after reading this thread i was very excited about the idea, and now i found the perfect pot.
i did the experiment, and it works great, i filled it with water and let it sit for a night, the next day it still had more than half the water, the outside was all "sweaty", and the clay felt very cool compared to the room temp.
now... i have a couple of doubts; if i fill it with rocks and then with the water ¿will it be fresher?¿will the water last longer?¿will create a suitable enviroment for fungus?, and the second is about the fertilizer: ¿if i fill it with water+fertlizer will it work or will the roots get burn?or should i prepare it a little weaker than the normal?
sorry about all the questions, and the bad english