Existing flora. The subdivider shall make every effort to protect
and retain all existing trees, shrubbery, vines, and grasses not actually
lying in public roadways, drainage ways, building foundation sites,
private driveways, soil absorption waste disposal areas, paths, and
trails. Such trees are to be protected and preserved during construction
in accordance with sound conservation practices, possibly including
the preservation of trees by well islands or retaining walls whenever
abutting grades are altered, pursuant to a landscaping plan filed
by the subdivider.