This concept consists of a mobile planter base made from a solid piece of cast concrete. The bottom of the base is inset to accommodate four 360 deg. The vertical wood structure forms a contemporary lattice to promote plant growth.
(I love this plant. Could grow it in OK, but not sure about Colorado?) This attractive form of horsetail (Equisetum) is an invasive spreader, but confined to a planter like this, it's well-behaved AND a cool architectural addition.