HOW this project started. I have a friend who wants a culinary herb garden in a small apt balcony and CCR's are very strict (please no need to comment on the CCR's, it is what it is and we got a colored concrete/hypertufa approved) since Concrete poters are too heavy we are making pots called Hypertufa basically its 1 part Portland cement 1 1/2 parts sphagnum peat moss 1 1/2 parts perlite and looks like a concrete planter or any other shape you want to make it WHY I NEED SOME HELP THINKING THIS THRU I also wanted to make them self watering but I am concerned that the cement will rot out holding water. (I would like to use an inline watering system that you fill the bucket once a week and it waters all the pots, I have this part figured out) FYI I can form the hypertufa around any pot shape but I was trying to avoid having to buy plastic pots and forming the hypertufa around them. What I don't have figured out is how to line the pots so the cement doesn't degrade so rapidly from holding water. I could use plastic but with auto watering you need 3 holes, one at waterline level so you don't over fill the water basin, 1 for the incoming water, 1 hole for oxygen/air so the water doesn't go bad.) If I use a heavy plastic then the the holes still get water and I think the cement will go bad quicker. any suggestions for keeping the moisture from the hypertufa and still having self watering pots?