Tree Health Assessment

What does a healthy tree look like?

A healthy tree has full, normally colored leaves for its species and the season, steady new growth at branch tips, firm bark and a trunk that flares smoothly into the ground. Its crown is reasonably balanced and free of large dead sections.

Healthy does not mean perfect. Most trees carry some dead twigs, insect nibbles and minor scars. The question is whether the overall pattern is steady or getting worse from year to year. Photos taken from the same spot each season make changes easy to see.

Keep a simple tree journal. Date, photo and a line or two about leaf color, new growth and any damage is enough, and it gives an expert much more to work with than memory.

How do I check the crown and leaves?

Look up through the canopy. Thin leaves, small leaves, early color change, wilting in the middle of summer and dead branches at the top are all signs of stress. Compare with neighboring trees of the same species so you do not mistake normal variation for trouble.

Sparse growth can come from drought, root damage, insects, disease or simple old age. A single sign is rarely a diagnosis. Several together deserve a closer look.

• Leaves smaller, paler or fewer than neighbors
• Early fall color or leaf drop in summer
• Dead branches in the upper crown
• Sprouts growing from the trunk base or main limbs

What should I look for on trunk and bark?

Check for cracks, peeling bark, oozing sap, holes, fungus growing on the trunk or at the base, and hollows. Mushrooms or shelf-like growths often indicate rot inside, which can weaken the tree even when the crown looks fine.

Look at old wounds too. Some close over well, while others stay open and decay. Cankers, which are sunken or swollen dead patches in the bark, can point to disease. Take photos and keep a record.

Do not forget to check the ground under the tree. Fruiting bodies of fungus, loose bark on the soil and fine sawdust can all be clues to what is happening above and inside.

What is happening below the ground?

Roots are the part you cannot see and the part that often fails first. Look for raised or heaving soil, cut or crushed roots from digging or driving equipment, a trunk that has started to lean, and soil piled against the base.

Compaction from vehicles and livestock, changes in drainage and grade, and construction near the tree can all damage roots slowly. Damage today may not show above ground for years.

Think about what has changed in the last few years: new fence lines, a drainage ditch, a graded drive, a barn addition or a change in grazing. Root problems often trace to a change nearby that seemed unrelated at the time.

When does a tree become a hazard?

A tree becomes a hazard when it could fall or drop a large limb onto something of value, such as a house, a road, a pasture or a place where people gather. Large dead branches, deep cracks, heavy lean after storms and extensive rot are warning signs.

Do not guess when the risk is high. A certified arborist can inspect the tree and explain the risk. Remove people, animals and vehicles from the area underneath a tree you worry about until it is checked.

Large trees near your home deserve a regular look, especially after storms and heavy snow. A short walk around the yard each season, with binoculars, is a habit worth building.

How can I help stressed trees recover?

Support the basics: reduce soil compaction, keep mowers and equipment away from trunks, avoid piling soil or mulch against the bark, and water during long dry spells. Avoid heavy fertilizer unless a soil test or expert recommends it. Mulching a wide ring around young trees helps hold moisture, moderate soil temperature and keep mowers away, as long as the mulch is spread thin and kept off the trunk itself.

Prune dead or broken branches properly, and avoid wounding the tree. Ask your extension office what suits your species and soil before you buy any treatment, and be cautious of door-to-door offers.

Who can diagnose a tree problem?

County extension offices and state forestry agencies often help identify problems, sometimes from photos or samples. Certified arborists can inspect individual trees on site, usually for a fee. Local plant clinics and master gardener or master naturalist programs also help many rural owners get answers at low cost.

Bring clear photographs of the whole tree, the leaves, the bark and the base, and note when you first saw the change. Details speed up the diagnosis.

Last reviewed: November 12, 2026. Written by the Rural Farm Life Editorial Team. See our editorial policy.