I felt that the plastic pots and clay pots were pretty sturdy once they were planted. However, depending on the type of pots you use and the area where the planter is set you may need extra support. One thing you can do is place a long dowel rod through the drainage holes. However, if you do this then your support pots will also need to have a hole in them so that the rod can go through all the clay pots, the support pots, and into the main planter.