Pruning. Pruning shall include the removal of dead or diseased
wood, wood infested with insects, weak or structural defects in the
wood, excessive suckers and shoots, and any irregular or damaged growth.
All plants shall be inspected periodically to determine if pruning
is necessary. Care shall be taken to prune flowering trees and shrubs
properly during the dormant season or as recommended by correct horticultural
practice. Evergreen shrubs shall only be pruned immediately after
flowering. Shrub material shall not be sheared as individual plants,
rather it shall be pruned in natural, massed forms to enhance the
plant's natural growth form. Root pruning of all trees adjacent
to curbs shall be undertaken as necessary to prevent heaving of the
sidewalk/curb by excessive roots. Care should be taken not to prune
a root system in excess of 1/3 the diameter of the tree per year.
If necessary, a Certified Tree Expert should be consulted concerning
the pruning of tree roots.