06/03/2026
Every "disease" you are trying to scrub, spray, or prune off your tree bark this spring is actually a sign that your yard's ecosystem is breathing.
As trees leaf out, the trunk becomes visible, and we notice the growths. Because we've been trained to want our tree trunks to look like clean, smooth pillars of wood, we panic and buy fungicides. But these textures are the micro-forest that supports everything else. Lichen, moss, galls, and sap — each one providing habitat and food when the rest of the yard is bare.
🌫️ LICHEN forms crusty, gray-green patches on branches. It is not a parasite. It is an incredibly sensitive organism that only grows where the air quality is clean, and hummingbirds rely on it to camouflage their nests.
🟢 BARK MOSS wraps the north side of trunks in green velvet. It doesn't harm the bark; it acts as a crucial moisture reserve during droughts and shelters microscopic hunters that keep tree pests in check.
🪵 OAK GALLS look like bizarre, woody tumors or ping-pong balls attached to twigs. They are the nurseries of tiny native wasps. The mature tree easily isolates them, and they cause zero long-term damage.
🍯 TREE SAP drips are often viewed as a mess to wash away. But in early spring, before flowers bloom, these sugary resins are the critical first carbohydrate source for waking butterflies and early ants.
Before you reach for the wire brush or the chemical spray, look at what is growing. If it's on the surface of the bark, it's not an infection — it's a habitat.
The blemishes are the biosphere. Let it grow. 🌳