Water lettuce plants for sale, size of plants range between roughly 3-4 inches in size. Nutrient Filtration: Their long, feathery root systems absorb excess nutrients and nitrates, starving algae. Shade and Cover: Broad floating leaves shade the water, cooling the pond and making fish feel safe from predators. Habitat: The roots provide spawning grounds for fish and a safe nursery for fry. *Sometimes koi will nibble them! For ponds only. None edible. Pick up from Morley in Leeds. *Postage available for orders of 10 or more plants - £4.65 next day delivery*