Removing established trees
We have two established pine trees behind the house, close to our garage and on a clay slope. (See photos) They put the greenhouse and a vegetable plot on the upper garden in the shade for a good part of the day, the roots are visible throughout the banking, and are lifting the paving stones at the foot of the banking. (Not to mention the constant dumping of needles, cones, seedlings etc) We plan to have them professionally removed, but I wonder about the stability of the banking once the roots begin to die. We'd probably put in a retaining wall in the fullness of time, but how long might it be before the removal of the trees began to affect the banking? .
Any thoughts welcome.