Why You See Tree Trunks Painted White — and What It’s Really Protecting

The Hidden Threat: Sunscald

The biggest danger isn’t insects.

It’s sunlight.

During winter, especially on clear days, the sun can heat a tree’s trunk surprisingly fast.

Then night falls.

Temperatures drop.

The bark contracts.

This constant warm–cold cycle stresses the tree.

Over time, it causes cracking and splitting.

The condition is called sunscald.

Once the bark cracks, the tree becomes vulnerable to:

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