Vines are destructive to mortor joints as they penetrate the mortar and expand as they grow. The leaves emits moisture and block sunlight.
The lower 2 feet of any masonry surface is vulnarable to water damage from deflected rain water and moisture emitted from plantlife and snow.
This is a clear example of how plantlife emits moisture.
Notice how the only bricks spalling are in front of the bushes.
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