Anchor Planter Block TM Retaining Wall System From colorful plants to climbing vines, the planter block softens the look of a retaining wall system by adding natural elements and vegetation. Planter blocks feature a large recessed space that is perfect for soil and plants. To keep the plants looking beautiful, a built-in channel is included to hold irrigation lines. Incorporate these versatile planter blocks into Vertica®, Vertica Pro® and Diamond Pro® retaining wall systems, or use them alone as a wall system.