Plastic plants are a popular alternative to real plants for several reasons. They require almost no up-keep, no oxygen, no fertilizer, and they can be placed in both salt water and freshwater aquariums! They will not drop leaves which can clog your filter and are much easier to clean than real plants.
They can be placed anywhere in the aquarium with no need for bespoke lighting and look very life like, plus they pose no risk of carrying parasites or snails! A wise purchase all round!