How are Hostas measured?
Hostas are measured by their root size. A heavier, larger root system allows the Hosta to gather more water and nutrients from the soil. Imagine all those roots like straws sucking up water and nutrients.
The more 'straws,' the more benefits the Hosta can get out of the soil. This helps the plant establish its roots more quickly the first year. Once the roots are established, every year you will enjoy a stronger, more beautiful Hosta that boats more foliage and flowers.