Want a fast growing, unique looking plant that will help filter your water? Check out Water Hyacinth. This stuff grows like crazy. In fact, it grows so quickly that it is considered an invasive species in WA, WI, IN, and Florida. What I like about it is that it also looks pretty crazy too. It has a different looking little bubble that grows above it along with a spoon like leaf on top of that. If your pond needs some fast floating cover, water hyacinth is your answer. You get one big 10-12 inch clump of it per order.