My garden is edged in stones, but not all of them are real. After dropping a few bucks on real rocks and scrounging reject rocks from friends, I still didn't have enough edging stones to ring my expanding gardens.
Last year I found an idea on the Garden Web forums where user wendy2shoes plopped wet hypertufa concrete mix into a plastic bag to make "rock" edging. I didn't have a bag of concrete at the time, but I did have grout left over from a bathroom tile project. And look, grout works too!
The process is easy. I like to mix 4 parts grout to 1 part water. Sometimes I add kitty litter or craft sand into the mix.
I set the bag either twist side up or down depending on whether I want to add extra texture to the stone. I then let the "rock" set up a day or two before I unwrap it and place it in the garden bed.
I still have to make about ten more rocks, but the mixing literally takes 5 minutes. I knew those 5 bazillion grocery bags I had saved would come in handy.
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