Thank you for that explanation. I always wondered. I guess I'm a lazy gardner, tooOh yes I am. The lazy refers to my system of gardening: heavy mulch, (cuts way down on the weeds, and any weeds that grow are either turned into liquid fertilizer, left to do their thing, or become chicken fodder) letting plants self sow, trellising where I can so I don't have to bend over, And, I LOVE my cattle panels!