How to Identify a Tree

Bark, leaves, branching pattern, and the 4 things to look at before calling an arborist

Why Identification Matters

When you call an arborist and say 'I have a tree that needs trimming,' the first thing they need to know is what species it is. A red oak gets pruned differently than a silver maple. Oaks can only be pruned in winter in areas with oak wilt. Silver maples have weak wood that needs specific structural pruning. Conifers don't respond to heading cuts the way deciduous trees do.

Knowing your tree species also tells you what problems to watch for. If you have ash trees, Emerald Ash Borer is an immediate threat. If you have Norway maples, you're dealing with an invasive species with shallow roots that's heaving your sidewalk. If you have Bradford pears, you have trees that are structurally guaranteed to split within their first 20 years.

You don't need to become a botanist. You need to identify the 3-5 species on your property well enough to research their specific care needs and communicate with your arborist.

Start With the Leaves

Leaves are the fastest identification method during the growing season. Look at three things:

Leaf shape. Is it a simple leaf (one blade per stem) or compound (multiple leaflets on one stem)? Maples, oaks, and beeches have simple leaves. Ashes, walnuts, and locusts have compound leaves. This alone cuts your possibilities in half.

Leaf arrangement. Pull a twig and look at how leaves attach. Opposite arrangement (two leaves directly across from each other) means maple, ash, dogwood, or horse chestnut. Alternate arrangement (leaves staggered along the stem) covers most other species: oak, elm, birch, cherry, beech.

Leaf margins. Smooth edges suggest beech or magnolia. Toothed edges suggest elm, birch, or cherry. Lobed leaves with deep indentations are oaks and maples. The specific lobe shape, depth, and number of points narrow it further.

For conifers: count the needles per bundle. Two needles means a pine species like Austrian pine. Five needles means white pine. Single flat needles are hemlock, fir, or yew. Scale-like foliage is arborvitae, cedar, or cypress.

Bark Tells the Story in Winter

When leaves are gone, bark is your primary identification tool. Each species has characteristic bark that changes predictably with age.

Smooth gray bark that never furrows: American beech. This is one of the easiest winter identifications. No other common tree maintains smooth bark at maturity.

White peeling bark: paper birch or sycamore (sycamore peels in patches revealing white, green, and tan underneath).

Deeply furrowed with flat-topped ridges: red oak, white oak, or elm. Red oak has ridges with shiny strips between furrows. White oak has lighter, shaggy bark. Elm has alternating light and dark layers in the furrows.

Scaly plates: maple species. Sugar maple develops long, vertical plates that curl outward at the edges. Red maple has smoother, grayer plates.

Diamond-shaped patterns: young ash, young walnut.

Puzzle-piece plates revealing multiple colors: sycamore or London plane. Unmistakable.

Branching Pattern and Form

Step back and look at the overall shape of the tree, especially in winter when you can see the branch structure.

Vase-shaped with arching branches: American elm (though most are gone from Dutch elm disease), zelkova, or Japanese elm.

Broad and spreading with heavy horizontal limbs: oak species, especially white oak and bur oak. These trees are wider than they are tall at maturity.

Upright and oval: sugar maple, red maple, tulip poplar. These trees have a strong central leader with branches angling upward.

Weeping form: weeping willow (obvious), weeping cherry, weeping beech.

Pyramidal or conical: most conifers when young. Douglas fir, spruce, and fir maintain this shape. Pines become more irregular and flat-topped with age.

Irregular and open: most mature trees that have been pruned over decades. The natural form gets modified by storm damage, pruning history, and competition for light.

The Quick ID Checklist

Before you call an arborist, answer these four questions about each tree on your property:

Deciduous or evergreen? If it drops all its leaves in fall, it's deciduous. If it keeps green foliage year-round, it's evergreen (could be a conifer or a broadleaf evergreen like holly or magnolia).

Simple or compound leaves? Pull one leaf. If it's a single blade, it's simple. If there are multiple leaflets on a single stem, it's compound. If compound: how many leaflets? Where they attach (opposite or alternate)?

What does the bark look like? Take a photo of the bark at chest height and at the base. These are often different. This is the most useful photo to send an arborist.

What's the overall shape? Tall and narrow, broad and spreading, or irregular? This plus the bark and leaf information is usually enough for an arborist to identify the species from photos alone.

If you want a definitive ID, download the iNaturalist app. Take a photo of a leaf and the bark. The app's AI identification is remarkably accurate for common species and connects you to a community of botanists who can confirm unusual identifications.