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cement wall growing media filled all the cross through out from bottom to top, so no individual cell. i use a concrete made kit for installing this wall and both side can be use for planting . and i water the plant by hand with garden pipe , sure we can also put on the top a drip pipe for irrigation also because one cavity from bottom to top just growing media like cocopeat and compost.
here you go Sally ---just make a u-haul trip to the grocery store & pick up a bunch 0f carts--cause there FREE you know :P,,,,anyways,THEN, after you get out of jail, you can plant this great garden, in old shopping carts! ha @Sally McWilliam Hedin