Vertical Gardening with Wooden Pallets

I gotta try this. Gardening in small spaces is always a challenge. In my case, if I can't grow it in a hanging basket or in a greenhouse, it probably won't grow unless no critter on earth wants to eat it. Even if nothing eats it, it has to tolerate hot days and cool nights. I think I would try laying it down flat to plant, at least for a row or two before adding soil one handful at a time. I could also see trying it in the greenhouse as a vertical garden for lettuce or herbs that don't grow terribly tall.