1. Dividing An "Arrowhead Plant" (Nephtitis) Take the plant out of container and look for separate clusters of plants or stems with healthy root section. Carefully, divide the sections with your hands and separate from the roots with a sharp knife. Place the division in a container that is slightly larger than the root spread. Secure with more potting soil and water sparingly until section gets established and new growth appears. Plant should root within 3-4 weeks.