ar-con - Cody Note - What varieties of Hybrid lily did you order? Whenever you see the lily patch getting too big for your needs, just hit the outside edges with a glysophate mixture and it will adequately trim back the size of the bed for patch of lilies. You will not regret planting hardy hybrid lilies for some fish habitat. Note that turtles can chop off the new leaves of growing lilies. Geese might also cut lily stems. Muskrats and nutria can eat lily roots. Grass carp will prevent newly planted lilies from getting established. You may need to take precautions if any of these factors are present.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management