Square Planter Stax Stacking unit Purchase our Planter Stax Base Unit, then add Stacking Units to grow your planter, not just your plants, to any height! Versatile stacking unit system. Base unit includes Geotextile liner to allow water to drain through but prevents growth of troublesome weeds. Tanalised treated Scandinavian Redwood for long life. Zinc plated fixings. Square planter base: 75cm x 75cm. Rectangular planter base: 50cm x 75cm. Other sizes can be made to your specifications. Also available with solid base and feet. Stacking Unit is two planks (20cm) high. Delivered fully assembled. No installation required.