This summer I discovered window screens are great for protecting my freshly potted seed pots against rain damage. Splashing from heavy rains this spring caused a number of my iris seeds to get tossed from their pots and onto the concrete. How annoying to not know which one goes back into which pot! The fact that the window screens also deter pesky birds & squirrels is just a bonus. It never crossed my mind they were deterring weeds too! Dennis in Cincinnati