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Old 04-19-2011, 01:41 PM
caver77 caver77 is offline
 
Join Date: Jan 2011
Posts: 293
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Depends on what kind of soil, what the water table is like ,and what kind of water you have. I used to install miles of pt 4*6 timber as perimeter border between grass and rock gardens as a landscaper and where the water would sit they didn't last too long. I saw pt border very degraded in as little as two years when subjected to over irrigating, at drier location it could last 10-15 years. Depending on the soil, and water sometimes it's better to concrete them in, and sometimes I've seen screened rock work much better. I would tend to recommend using concrete rebar renforced piles formed up with sonotube and add a little fiber if you want (but is should be unnecessary). What do they generally use in the area?
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