We took a field trip to a garden store where we saw lily pads, bamboo, water hyacinth, and papyrus plants. We talked about the different strategies that the plants use to live in water such as: floats, roots that anchor, broad leaves with lots of surface tension, etc. We brought some water hyacinth home to add to our tank of minnows.
Materials – either none (if you want to just make it a field trip), or a few aquatic plants of whatever is available and a container of water.