Reeds (Phragmites australis) grow 6 to 12 feet tall with long, sharp, bluish-green leaves. They work well as a forage for cattle and horses and as erosion control. They grow throughout North America and are actually considered noxious weeds in some states. Reeds grow from rhizomes and will thrive with little care after planting. Knowledge of how to plant the rhizomes will help you produce a plant that can thrive in marshy areas.