Some management techniques, harvesting for example, can create fragments and contribute to the spread of Brazilian elodea. Once established, Brazilian elodea can be controlled by several herbicides and appears to be a preferred species grazed by grass carp. The primary distinguishing feature of Hydrilla is the presence of tubers that form on the roots. Hydrilla also has small prickles on its leaves that give the plant a rough feel. Hydrilla is a submersed plant that is rooted in the sediment.
Hydrilla is probably the most troublesome submersed aquatic plant in North America.
It grows rapidly under very low light levels, in a variety of aquatic habitats from static to flowing water and at depths from an inch to 50 feet. The stem branches in the upper parts of the water column, forming a canopy that inhibits growth of native species and interferes with recreational use of lakes. Stem fragments are formed by harvesting operations and by boat props. Each stem piece can root and form a new plant. Tubers form on the roots in the sediment, and turions form on the stem in the water column.