This planter is specially made for Manufactum from weather-proof hot-dip galvanised steel sheeting. Two long and two short planter boxes are part of the system and fit into a sturdy rectangular base plate. The base plate features slots in three rows, and you may choose the position of the planters (and change it later), making it easy to accommodate plants which grow at different rates. If necessary, you can remove a box or two completely. All planter boxes have drainage holes. We recommend, however, that you line the bottom of each planter box with a piece of wool fleece or other absorbent material. That way, excess water is stored, reducing the risk of dehydration in very warm weather in spring and summer.