Duckweed (Lemna minor)

Lemna minor, commonly known as Duckweed is a very small, floating plant. It spreads freely and is usually found growing in colonies that can cover quite large areas of still water.

Height : Grows 0.25 to 0.25 feet.
Light : Prefers full sun to part shade.
Humidity : Requires moderate humidity.
Uses : Free floating aquatic perennial for water gardens or ponds.