Cat + Fly + Screen
Originally uploaded by zebble
Warning to cats: don't try this at home!
In case your cats rip a window screen, or the screen ages to the point where you must replace it, consider cutting the screen to sizes to fit in the bottom of your garden pots.
Set in the piece of screen before filling with potting soil.
This is an ideal way to let water drain out while preventing soil from falling out the bottom of the pots.
This tip is very green since it prevents torn screens from ending up at the city or county landfill, and costs us cheapskate gardeners zero zip nada.