Ergo "Quadro" Stackable Raised Bed Planters by Graf (3 Sizes) Made in GermanyFREE SHIPPING! EASY TO ASSEMBLE The Ergo "Quadro" series is a four sided square rectangle version of the popular hexagon shaped modular planter system. Ergo is available in three sizes: Ergo Quadro S (60 x 60 cm), Ergo Quadro M (60 x 80 cm) and Ergo Quadro L (80 x 80 cm). Ergo is a modular raised bed planter system can be stacked as high as needed for your application. Each basic set contains 4 panels which are 10 inches high and can clip together