ON SMALL BALCONIES, MY FAVOURITE POTS FOR PLANTS ARE THE CHEAP PLASTIC CONTAINERS FOR PAINTING (WITH A ROLLER BRUSH). I TAKE OFF THEIR METALLIC HANDLE, PUT GRAVEL IN THE BOTTOM , AND THEN PLANTS AND SOIL. IT'S EASY TO REMOVE PLANTS WITH THIS SYSTEM (MORE DIFFICULT WITH A BIG SINGLE CONTAINER) AND THE SQUARE SHAPE SAVES SPACE!