Giant Duckweed - Spirodela Polyrhiza - 20+ Live Floating Plants for Freshwater Aquarium/Pond. This plant is about 5-10 time bigger than the common duckweed. HOME GROWN - NO CHEMICAL USED. Fresh water, easy to grow and maintenance. Buyer is responsible for knowing local laws regarding acceptable plants for import in your state. If plants are damaged or dead on arrival, you must contact us same day as shipment is received and provide clear photos of damaged plants.