A very popular plant that can be found at Kaelupulu pond is the sedge family (Cyperaceae). It's an introduced plant. One way to tell sedge from regular grass is to feel its stems. If it splits apart it's sedge, if it doesn't, it's regular grass. Another way to tell sedge from regular grass is to see if the stems are upright and the leaves are shiny.

The sedge also has flowers. They are yellow, purple, or green in color. Some countries make sedge into mats, hats, chair cushions, and baskets. All these products of the sedge grass are made by weaving it tightly together. The sedge family can be found in fresh and saltwater habitats throughout the United States.