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Copper rings around the base of plants, pressed into the earth so there are no gaps underneath, work brilliantly.
However if you're going to go to the effort of wrapping wire all around the circumference of a raised bed, why not add a 9v battery and go nuclear?
General_Strike-
lines starting with aHowever if you're going to go to the effort of wrapping wire all around >the circumference of a raised bed, why not add a 9v battery and go nuclear? 'greater than' >denote quoted text
Tried this last year - worked a treat for the first week or two, but corroded quickly and killed the battery. Perhaps a car battery would work better?
Screwball
People also say copper.
I'm not that convinced, but if you have enough spare copper wire you could try wrapping it around the raise bed.