Rhizomes are sold in pairs. For varietal characteristics, click here. Plant rhizomes (a cutting from underground stems) of the female hop plant to grow your own hops. Hops are perennial plants that spend winters dormant underground before sending up new shoots each spring which can climb from 10 to 30 feet through the early summer, yielding sticky ripe green aromatic flowers in the late summer. The flowers are used fresh for immediate brewing, or dried, vacuum-sealed, and cold stored for later use.