If they are woody plants here are some suggestions on pruning.
Tree Pruning
http://www.treedictionary.com/DICT2003/tree_pruning
--
Sincerely,
John A. Keslick, Jr.
Consulting Arborist
http://home.ccil.org/~treeman
and
www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.