Pennsylvania Gold Medal Plants for 2020

By C StClair

Every year the Pennsylvania Horticultural Society recommends a selection of plants that they feel will be outstanding performers in the mid-Atlantic home landscape.

The selections are made by a committee of growers, nursery owners, landscape designers and other horticulturalists who have had the opportunity to observe the plants over time. They are chosen for their hardiness, pest and disease resistance, ease of growing and maintenance – as well as appearance of course.

This year, they have singled out one tree, 2 shrubs and 3 herbaceous perennials.

The tree is Carpinus caroliniana, commonly known as American Hornbeam but sometimes called Ironwood or Musclewood. It is an understory tree so its smaller size can be useful in home landscapes. It is slow growing to about  20-30 feet and has orange- yellow fall foliage. This tree is native to the mid-Atlantic.

One of the chosen shrubs is Aronia melanocarpa ‘Viking’, also known as Black Chokeberry. This native shrub has fragrant white flowers in spring that turn into glossy black berries in late summer. The berries are edible (although astringent) and can be cooked into pies and jam – or left as a food source for birds. The glossy leaves have good red fall color. ‘Viking’ is a cultivar selected for greater fruit production. This shrub grows 3-6 feet tall and wide. It can tolerate part shade, but flowering and fruiting are best in full sun.

Image courtesy of Northcreek Nursery

The second shrub is Hydrangea arborescens ‘Haas’ Halo’, a cultivar of our native Smooth Hydrangea. This shrub has large lacecap flowers with sturdy stems that don’t droop after a rain. The lacecaps can be as much as 14 inches in diameter and are sturdy enough to provide winter interest. The flower heads include both showy, sterile flowerets and fertile flowers so they provide more pollen and nectar for insects than the more common ‘Annabelle’ hydrangea. Haas’ Halo also appears to be more drought tolerant (once established) than ‘Annabelle’.  This shrub grows 3-5 feet tall and wide in part to full sun.

Coreopsis verticillata ‘Zagreb’ is a compact herbaceous perennial with a light, airy texture. The bright yellow flowers cover the plant from early through mid-summer, with a re-bloom in fall if the plant is cut back to half after flowering slows. ‘Zagreb’ is useful for the front of a border or in pots. It can tolerate poor soils and drought. It does need good soil drainage to prevent crown rot. This perennial is compact (12-18 inches tall and wide), long flowering and long lived.

The second perennial selected is Geranium X cantabrigiense ‘Biokovo’, commonly known as Cranesbill Geranium due to the shape of the seed pods. This plant is low growing and compact, about 6-12 inches tall. It flowers in spring with white flowers tinged slightly with pink. Although somewhat slow growing, it can create a groundcover over time.  It grows best in full sun to part shade. While it can tolerate some drought, it may go dormant in late summer in dry conditions. It performs and spreads better in consistently moist, well drained soils.

Although technically a woody sub-shrub, the last selection chosen is usually grown as an herbaceous perennial. Perovskia atriplicifolia ‘Little Spire’  (commonly known as Russian Sage) is a compact selection growing to about 2 feet tall versus 4 feet tall for the species. ‘Little Spire’ grows best in full sun and medium to dry soil moisture. It is drought tolerant, deer resistant and has attractive silvery foliage. The spires of blue to violet flowers bloom for a long period over the summer.

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