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Non-Native - no significant ecological benefits are known.
Water lettuce is a floating plant. This floating plant commonly
forms large infestations which prevent boating, fishing and other
uses of lakes and rivers. Water lettuce can form dense carpets of
vegetation on the water surface, blocking sunlight from reaching
submerged plants and reducing the oxygen exchange at the water's
surface. It can also grow to form surface mats impenetrable to
swimmers and waterfowl.
Water lettuce resembles a floating open head of lettuce. Water
lettuce is a free-floating plant with many thick, spongy, dusty
green simple leaves. The leaves are dull green, covered in very
fine hairs, ridged and arranged in a spiral pattern from the center
of the plant. The leaves are 1 to 6 inches wide and have large
veins running their length. Water lettuce roots are light-colored
and feathery. Its flowers are inconspicuous.
Look for thick, soft, light green leaves (usually 6 inches in
length) that form a rosette. The rosette conceals a small female
flower and the seed-bearing fruit of the plant.
A. Once water
temperatures are around sixty degrees or warmer.
treatments are generally required.
A. It really
depends on the product you choose. For most vegetation, control
will take approximately 2 weeks however, tissue damage may be
evident within 2 to 4 days with liquid formulations. Some
products are slower acting with results taking 30 days or more to
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