Ok the basic idea of this plugin is that if you hit a piece of fertile land with a hand of lime green dye. You make a sapling appear that is the potato plant. Then after a while a couple of the dirt blocks underneath will turn to diamond blocks. (I will re-skin as potatoes as all members of the server use the servers texture pack.) Maximum 3 potatoes from each plant, and it must me dirt to replace. Could also the name of the block created be changed to potatoes. When eaten the potato will grant 25% more health of all foods eaten within 10 seconds of eating the potato.
The sapling would just be there to signify that there is something there. If could even be a fern. Thanks for the interest.