Pond growth is the process of a pond's ecosystem developing and changing over time. ALGA, with four letters, is a type of aquatic plant that can be found in ponds. ALGAE, with five letters, is a type of aquatic organism that can be found in ponds. REED, with four letters, is a type of tall grass-like plant that can be found in ponds. Green ALGAE, with ten letters, is a type of ALGAE that can be found in ponds and is usually green in color. All of these organisms contribute to the growth of a pond's ecosystem.