Fall: Time for Planting Trees and Shrubs

By Edie Parnum

I thrust my spade into a patch of my lawn.  It’s fall, and I’m planting a 4-foot Chestnut Oak.  As I dig, I imagine this young tree next spring with its new green leaves.  Even as a young sapling, it will host insects and birds.  Looking into the future, I imagine this stately native tree a century from now.  It has given life to thousands of birds and other animals.

Edie planting a Chestnut Oak (Quercus prinus) sapling. Photo © Barb Elliot

My neighbors, I’ve noticed, aren’t thinking about spring.  They are clearing their yards of leaves and the dead vegetation from last year’s ornamental plants.  They are putting this unwanted garden debris out on the curb along with the cocoons and eggs of next year’s insects. They are getting ready for winter. Fall is the best time for planting trees and shrubs, any time before the ground freezes. During the autumn rains, the new plants aren’t asleep. They’re putting energy into their roots for a spurt of growth next spring.This fall, as usual, I will plant several trees and shrubs.  When I bought this ¾-acre property five years ago, it was mostly grass with just a few trees, mostly non-natives.  Since then I’ve planted 39 native trees and 45 native shrubs. It’s still not enough.

I keep planting native woody plants because they support wildlife.  Certainly non-native woodies offer fruits birds will eat—witness the bird-spread proliferation of invasives like Multiflora Rose, Burning Bush, and Japanese Barberry.  Natives, however, offer fruits of optimum size and superior nutrition. The fruits of the dogwoods, blueberries, winterberries, viburnums, spicebush, and sassafras I’ve planted ripen just in time to nourish hungry migrating birds in fall. Now in late October most of the berries are gone—consumed by thrushes, catbirds, mockingbirds, waxwings, and warblers.

The main reason I plant native woodies, however, is for the caterpillars and other insects these plants support.  I’m inspired by Doug Tallamy, Professor and Chair of Entomology and Wildlife Ecology at the University of Delaware.  His research shows

The caterpillar of the Spicebush Swallowtail butterfly uses Spicebush or Sassafras as its host plant. USFWS Photo by Ryan Hagerty.

that native plants host 29 times more of the native insects essential for our birds. After all, 96% of terrestrial birds feed their young exclusively insect food.

This year to augment what I’m already growing, I’ll plant ten small trees and shrubs.  I’m planting the Chestnut Oak, Quercus prinus (according to Tallamy, oaks host 534 species of caterpillars); American Elm, Ulmus Americana (hosts 213); and Pawpaw, Asimina triloba (host plant for Zebra Swallowtail butterfly, a species I covet for my yard butterfly list).

Planting a tree or shrub is easy.  For my Chestnut Oak and the other trees and shrubs, I don’t need to dig a huge hole.  I make my hole only as deep as the soil in the plant container and twice as wide.  After putting the plant into the hole, I make sure the soil line of the plant is level with the ground. Then I use the soil that was removed from the hole to fill in around the plant.  Because my oak is a local native adapted to our soil, I am not tempted to add special topsoil, fertilizer, or any other enrichment.  That would stimulate fast but weak growth.   A hole filled with artificially enriched soil encourages the roots to stay confined rather than to reach into the ground below for nourishment.  Next, I push down on the loose dirt with my hands, but avoid stomping on it with my feet.   I spread a one-inch layer of my compost (last year’s leaves and garden debris) on top to provide some extra humus not available in the turf grass.  Then I give my oak a good watering.  That’s it for this tree.  I’m ready to plant more.

Three-year-old Black Gum (Nyssa sylvatica) with cage to prevent deer browse. Photo © Edie Parnum

Newly planted trees and shrubs may need extra water.  During any week without significant rain, I put a leaky watering can next to each plant and let the water drip slowly into the soil.  A 1-2” layer of mulch will help retain the moisture, but I never let the mulch touch the trunk.  Once established, these woody plants, situated appropriately for light and moisture, should thrive without any additional help from me.

The trees and shrubs I plant are usually small.  They are cheaper and suffer less transplant shock than a big tree or shrub.  These smaller saplings start to grow more quickly and in a few years usually out-compete larger nursery stock.  To save money, I also frequently transplant volunteer trees and shrubs in my yard to more appropriate locations.  Some of my shrubs—virburnums, for instance—send out shoots that I dig up and plant elsewhere.  I also accept gifts from my native plant gardening friends.  As I say, there’s always room for more.  Anyway, I’m not growing ornamental specimens.  The plants can touch each other and offer extra shelter, just as they do in the wild.

Nannyberry (Viburnum lentago) – flagged shoots are ready to transplant. Photo © Barb Elliot

My trees and shrubs are still small, but they already support birds and other wildlife.   Next spring I’ll see warblers and other hungry migrants eating caterpillars on the leaves of my native woody plants.  The remaining areas of grass are begging to be planted with additional native trees and shrubs.  Next fall I won’t resist planting more.

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For Doug Tallamy’s list of woody plants supporting butterfly and moth caterpillars, click here.

 Trees and Shrubs on  Edie’s Property
Botanical Name Common Name Wildlife Value
Trees
Acer rubrum Red Maple L, F
Aesculus pavia Red Buckeye L, N
Amelanchier canadensis Serviceberry/ Juneberry L. F
Asimina triloba Pawpaw L, F
Betula lenta, B. nigra Sweet Birch, River Birch L, F
Celtis occidentalis Hackberry L, F
Cercis canadensis Eastern Redbud L, N
Cornus alternifolia, C.florida Pagoda Dogwood, Flowering Dogwood L, F
Ilex opaca American Holly L, F
Juniperus virginiana Eastern Red Cedar L, F
Liriodendron tulipifera Tulip Poplar L, N, F
Magnolia virginiana Sweetbay Magnolia L
Nyssa sylvatica Black Gum/ Tupelo L, F
Pinus strobus Eastern White Pine L, F
Prunus serotina Black Cherry L, F
Quercus   alba,Q. coccinea, Q. pinus, Q. rubra White Oak, Scarlet Oak, Chestnut Oak, Red Oak L, F
Sassafras albidum Sassafras L, F
Tsuga canadensis Eastern Hemlock L,F
Shrubs
Aronia melanocarpa. Black Chokeberry L, F
Clethra alnifolia Sweet Pepperbush N
Cornus racemosa, C. amonum Gray Dogwood, Silky Dogwood L, N, F
Hydrangea arborescens, H.   quercifolia Wild Hydrangea, Oakleaf   Hydrangea N
Ilex verticillata Winterberry Holly F
Myrica pensylvanica Bayberry L, F
Rosa virginiana Wild or Pasture Rose L, F
Sambucus canadensis American Elder L, F, N
Vaccinium corymbosum Highbush Blueberry L, F, N
Viburnum   dentatum, V. lentago,V. nudum, V. prunifolium Arrowwood Viburnum, Nannyberry,   Possumhaw,  Black Haw L, F
L   = Leaves support moth and butterfly caterpillars and other leaf-eating   insects that are eaten by birds
N   = Nectar for hummingbirds, butterflies, and other pollinators
F   = Food products such as berries, seeds, nuts, buds, and pollen for birds,   mammals, and pollinators

Places to buy native plants: