Updated 5/6/2026

 

 

 

 

 

After reading Part 1 of “Plant Trees to Transform Your Landscape”, you’ve located the best spot where a tree will shade the house from brutal summer sun. Recommendations and practices presented here are based on climate and soil in the eastern part of the United States, where I live and garden, but the basic principles apply everywhere.

If your main objectives are shade, attracting wildlife, and less grass to mow, include masses of shrubs and perennials in the landscape plan as well. This article concentrates on planting trees, the dominant features in the landscape.

 

 

Native Plants vs. the Non-Natives

 

The choices offered in garden centers can be narrowed down to native species and non-native, or exotic, species. Within each of those groups are the original species and the cultivars (cultivated varieties). Developed by plant breeders, cultivars exhibit more ornamental or desirable—or just different—characteristics than the species.

Non-native plants originated in a different country or perhaps only a few hundred miles away. If the plant doesn’t occur naturally in your geographic region, it’s non-native, although some gardeners restrict use of the term to plants evolving in another country.

There are many beautiful plants, exotic to our shores, which we’ve enjoyed in our gardens. Japanese snowbell (Styrax japonica), Stewartia pseudocamellia, and the dizzying assortment of Japanese maples (Acer palmatum) are just too hard to pass up. You can compromise, if you wish, by including both natives and exotics.

To most garden center visitors, none of this matters. We buy plants that solve problems and look pretty in our yards. But, to explain the relevance of native species, I’d like to expand the subject.

 

The Benefits of Native Species

First, native plants require less pampering to get them established.

Species that evolved locally can tolerate fluctuations in weather patterns. Temperature extremes, rainfall, humidity, soil types, altitude, wind patterns, and local fauna shaped today’s ecosystems.

Second, gardeners concerned about local pollinators choose plants that foster bees, butterflies, and other animals that pollinate farm crops and wild vegetation.

Every third bite of food we consume is attributable to pollinators. But, you might make the case that since most crops are alien to this country, it shouldn’t matter whether we use native or non-native trees. But we need to consider what larval insects consume, and that’s foliage and other plant parts. Egg-laying female moths and butterflies, beetles, and other insects are very selective and seek the natives they evolved with to supply sustenance for the following generation. Thousands of species—not just bees—pollinate our farms, orchards, fields, and forests.

Incidentally, honey bees are not native to this part of the world. They will, however, forage from plants grown here, many of which are related to the plants they evolved with.

Making a Case For Single Flowers

 

 

Flowers attract pollinators, which reap the harvest of nectar and pollen. But many double- and triple-petaled flowers have lost their nectaries, stigmas, and/or pollen-tipped stamens. Photos above clearly illustrate the loss of reproductive parts in a double amaryllis cultivar. If these hybridized doubles and triples have lost the ability to reproduce sexually, they can’t make seeds. They must instead be propagated asexually, or vegetatively, by cuttings, division, grafts, or tissue culture.

The anthers, supported by filaments, bear the pollen; the male portion of the flower, collectively, is called the stamen. Female parts comprise the stigma, supported by the style, and the ovary, with its ovules, deeper within the receptacle; the female portion is called the pistil.

Not all dense flower heads are pollinator wastelands, though. Species in the Asteraceae family, for example, have flowers that normally look full. This family includes all the composites, such as aster, coneflower, daisy, dandelion, rudbeckia, and sunflower. Their dense inflorescences are composed of small florets arranged in a head, called a capitulum. But the original species also have the necessary reproductive parts. The composites are one of the most successful groups of plants and are found on every continent except Antarctica.

At a local garden center, I watched bumble bees that were quick to land on thickly-petaled hybrid red coneflowers (Echinacea). They were equally hasty in their departure! The bees stayed on the red flowers for a fraction of a second, while they lingered on the less frilly flowers of other cultivars, mining several florets in each flower for their treasure.

Pollinators waste precious energy visiting barren double-flowered hybrids. True, not all doubles lack nectar and pollen. For the pollinators’ sake, though, select more species or varieties with simple flowers. Natural selection favors plants that set seed, of course, which is why most native plants have simpler flowers.

Photos below show examples of single-flowering cultivars. If you see a boss of stamens and pistils in the flowers, those plants can probably supply pollen and nectar to the pollinators. This is a fine point, granted, but one that is critically important to populations of pollinators, given the preponderance of double-flowering hybrids at garden centers.

 

 

Third, planting a multitude of native species helps secure the future of threatened or endangered insects and animals.

In many regions, songbird populations have declined by half due to human intervention. Some have disappeared entirely. Trees and shrubs that provide shelter, nesting sites, berries or seeds, and which host insects, can help bring back the birds. Abundant biodiversity is a valid protection against the domino collapse of interdependent species.

Civilization has claimed much of the insects’ natural environments, but each of us can play a part in rebuilding habitats. Annual butterfly counts show drastic declines. Monarch butterflies, in particular, now have less territory available in Mexico, a major overwintering site, than in the past, when they migrated by the millions.

Maintaining brush piles for overwintering insects and animals will help repopulate your landscape early in the season. Hauling twigs and garden debris off to the recycling center, however, is sure death for the insects tucked inside. Fewer insects = fewer birds and other animals.

Fourth, incorporating native plants into the landscape helps keep the entire food chain intact.

Insects feeding on plants become food for frogs, toads, lizards, birds, and mammals. They, in turn, become food for snakes, hawks, foxes, and other predators. In many ecosystems, insects native to the region are the foundation on which the entire food chain is based.

A rich diversity of plant material supports an enormous number of insect and animal species. Left undisturbed, populations find a balance among themselves. On the other hand, life in monoculture, such as a lawn, is sparse. Unfortunately, countless urban and suburban neighborhoods have become dead zones with all their natural vegetation bulldozed to the ground.

As we spray, mow, burn, or build in natural environments, species will continue their rapid decline. Certainly, we need places to live and work, but we can also “give back” by planting for wildlife on our own properties, instead of continually killing it off.

Check with your state’s native plant society, native plant finders, BeeCity USA, and the local agricultural extension service for information. In addition to these sources, find a knowledgeable salesperson at the garden center or the farmers’ market for practical advice and sources of plant material. Home and garden shows might feature vendors specializing in native plants as this branch of horticulture grows.

 

Native Species and Nativars

 

 

Plant breeders have brought to the marketplace many cultivars of our native species. These nativars might have purple or red foliage instead of green, or double flowers instead of single. Perhaps they mature at a shorter height or more upright than the original species, making them a better fit for small properties.

Garden centers often stock varieties of native species, although those selling native plants might also stock the original species. By a comfortable margin, though, most of the trees and shrubs in U.S. garden centers are cultivars of non-native species. Many originated in Asia, a treasure trove of tempting horticultural novelties.

Red Leaves and Wildlife

 

 

Many trees develop red or burgundy fall foliage. Species native to the eastern U.S. with red fall foliage include sourwood (Oxydendrum arboreum), flowering dogwood (Cornus florida), black gum (Nyssa sylvatica), red maple (Acer rubrum), sugar maple (Acer saccharum), red oaks (Quercus rubra, Q. coccinea), and white oak (Quercus alba).

Beautiful fall color lures camera-toting visitors each year to the mountains, to New England, and to the Blue Ridge Parkway. The U.S. National Park Service provides an interactive map which tracks the progression of fall color.

Red- or purple-leaved cultivars sporting this color all summer are in high demand at garden centers. But if the point of planting trees and shrubs is partially to benefit insects and animals, we want to be sure the plants we choose will attract them. Each plant species has a particular menu of chemical compounds in their tissues that either attract or repel wildlife. Organisms evolved a tolerance for these compounds…or they didn’t!

Purple and red leaves often repel insects due to their high levels of anthocyanins, the red pigments in the foliage. So, that defeats the purpose, doesn’t it? Not necessarily; these trees might have had green leaves that hosted insects before leaves turned red. Or insects simply tolerate the red pigments.

Oak trees support huge numbers of insects, birds, and mammals at various times during the year. That’s why oaks are called “keystone species” in many places around the globe. This one genus—Quercus—hosts hundreds of species of moths and butterflies throughout its range, although many of these trees turn red in autumn.

Before planting a cultivar that stays red all season, find out if insects, such as mature caterpillars, will eat the leaves. This indicates that it could host insects for their entire life cycle. If all the larvae are tiny, however, when some larger individuals are expected, most might have crawled off to greener pastures. Or they could have died off.

Planting some red-leaved trees is okay if you have other trees available for the insects. Avoid overplanting the red cultivars, which might detract from the rest of the landscape. Ultimately, though, it’s your property, so you can plant what you please.

If bees spend time working a flower and don’t fly off immediately after landing, that plant could be a good choice. Similarly, holes in the leaves indicate that the plant can host insects. Resources at the local university’s entomology department or botanical garden might have information that could help you choose plants that support wildlife.

The Untold Story

(This section added 10/6/21.)

I’ve been packing for the past couple of weeks, preparing for a move to a rural location in northern North Carolina. I took a break from the work and sat on the deck, listening to the birds and watching insects.

One of those sounds was the hum of an approaching ruby-throated hummingbird, the only species summering in this area. Four feet away, and only 3″ long, this tiny bird landed on a twig of the potted native dogwood tree, sitting right next to me.

He then hovered near the flower buds (photo, above, with last year’s fall color), and I could see his tongue working the buds, one after another. These buds are tightly closed, yet he found something worth gathering, despite the presence of other flowers nearby.

Within a minute, another hummingbird arrived for the same reason, apparently. The two tiny birds fought for feeding rights, and the second one flew away after some impressive aerial maneuvering among the twigs. The first hummingbird continued searching for hidden sustenance held inside those buds. I’ve never seen this behavior.

My point is this: there’s much about the natural world that remains unobserved—a mystery to us—perhaps lending more credibility to the importance of using native plants in our gardens.

 

Headings

Page 1: Are You Ready To Plant Trees?, Native Plants vs. the Non-Natives (The Benefits of Native Species, Native Species and Nativars, Red Leaves and Wildlife, The Untold Story)

Page 2: Deciduous Trees For the Eastern U.S. (The Hollies, The Curious Case of Crape Myrtle, Evergreens), Good Looks, and Before Planting Trees, Soil Preparation For Trees (Slope, Outline the Bed, Heavy Clay, “How Deep?”

Page 3: Adding Amendments, Organic Matter, and Time To Plant Trees (Trees In Pots, B&B Trees, Backfill, Edge, Mulch, And Water)

 

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