Nobody wants a tree too close to his
or her living space. This is not only a Fengshui concern, but also an
expression of common sense. Having a tree blocking in front of the door will
create a blockage in Fengshui energy absorption, which might in time reflect in
respiratory problems for people living in the house.
When the tree is to the left of the front door (as looking from inside the door), this can create auspicious Fengshui green dragon energy, especially if the tree is tall and lush, and has a powerful presence. This Fengshui is good for the all the males in the family.
If the tree is to the right (as looking from inside the front door), this create a Fengshui white tiger energy. The yang/masculine energies are then weaker than the yin/feminine energies. On a practical level, it might mean that a male living in a house with this imbalance might find himself lacking some supportive energy.
The Fengshui cures will depend on specific details of the tree location. If the tree is right in front of the main door, you can overcome the problem by creating a strong Fengshui front door.
If the tree is to the right, you can consider of lowering the tree height, so that it creates more of a balanced energy for the house. Always remember, it is Fengshui wise when the left side of the house is slightly higher than the right side.
In any case, though, you will have to take good care of the tree and trim some of its branches, if necessary, to be sure they do not create Fengshui attacking energy, directed at your living space.