Trees can cause major damage to your home, garden and boundary walls. This is especially true on the Witwatersrand where most areas and soils have some clay content. Without care and control, they may cost you a lot of money and no small amount of effort to fix.
Furthermore, shrubs should not be planted too close to the masonry walls either. The building regulations specify a minimum distance of 1,2 m for normal soils and 1,5 m if you have clayey soil.
Roots can also grow beneath your foundation and lift the house or they can leach water from the ground during dry spells and sink or settle the house unevenly.
They will cause the soil to dry out and, in the case of clay soils, to shrink.
Any subsequent watering or extended rain periods will cause the clay to swell. In this way, trees and large shrubs can cause movement on clay soils resulting in damage to your home and walls.
The amount of movement depends on the percentage of clay content, the depth and extent of the root system and the efficiency of the tree to extract moisture from the soil.
When underground sewer and water pipes develop small leaks, roots will quickly take advantage of those leaks. Before you realise it you have a blocked sewer line and pools of water and sewage in your yard.