I edge with a shovel and I only have to do it about twice a year. Something my pops taught me and I will never go about it any other way. I don't even own a weed whacker or edger. It takes a lot more time when you actually have to do it but well worth the time IMO.
I agree, I edge my mulch beds with a shovel. Use my weed whacker for the grass along the fence and the edging head attachment on the sidewalk
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