Ten open shelves stack across five tiers in a 45-in square footprint just 11-in deep, so a growing plant collection lines up against a wall instead of spreading over the floor. Shelves alternate high and low, keeping back-row pots in the light rather than shaded by the ones in front. Each shelf is rated for 22 lbs, enough for a filled ceramic planter on any level. Pine boards are carbonized at high temperature and finished in varnish to slow rot and keep the surface smooth, and hollowed panels drain runoff and let air reach the roots.