The listing, Live aquarium plant, Anacharis (Elodea), easy to grow has ended.
This is a great plant to have in your freshwater aquarium.
It is easy to grow. It will grow free floating in the aquarium or you can plant one end and it will take root. You can break a piece off and it will start growing as a new stem. I've had a piece as short as 1/4" grow into a several foot long plant that I let grow almost like it was a moss.
You will get THREE pieces of this plant, anywhere from around 4-6" in length. I'm not going to use a tape measure but it will be close to that. You can bunch them together in gravel or a small pot with dirt and it will create a beautiful filler item in your aquarium. Or plant the 3 pieces separately, or leave them free floating. You have several options.
Live plants are good at getting rid of nitrates and help to prevent algae.
This plant will grow in almost all light conditions, but the brighter the light the faster it will grow.