I have a small retaining wall at the end of my yard with a dangerous 8 foot drop on the other side of the wall. I want to prevent my kids from climbing on this wall. Catus is of course too sharp but I have seen some pointed agave looking plants that may keep the kids away from the end of the lot. I need to create a strong barrier that goes 50 feet across and not much more than 3 feet in depth.
All ideas welcome.
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