AntiCactus

AntiCactus is a simple, performant, and open source utility plugin that allows server owners to prevent players from creating "solid-state" cactus farms

About
Solid state cactus farms are farms with no moving parts. This makes them incredibly easy to build, and easily tileable/scalable, making massive farms very simple to make.
They use cactus's mechanic of breaking when next to a block to instantly harvest upon growth. While a small amount of these farms is acceptable, many players build massive farms with the goal of selling mass quantities of cacti for easy money. These massive farms also may have the side effect of being laggy, due to the amount of block update events and item entities being created.

AntiCactus prevents this by halting cactus growth if the cactus appears to be located in an auto-farm. The way this is determined is by checking the surrounding blocks and verifying that the cactus will not break immediately after growth. AntiCactus will not interfere with normal cactus growth, allowing manual cactus farms to be used.

Installation

1. Place the resource in your plugins folder
2. Restart your server
3. Done!

Demonstration