In the Winter Garden, 2019 Edition

Cornus_sericea_bark_Nov_MMF

Cornus sericea ‘Baileyi’ (red twig dogwood), as pictured here at the Glencarlyn Library Community Garden, is striking as a lone specimen shrub or when planted en masse or intermixed with evergreens to form shrub borders. Photo © 2019 Mary Free

Merry Christmas and Happy Holidays! Appreciating the winter garden makes for a happier all-season gardener, so this article, written by EMG Mary Free in December 2012, was worth revising and updating. 

by Mary Free, Extension Master Gardener

Our gardens may lay mostly dormant in this season, but still there are some herbaceous and woody plants with color, form, and texture that can both surprise and delight in the winter landscape.


Herbaceous Plants

As annual flowers succumb to freezing temperatures and many perennials enter a dormant period, one green plant still covers the ground in the woodlands and shade gardens: Polystichum acrostichoides. Also known as Christmas fern, its graceful, finely textured fronds often are used as a seasonal decoration.

Christmas Fern

The demonstration Quarry Shade Garden, located in Arlington, Virginia’s Bon Air Park, displays a variety of native ferns including Polystichum acrostichoides, shown in mid-December with Galanthus caucasius in bloom in the background. Photo © 2012, 2019 Mary Free.

An eastern United States native, Christmas fern grows in a circular clump with its arching fronds reaching about one to two feet high and wide. In early spring, new leaves or fronds emerge in the form of a tight spiral, shaped like a fiddlehead, amidst old fronds that remained evergreen through winter. They expand to reveal pinnae (leaflets) shaped like a socks or ear lobe swith bristly, serrated edges. By late spring, spore-containing sori appear on the underside of the upper third of fertile fronds. The non-fertile part of these fronds as well as the sterile fronds, which are narrower and more prone, remain evergreen.

Although Christmas fern prefers partial shade and moist, well-drained soil, it can tolerate more sun with enough moisture as well as drier soils in full shade. For year-round interest, grow this fairly low-maintenance fern in a woodland or Japanese garden, under trees, en masse, as contrast to shade bed perennials, or for erosion control.


Woody Plants

Now that deciduous trees are bare (except for those, like some oaks, hornbeam, and beech, with marcescent foliage—dead leaves that remain on the branches through winter), the conifers and hollies that were the backdrops of summer take center stage. Clothed in varied hues of green, their scaly, needlelike, smooth, or glossy foliage is accented with cones or berry-like fruit. However, do not readily dismiss the defoliated deciduous tree or shrub. The aesthetic quality of its bark (as well as that of the conifer) is often overlooked in favor of flower, fruit, and foliage. Yet, for one quarter of the year or more, its bark and shape are on conspicuous display.

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Though a tree may exhibit its beauty through flower and foliage, its character is revealed by its bark. Who cannot marvel at bark and branches that are smooth or furrowed or peeling or shiny or colorful or mottled or striped or contorted? For a specimen tree prominently featured in the landscape, the quality of its bark may be especially important to ensure four-season interest. So when selecting a new tree for your property, in addition to its habit and attributes (size, rate of growth, cold-hardiness, heat and drought tolerance, pest/disease susceptibility, etc.) and the site conditions (soil type and ph, moisture, sun/shade, nearby plants, etc.), be sure to take into account the color, texture, and shape not only of its foliage and flowers but of its trunk and branches too.


Trees or shrubs to consider for their unusual or stunning bark

Trees with smooth bark

Native:

    • Carpinus caroliniana, (American hornbeam), blue-gray bark remains smooth even as tree ages;
    • Fagus grandifolia* (American beech), smooth, light gray bark; and
    • Hamamelis virginiana (witch hazel), smooth gray to gray-brown bark.

    Fagus_grandifolia_in_Woods-2_Mar_ELM

    The smooth, light gray bark of Fagus grandifolia catches the eye in the woodlands of the U.S. National Arboretum. Photo © 2019 Elaine L. Mills

Non-native:

    • Fagus sylvatica (European beech), smooth gray bark. According to Virginia Tech, it is better adapted to Virginia growing conditions than the native American beech.

Trees with deeply furrowed or plated bark

Native:

  • Cornus florida* (flowering dogwood), square-plated, gray to brown bark;
  • Diospyros virginiana* (common persimmon) young, fissured, grayish-brown and orange bark; older, darker bark, described by Virginia Tech Dendrology as having “square scaly thick plates reminiscent of charcoal briquettes (very unique)”);
  • Juglans nigra, (black walnut), dark brown bark deeply ridged in a diamond-like pattern;
  • Nyssa sylvatica* (black gum), furrowed, gray bark maturing to resemble an alligator hide; and
  • Prunus serotina,* (wild black cherry), smooth bark maturing to that resembling burnt chips or burnt corn flakes.

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Trees with peeling or flaking bark

Native:

  • Betula nigra* (river birch), variable and multi-colored barks with some that exfoliate horizontally in curly sheets;
  • Hydrangea quercifolia (oak leaf hydrangea), peeling of older stems reveals the cinnamon under bark of this southern U.S. native shrub;
  • Juniperus virginiana (eastern redcedar), scented, gray to red-brown bark that shreds in long, thin strips;
  • Physocarpus opulifolius (common nine bark), old stems continuously molting in papery strips;
  • Platanus occidentalis (American sycamore), mottled, camouflage-color bark that drops with regularity along with fruit and foliage; and
  • Taxodium distichum (bald cypress), shallowly ridged and furrowed, reddish-brown bark weathers to gray and shreds in thin strips with age.

Non-native:

  • Acer griseum (paperbark maple), coppery to cinnamon bark tears into large curly sheets that stay on the tree;
  • Cornus kousa (Kousa dogwood), exfoliating mature bark, mottled tan and gray;
  • Lagerstroemia indica (crape myrtle), exfoliation reveals smooth under bark of varying colors depending on the cultivar;
  • Pinus bungeana (lacebark pine), bark mottled in irregular patches of brown, rust, green, and cream; and
  • Stewartia pseudocamellia (Japanese stewartia), exfoliating older, gray bark reveals lighter patches of cream and orange underneath.

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Trees with red or bronze stems, or bark

Betula_alleghaniensis_young_tree_with_mature_box_inset_Apr_MMF

As this young Betula alleghaniensis matures, its lustrous bark will become deeply grooved and peel in thin rolls (inset).  Photo © 2019 Mary Free

Native:

  • Betula alleghaniensis* (yellow birch), lustrous yellow to amber/bronze to silvery bark with long horizontal lenticels; mature bark deeply grooved peeling in thin rolls); and
  • Cornus sericea (red twig dogwood), showy bright red stems in winter. According to the USDA Plants Database, in Virginia C. sericea is native only in Fairfax and Fauquier counties.
The showy bark of a younger Betula alleghaniensis tree shines in the natural setting of Connecticut College Arboretum. Yellow birch is common in the Appalachian Mountains from New England to the Great Smokies. Video © 2019 Mary Free

Non-native:

  • Acer palmatum (Japanese maple), bright red to purplish twigs;
  • Maackia amurensis (amur maackia), peeling, shiny, coopery-bronze bark;
  • Pinus densiflora (Japanese red pine), orange-red stems; young bark peels in thin scales; older bark turns gray, developing plates;
  • Prunus spp., reddish to red-brown to bronze bark on younger trees;
  • Salix integra ‘Hakuro-nishiki’ (Japanese dappled willow), new stems turn red in winter; and
  • Syringa reticulata – formerly S. amurensis japonica –  (Japanese tree lilac , shiny, cherry-like, reddish-brown bark on younger trees.
Acer_palmatum_in_landscape_CW

Once the leaves have fallen, the reddish-purple twigs of this Acer palmatum add drama to the winter urban landscape in Alexandria, Virginia. Photo © 2015, 2019 Christa Watters

Trees with striped bark

Native:

  • Acer pensylvanicum (striped maple),  white longitudinal stripes on a smooth, gray-green bark that ages to reddish-brown.
Acer_pensylvanicum_by_Nelson_DeBarros_hosted_by_the_USDA-NRCS_PLANTS_Database

North America’s only native snakebark maple, Acer pensylvanicum, commonly grows in the Appalachian Mountains. The young trees display green bark with striking white stripes. Photo used with permission of Nelson DeBarros, hosted by the USDA-NRCS PLANTS Database.

Hybrid:

  • Acer x conspicuum ‘Phoenix’ (Phoenix maple), a snakebark maple with white vertical stripes on a background that turns from coral in summer to vibrant red in winter.

Non-native:

  • Acer davidii (David maple), young branches turn red in winter; older bark shiny and green with purple-red highlights and jagged white lines; and
  • Acer tegmentosum (Manchurian striped maple), white to bluish-green vertical stripes on green bark do not disappear as quickly as on other aging snakebarks.

Trees with contorted shapes

Non-native:

  • Corylus avellana ‘Contorta’ (Harry Lauder’s walking stick), curled and contorted branches.
Corylus_avellana_'Contorta'_snow-covered_Feb_JF

The twisting branches of Corylus avellana ‘Contorta’ in the Glencarlyn Library Community Garden exhibit best when laid bare in winter or silhouetted against a snow-covered background. Photo © 2019 Judy Funderburk

The next time you walk by a naked tree, stop and take a closer look. Just as flowers may tempt our noses, bark may tempt our tactile senses. You may be pleasantly surprised or even amazed by what you see and feel.


* High wildlife value according to the U.S. Fish and Wildlife Service.

Footnotes

  1. Except where noted, natives refer to those plants indigenous somewhere in the Mid-Atlantic Region.
  2. For native fern suggestions, visit Tried and True Plants/Ferns: https://mgnv.org/plants/ferns/.
  3. For native tree suggestions, visit Tried and True Plants/Trees: http://mgnv.org/plants/trees/.
  4. For native shrub suggestions, visit Tried and True Plants/Shrubs: https://mgnv.org/plants/shrubs-2/
  5. For more information: Selecting Landscape Plants: Rare and Unusual Trees, VT Publication 426-604 at http://pubs.ext.vt.edu/426/426-604/426-604.html.
  6. To identify a tree, visit: http://dendro.cnre.vt.edu/dendrology/idit.htm.
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