What is a Rooter ? - The Brass Butterfly. The question I get asked most frequently is "What is a Rooter?" A "Rooter" is the word we use for our vases. Our vases propagate new plants from healthy existing plants. Using our "Rooter" vase and fresh spring water you can easily grow various plant clippings. Our hand-blown glass rooter vase is perfect for propagating; it has a small neck to keep the water aerated and your plants in place. So, next time you hear the word "Rooter" you will know it stands for a Brass Butterfly propagation vase.