The Square Straight planter boxes are sleek and sturdy. These modern planter boxes would be perfect anywhere. Each size uses the same insert so you know you can mix and match while maintaining a consistent style. All of our Square Straight planters measure 15" across at the top and bottom. Select from 36" or 24" tall. The 36" planter comes with our patent pending shelf that nearly eliminates the chance of the planter box from blowing over.