A rhizome is a piece of a hop plant that will sprout roots when planted, and it's what you will need to purchase if you want to add hops to your garden. Rhizomes are available from most online and local home brew shops in the spring.
More recently they have become symbolic of sinister things. A snake ring worn on the first finger suggests this is an egotistical person and they are using the snake to enhance their status. A snake ring on the second finger suggests this is a materialistic person and they are using the snake to enhance their wealth.
The snake is associated with the Moon because of its ability to change or renew its skin, which is similar to the Moon's waxing and waning. Both the Moon and the snake are associated with immortality, and the legendary soma drink (which bestows immortality) is brewed from the Moon tree.