Hanging from your oak tree are what appear to be tiny green apples. Unfortunately, they're not edible. Fortunately, they're fascinating. Oak apple galls form when a tiny gall wasp lays an egg in developing oak tissue. The tree responds by growing a round protective chamber around the larva, creating the familiar "oak apple." These galls start out green and soft before drying into brown papery spheres. While they may look alarming, they're mostly harmless and rarely cause sign

Tubakia leaf spot is a common fungal disease that affects many species of oak trees, particularly during periods of warm, wet weather. While often considered more cosmetic than life-threatening, repeated infections can contribute to stress and reduced vigor in susceptible trees. Symptoms typically appear as small brown to reddish spots on leaves that gradually enlarge over time. Many lesions develop dark centers with lighter halos, giving the foliage a scorched or blotchy app

When it comes to landscape pests, some of the most damaging offenders are also some of the smallest. Meet the lace bug—a tiny insect that may look delicate and harmless, but can leave your favorite ornamental plants looking tired, stressed, and unhealthy. Named for the intricate, lace-like pattern on their wings, lace bugs spend most of their lives hidden on the undersides of leaves. There, they feed by piercing leaf tissue and sucking out plant sap. As they feed, they destro

Powdery mildew is a common fungal disease that affects a wide range of trees, shrubs, and ornamental plants throughout the growing season. It appears as a white or gray powder-like coating on leaves, stems, and new growth. While it is rarely fatal to mature trees, untreated infections can weaken plant vigor, reduce photosynthesis, and negatively impact overall appearance and health. This disease thrives during periods of warm days, cool nights, and high humidity. Unlike many

Whiteflies are easy to recognize because when disturbed, they erupt from leaves like a miniature white snowstorm. These tiny insects gather on leaf undersides where they feed on plant sap. Like aphids, they produce sticky honeydew that encourages black sooty mold growth. Heavy infestations can cause yellowing leaves, reduced vigor, and premature leaf drop. The good news is that nature often lends a hand. Beneficial insects like lady beetles and lacewings help keep whitefly po

Not all tree problems start above ground. Some of the most damaging threats are hiding beneath the soil — and Phytophthora is one of the biggest troublemakers. Although often called a fungus, Phytophthora is technically a water mold. It thrives in overly wet, poorly drained soils where tree roots struggle to breathe. Once established, it attacks the fine roots responsible for absorbing water and nutrients. Ironically, trees suffering from Phytophthora often look drought-stres

When most people think about property maintenance, they picture mowing the lawn, trimming shrubs, pulling weeds, or spreading mulch. And while all of those things matter, there’s one part of the landscape that is often overlooked despite being the most valuable living feature on the property: The trees. That’s always seemed a little backwards to me. Think about the average maintenance routine around most homes. Lawns are mowed every week like clockwork. Shrubs get shaped and

If you’ve ever looked at a tree trunk and noticed patches of gray, green, blue, or even pale yellow growing across the bark, you may have wondered if the tree was sick. Good news — in most cases, those strange crusty growths are lichens, and they’re usually completely harmless. In fact, lichens are some of the most fascinating organisms in nature because they aren’t actually a single organism at all. They’re more like a tiny living partnership. A lichen is formed when a fungu

Now we’re getting into the really fascinating part of tree biology — the hidden underground universe known as the Soil Food Web. At first, the name sounds like something pulled from a graduate-level science textbook, but the idea is actually pretty simple: Healthy soil is alive. Very alive. Beneath every healthy tree exists an entire underground ecosystem made up of roots, fungi, bacteria, insects, earthworms, protozoa, mites, water, oxygen, minerals, and countless microscopi

Have you ever stood beneath a massive oak tree during a storm and wondered, how does this thing stay standing? After all, a mature tree can weigh several tons, endure strong winds, heavy rain, lightning, drought, and decades — sometimes centuries — of environmental stress. Yet somehow, trees remain upright. The answer lies in one of nature’s most remarkable engineering systems. Most people assume a tree stands because of a large “tap root” buried deep underground. In reality,