Its going to be great seeing what you come up with Greg!
Your window box treatment has given me ideas too Calin. I will need to make one soon, and I like the way you did it in fitting sections...
You know the even portions of each recipes of perlite, 100% Portland cement, and sifted Peat Moss is foolproof. I add a little extra Moss and Perlite or vermiculite for a little lighter pot on occasion.
I just leave them in the mold for 6 hours or so and pop them out. This is the time to drill holes or do your etchings if desired.
I spritz them down after this and cover with plastic sheeting or bags for a day. After that now I just sit them in the yard in a shady area somewhere and hose them down a couple of times a day while I'm watering and they are ready to go in not much longer then a week!
(don't believe some sites that will tell you that you can get away with sand mix. Lots of time the mix is too sandy these days and the pots will crumble.)
