There are two entities an empty pot and a seed.
When you drop the pot on the seed it starts to grow and when it is has a white outline it is ready to harvest.
When you harvest you will recieve an empty pot and 1 bag of weed.

You require durgz mod which is here http://www.garrysmod.org/downloads/?a=view&id=89712

These are only useable for sandbox the darkrp version is here http://www.garrysmod.org/downloads/?a=view&id=99724

Feel free to use this however you wish.
I do not claim credit on the models. Which are here http://www.garrysmod.org/downloads/?a=view&id=68156 <----These are included but durgzmod is not.


Facepunch Thread: http://www.facepunch.com/showthread.php?p=22900579#post22900579

Installation Is In The File!
Enjoy!