The CropGrowPost Event is fired once a crop block has successfully grown. It cannot be canceled, and merely serves as a notification of crop growth.

You will need to cast the event in the function header as this class:
crafttweaker.event.CropGrowPostEvent
You can, of course, also import the class before and use that name then.

CropGrowPost Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IBlockEvent

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter originalBlockState	ZenSetter ​	Type IBlockState
ZenGetter originalBlock	ZenSetter ​	Type IBlock