Large trees shouldn t be closer than 20 feet to a home. This is because an extensive root system and tree stump are enough to form a highway for termites directly to the home. Some experts contend termites may be too occupied munching on the tree to bother with another food source, but I would rather not take the chance. Having a tree too close to the house can also wreak havoc with the roof and gutter system thanks to the leaves, twigs and limbs. Mulch can also create a huge problem and attract termites.
Most mulch is composed of shredded wood and bark.
It is a perfect food source for termites. When the ground settles around a house, many homeowners refill this area with more mulch. This not only provides food for the termites, it also creates a low slope around the foundation, funneling water directly towards the house instead of away from it. This causes water infiltration problems in the foundation and basement. A positive slope away from the foundation should be maintained.