Scientists call it trifoliate orange. Barrier Concepts Inc. uses the brand name Living Fence. Most appropriate, perhaps, is its more common nickname "P.T.," which stands for "pain and terror."
That is what intruders experience if they try to penetrate one of the newest and most unusual security devices on the market: rows of P.T. bushes used as fences. Amid the innocuous-looking white flowers and glossy green leaves are 4-in. razor-sharp thorns that make the bushes nearly impossible to climb over and are strong enough to stop a speeding jeep. P.T. plants grow naturally in the hills of East Tennessee, sometimes reaching...
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