Originally Posted by alldayrj
Why do you have to trench through the rock, do the tree roots make it down there? Or are you installing a plastic barrier like for bamboo
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The soil horizons in the hill country of texas can vary. Sometimes you will have rock down to 2 ft then clay or caliche. Roots don't like caliche but they can go through that horizon on their way to someplace else. there generally are not roots in solid rock BUT it's tough to know how deep the rock (or shallow) it is and if it's just a flat table like piece of limestone, there could be roots before or after it. Best to do a continuous trench and check for roots at your deepest points. It's a PITA but I had to try.