Definition: Rhizomes are horizontal underground stems that strike new roots out of their nodes, down into the soil, and that shoot new stems out of their nodes, up to the surface. This rhizome activity represents a form of plant reproduction. The irrepressible nature of much of the vegetation you'll find on invasive plants lists is due to the vigor of the rhizomes of these aggressive plants.
Common Misspellings: rizomes
Examples:Despite their pretty little bell-shaped flowers, which are quite aromatic, many gardeners consider lily-of-the-valley plants problematic due to their invasive rhizomes.