The wood used for all planters is a local sourced New Redwood, planed and treated for outside use. You can paint them any colour for your garden if you wish. Planters are designed for tubs or to fill with soil. Just line with black plastic if you want to fill with soil and put a few holes for drainage in the bottom near a gap that is left for this purpose. Square planters have a loose fitting bottom so you can easily remove for tubs or put in for soil, again with a gap for drainage. Remember to put a few holes in any black plastic you use this helps with draining and stops water logging.
The wheel barrow planters are designed with a wonky wheel that revolves on a copper tube so you can move it around in the garden.
New ideas always welcome, just let me know.