I hope this hasn't been posted before..........I found a soluntion to pots being toppled by the wind or vibrations.

{{gwi:170}}

"On The Edge Pots

Michael Hilgers offers a modern take on the traditional window flower box with his On The Edge Pots (2006). Designed to straddle the railing of a balcony, the pots are made from water-resistant polyethylene and can rest on any railing with a maximum thickness of 60mm. Two separate compartments offer multiple planting options. The On The Edge Pot is ideally suited for urban dwellers with limited outdoor space, but can easily be used in the workspace or restaurants to liven up a patio. Available in orange, white, green, black and white. Design Within Reach."