
'Bluecrop' Highbush Blueberry is a mid-season fruit producer, bearing lots of glaucous blue fruit in early to mid July. The bell-shaped white flowers appear in May and are attractive to butterflies and pollinators. The green disease free foliage turns attractive shades of red tones in fall, and the twigs maintain the red tones throughout the winter. Vaccinium 'Bluecrop' is a good commercial cultivar which performs best when planted near another cultivar. Blueberries thrive in wet, acid sites.
'Jersey' Highbush Blueberry was selected for its commercial fruit value in the mid Atlantic region, producing large high quality berries in late June and July. It is considered a mid to late season Blueberry, and is a great cross pollinator for other Highbush Blueberries. The waxy white bell-shaped flowers appear in May in pendant racemes. The fall color is attractive shades of yellow, orange and red, followed by attractively colored winter twigs. All Vacciniums prefer constant moisture and acid soils.
'Sunshine Blue' Southern Highbush Blueberry offers great possibilities as a landscape plant in addition to its fruit producing qualities. The glaucous blue foliage emerges in spring in shades of bronze and ends up in fall in shades of red and burgundy. The drooping racemes of delicate soft pink bell like flowers appear in May, and are followed in June and July by glaucous blue edible fruit (birds will clean them out if you do not net your plants). 'Sunshine Blue' is self fertile so it does not need a pollinator.
Tall Verbena or Brazilian Vervain is not a hardy perennial for the Mid Atlantic area, but this beautiful annual self-seeds vigorously in perennial beds. The clumps of tiny purple flowers are held on tall thin stems and make a lovely airy show from July through September. Butterflies love the late season flowers and they make a pretty addition to cut flowers because of the long clean stems. We enjoy this tough reappearing annual in our gardens year after year.
'Homestead Purple' Clump Verbena has vigorous, low growing green foliage covered with purplish magenta flowers in summer. Needs some winter protection and full sun to perform best. Trim it often to keep the habit neat and flowering.
Broadleaf Ironweed blooms in August and September, producing large showy clusters of deep purple flowers with fine petals. Vernonia glauca is somewhat more compact than its cousin V. noveboracensis, and tolerates dryer conditions. Hiding in the background for much of the summer, it really stands out when in bloom in late summer. Butterflies cover the flowers, adding to the show.
'Iron Butterfly' Narrowleaf Ironweed has many bright purple star-like flowers that appear in late summer and fall. Foliage is delicate and thread-like on a compact plant. This Vernonia is very tolerant of site extremes, both dry and wet and works well in the upper areas of bio-swales. Introduced by Dr. Allan Armitage and North Creek Nurseries. One of the native plants chosen by Piet Oudolf for the newly planted meadow garden at Delaware Botanic Gardens.
PRN Preferred: Not only beautiful purple flowers, but also delicate unusual fine foliage.
'Eveline' Long-leafed Speedwell has showy tall flower spikes of bright reddish violet in June and July, over clean green foliage. Butterflies and pollinators flock to Veronica 'Eveline' while it is in flower. Deadheading increases the bloom period into August. An introduction from Future Plants.
'Red Fox' ('Rotfuchs') Spiked Speedwell has short rose-pink flowers that bloom all summer, especially if deadheaded. Veronica spicata 'Red Fox' makes a good low groundcover, and is a good source of nectar for bees and other pollinators. Needs good drainage.
'Royal Candles' ('Glory') Spiked Speedwell has violet blue flowers in June and July over deep green disease resistant foliage. A fantastic plant from Heather and Mike Philpott of England. Veronica spicata 'Royal Candles' reblooms well if deadheaded.
'Georgia Blue' Speedwell is an attractive fine textured groundcover which is covered with small deep blue flowers in midspring into early summer. The ground hugging green foliage takes on hues of burgundy in the fall and winter. Since 'Georgia Blue' is drought tolerant as well as semi-evergreen, it would make an interesting green roof plant. Because of its extended bloom period, it also has an excellent application in containers and rock gardens.
Culvers Root has tall white spires of Veronica-like flowers in July and August. It tolerates wet sites very well. There's an amazing patch of Veronicastrum virginicum at the Scott Arboretum in full bloom during the Woody Plant Conference in July. It's worth a visit.
‘Cupid’ Culver’s Root is a tall tough native that produces multiple spikes of lavender blue in late summer into early fall. Veronicastrum ‘Cupid’ is an important nectar source for pollinators and butterflies at that time of year, and they also make a striking cut flower. The green lanceolate leaves grow in a whorled pattern, and the clumps are very long lived, expanding with time. This Veronicastrum is particularly showy because of its deep color.
'Fascination' Culver's Root is a lovely tall native which is topped in July and August by graceful 12" lilac to pale blue spikes. The lanceolate leaves cover the tall stems in a distinct climbing whorl pattern. Veronicastrum 'Fascination' is a tough long lived perennial that is particularly effective in prairie gardens and the back of perennial beds and borders.
Mapleleaf Viburnum is a tough, adaptable plant which thrives in shady, dry sites. Creamy white flat-topped flowers in May are followed by purple fruit in late summer and fall. Foliage is green in summer, changing to subtle shades of pink, rose, red and purple in fall. Will become a broad colony eventually because of its suckering habit. Deciduous.
PRN Preferred: Exhibits so many great attributes: a broad site conditions range, attractive flowers & foliage, food for wildlife and deer resistance.
Koreanspice Viburnum has wonderfully fragrant white flowers in April and May, followed by red and burgundy fall color. Deciduous. This and V. x juddii produce the classic scent we love so much from Viburnums. An added attraction is that V. carlesii actually thrives under Black Walnuts.
Spice Girl® ('Spito') Koreanspice Viburnum blooms in April and May, producing extremely fragrant flower clumps that are pink in bud turning to white snowballs when open. The medium green foliage is more deer resistant than most Viburnums, and the leaves turn attractive shades of red in fall. Viburnum carlesii Spice Girl® does well in sun and partial shade. It would make a lovely fragrant hedge as well as an attractive specimen.
Chicago Lustre® ('Synnesvedt') Arrowwood Viburnum has beautiful glossy foliage that is topped with white flat flowers in May and June, followed by stunning cymes of bright blue fruit in late summer. Fall color is a nice reddish purple. An excellent introduction by Chicagoland Grows®. This is a great substitute for Euonymus alatus 'Compacta'. Important food source for migrating birds. Deciduous.
PRN Preferred: A multi-season Viburnum, offering showy flowers, fruit and fall color.
Chinese Snowball Viburnum produces an enormous quantity of lovely sterile blooms. The snowball flowers hang from the branches in May to June, changing from lime green to white as they mature. Viburnum macrocephalum makes a large vase-shaped plant which bears a close resemblance to a Pee Gee Hydrangea when in bloom. The green dentate foliage is attractive and disease resistant and somewhat pubescent. Since the flowers are sterile, there is no fruit. Pruning for a tighter shape is best done just after the bloom period. A native of China.
The white fertile flowers of Brandywine™ ('Bulk') Smooth Witherod appear in summer over glossy dark green leaves. Fruit display in fall is a stunning mix of rosy pink and dark blue, over deep reddish maroon leaves which persist for a long time. Best pollination results are achieved by planting it with V. 'Winterthur'. From plantsman Mark Bulk. It is wet site tolerant and deciduous.
'Popcorn' Doublefile Viburnum produces large quantities of big white snowball blooms in April. The sterile flowers start lime green before maturing to white, and make a stunning show for a month. The habit is upright and somewhat compact. Introduced by David Leach of Ohio, and Dr. Michael Dirr's favorite of the Snowball Doublefile Viburnums. Deciduous, with dark green leathery foliage which stands up to heat better than many of its cousins.
PRN Preferred: The snowball flowers last for a very long time and gradually change from green to white.
'Mariesii' Doublefile Viburnum boasts showy white lacecap flowers in May and June often followed by red fruit in fall. Flowers profusely. It does best in a moist, partially shady spot. Deciduous.
'Watanabei' Doublefile Viburnum has beautiful white lacecap flowers starting in May and intermittently continuing throughout the summer. The habit is significantly more compact than other Viburnum plicatum tomentosum cultivars and the reblooming attribute, while requiring consistent soil moisture, makes Viburnum 'Watanabei' particularly useful. 'Watanabei' was found near Mt Fuji by famous Japanese nurseryman Mr. Watanbe and introduced by Wada Nursery in the 1950s. Red fruit is sparely produced in late summer, followed by nice reddish burgundy fall color.
Blackhaw Viburnum has white spring flowers which are very showy in mass, followed by bluish black fruit which birds love. The fall color of Viburnum prunifolium is a handsome mix of orange, red and purple. Can be grown as a very large shrub or a beautiful small ornamental tree. There is a spectacular treeform example of this versatile native at William Frederick's home in Delaware, which convinced us to grow it as a small ornamental tree as well as a shrub. Deciduous.
'Green Trump' Leatherleaf Viburnum is a wonderful compact form of Leatherleaf Viburnum from Holland, with a rounder more lustrous dark green evergreen foliage, white flowers in summer and much welcomed unattractiveness to deer. This is our favorite Viburnum rhytidophyllum.
'Nantucket' Viburnum came from a cross made by the late Dr. Egolf between V. x 'Eskimo' and V. macrocephalum f. keteleeri at the National Arboretum in 1988. For some reason this excellent plant only recently got the notice it deserves. The large white ball-shaped flowers appear in April and are mildly fragrant. The neat dark green leaves are semi-evergreen, and Viburnum 'Nantucket' has shown excellent heat resistance, according to Dr. Michael Dirr. The habit is somewhat upright, and would be effective as a hedge as well as a specimen plant.
Prague Viburnum has white flat-topped flowers in May, but the glossy dark green foliage is what makes this Viburnum notable. The leaves are smaller and more lustrous than Leatherleaf Viburnums. Semi-evergreen and very cold tolerant.
'Alleghany' Lantanaphyllum Viburnum comes from the breeding work done by the legendary Dr Don Egolf of the National Arboretum. The creamy white flat flowers clumps appear in May and June. They are followed by attractive red fruit in summer which ripens to blue black and is rapidly consumed by birds. The leaves are dark green and broader and shorter than V. rhytidophylloides. 'Alleghany' is a cross between rhytidophyllum and Lantana, so it makes a dense semi-evergreen hedge.
'Dart's Duke' ('J.N. Select') Lantanaphyllum Viburnum has very large showy white flowers in early summer and bright red fruit in fall. The beautiful dark green leathery semi-evergreen foliage makes this Viburnum from Darthuizer Nursery in Holland a real winner. Foliage is very clean and disease-free, and does not droop in the winter as other rhytidophylloides do.
PRN Preferred: We love the lustrous green leaves that do not droop in winter.
'Silver Gem' Prostrate Blue Violet has beautiful silvery heart-shaped foliage, crowned in March by bluish lavender flowers. The undersides of the leaves are burgundy, making a striking contrast to the silver-netted tops. The trailing habit of this tough native Violet makes it an excellent shade groundcover or rock garden plant. Viola 'Silver Gem' reblooms sporadically throughout the summer. Mt. Cuba found this little beauty and the folks at North Creek introduced it.
Chicagoland Blues™ (‘Daniel Searle’) Chastetree is a beautiful compact Vitex with silvery green leaves held on dark stems. The blue flower spikes appear in mid summer and are produced throughout the rest of the summer. Vitex Chicagoland Blues™ was selected by Kris Jarantowski of the Chicago Botanical Garden from a group of Vitex crosses, and has proven to be sterile, so invasiveness will not be an issue.
'Shoal Creek' Chastetree has bluish violet flowers in July and August over aromatic grayish green foliage. Butterflies love this plant and it is also dry site tolerant. Vitex agnus-castus 'Shoal Creek' should be cut back hard like a Buddleia in spring.
Fine Wine® ('Bramwell') Weigela is one of the newest burgundy Weigelas with a tight compact habit and a profuse display of rosy pink flowers in May and June. The foliage color holds its intensity well in the summer.
Sonic Bloom® Pearl ('Bokasopea') Weigela is another exciting rebloomer from Proven Winners. The tubular blooms open white in May, and turn soft pink as they mature. Sonic Bloom® 'Pearl' blooms throughout the summer, especially if lightly pruned after the first heavy flush of flowers. Since this Weigela is easy to maintain and prune, Sonic Bloom® 'Pearl' works well as a foundation shrub or a short hedge. The attractive green foliage is clean and disease free.
Sonic Bloom® Pink ('Bokrasopin') Weigela is a reblooming shrub which produces a series of bright pink trumpet shaped flowers. Sonic Bloom® Pink starts blooming heavily in May, and continues well into the summer months. The green foliage makes a good setting for the blooms. A light pruning after the initial explosion of flowers will make for a stronger rebloom, but it is not essential. Good as a foundation shrub or in mass plantings.
Sonic Bloom® 'Red' ('Verweig6') Weigela produces a multitude of vivid red trumpet shaped flowers in May, followed by repeat waves of flowers until early fall. The green foliage makes a showy setting for the lipstick red blooms, and a light pruning after the first flush will increase the rebloomimg. Pollinators will love this adaptable, long blooming shrub, and Sonic Bloom® 'Red' makes an excellent hedge or foundation plant.
Spilled Wine® (‘Bokraspiwi’) Weigela has a multitude of deep pink funnel shaped flowers in mid spring and early summer, they cover the deep purple foliage and the compact, wide habit makes Weigela Spilled Wine® look almost like a rose and purple carpet. The flower display is lovely, and so is the purple foliage color which remains all summer after the bloom period is done. Because of the wide but tight habit, Weigela Spilled Wine® does not need pruning to keep its attractive performance.
Wine & Roses® ('Alexandra') Weigela has rosy red flowers in June over burgundy foliage. Pruning keeps this plant neater and maintains the foliage color later into the summer. From Herman Geers of Holland.
'Amethyst Falls' American Wisteria has fragrant, short bluish lavender flowers from June to August on current season's growth. It reblooms sporadically throughout the summer. It tolerates wet sites, and works well on pergolas. Introduced by Bob Head of Head-Lea Nursery.
'Nivea' American Wisteria has fragrant white flowers on short racemes in June and July and reblooms sporadically. Less showy but much less aggressive than the Chinese Wisterias.
Yellowroot has interesting tiny brownish purple flowers in spring and later produce star-shaped fruit enjoyed by birds and small animals. The foliage of Xanthoriza ia bright green and celery-like, it forms a dense carpet innumerous types of conditions. Yellowroot has long been used by Native Americans as a dye. Fall color starts off yellow and changes to a reddish purple later in the season. Yellowroot spreads to make an excellent colonizing groundcover. Good for banks and soil stabilization.
'Color Guard' Adam's Needle has a creamy-yellow center stripe that turns rose colored in cooler weather. The white long blooming flower spikes appear in June and July. Yucca filamentosa 'Color Guard' is evergreen and salt tolerant.