Currently, there is an enum or other class to handle the growth state for all other plants - Crops, Cocoa, etc. There isn't one, however, for Nether Wart, which means that you have to use raw byte data to handle these instead of a formatted name.
Associated JIRA Ticket - https://bukkit.atlassian.net/browse/BUKKIT-1599
This needs usage.
Alright, added usage.
Is this covered in the current version, or is it still relevant?
Also, has no ticket.
Updated for 1.5
Add an enum for Nether Wart growth stages. Adds BUKKIT-1599
Added in ad0ccae