We recently got a quote from a landscaper that says base concrete and mortar is pointless in Texas. It will crack/heave and not last. She wants to just go down a couple of inches and shape/cut the chop blocks so that fit nice together. One, I think the price is high for such an approach, but that aside, she said it with some diligence the Bermuda can be kept out with trimming and periodic spray. She said base concrete and mortar will also not keep out the grass.

I'm not convinced that a properly done base will not last without cracking and I believe will keep out the grass. Any thoughts on the best approach?

Thanks, Mike