Vegetation growth on buildings

I always do the same. As the plants grow (usually vines), they send out roots to hold the building. These tend to find soft spots, such as soft lime mortar beds. Roots go in and two things happen: the roots grow and cause cracks, and water gets in. If you're in a freezing climate, this can cause water to seep in, freeze, and blow out the joints. Or water can just get into the wall, leading to interior moisture problems, etc.

Architects and vertical gardens:



I am not a fan.

I like trees but not the ones that grow out of walls.

I have been involved in some projects where we are intentionally going for that look. what the most appropriate thing to do is, to create a mesh/grid for which the vines can grow. this should be mounted well proud of the exterior face of the building. there should be access for a maintenance man to access the area, and access the back portion of the "green screen" with a trimmer to cut out any roots that are trying to grow back to building.