How about a contest where everyone has to start off from seed together, only thing is no nutrients or anything plant food. you can only use things from around the house, i.e. coca cola olive oil or whatever
I like that ng we could call it the grocery store grow. Only products from a grocery store would be allowed. Like molasses, chewing tobacco (for a good way to kill bugs), etc.
How about the most weirdest plant like a deformed one! you know like a plant without a growing shoot thats still growing. how weird cud that be lol lol lol.....................