ACFT TURNING IN RUNUP AREA HITS TREES WITH WING TIP.

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I WAS TAXIING TO RUNUP AREA FOR RWY 36 AT GUENTHER ARPT LA GRANGE; TX. IT IS UNATTENDED. RWY IS 3230 FT LONG. THERE ARE A NUMBER OF SMALL CEDAR TREES/BUSHES AT THE END OF RWY 36 ON BOTH SIDES OF THE PAVED AREA. 90 PERCENT OR MORE OF THE TIME THE WIND IS FROM THE S SO RWY 18 IS USED FOR LNDG AND TKOF. I HAVE ONLY HAD RWY 36 ABOUT 3 OR 4 TIMES OUT OF SOME 40 OR 50 TRIPS TO LA GRANGE. AS I STARTED TO TURN THE ACFT AROUND IN THE RUNUP AREA; I WAS NOT WATCHING THE WING-TO-TREE DISTANCE AND THE L WINGTIP HIT A SMALL CEDAR TREE. IT SCRATCHED THE PAINT FOR ABOUT 12 INCHES AT THE END OF THE WINGTIP BUT DID NOT DAMAGE THE STROBE LIGHT OR NAV LIGHT. THERE DID NOT APPEAR TO BE ANY STRUCTURAL DAMAGE TO WING LEADING EDGE. I FLEW THE PLANE BACK TO THE ARPT I RENT FROM IN HOUSTON WHICH IS W HOUSTON ARPT. I ADVISED THE ARPT MGR OF THE INCIDENT. HE LOOKED AT THE PLANE AND AGREED THERE DID NOT APPEAR TO BE ANY DAMAGE. HOWEVER; HE IS GOING TO HAVE HIS MECH LOOK AT THE WINGTIP. HOW COULD THIS HAVE BEEN PREVENTED? BY MY BEING MUCH MORE CAREFUL IN TAXIING TO THE END OF A RWY THAT I DON'T USE OFTEN. REALLY BY BEING MORE CAREFUL AT ALL TIMES. HOWEVER; THIS IS THE ONLY ARPT I HAVE EVER FLOWN INTO WHERE THERE WERE TREES WITHIN THE WING SPAN IN THE RUNUP AREA OR ALONG THE SIDES OF THE RWY. I WILL BE MUCH MORE CAREFUL IN THE FUTURE. FORTUNATELY THIS INCIDENT DIDN'T RESULT IN DAMAGE TO ME OR THE PLANE. HAD THE TREES BEEN CUT DOWN WITHIN WING SPAN DISTANCE ON BOTH SIDES OF THE RWY; THE INCIDENT WOULD NOT HAVE HAPPENED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE SCRUB CEDAR TREES ARE ABOUT 12-14 FT HIGH. THEY ARE GROWING RIGHT UP TO THE EDGE OF THE RUNUP AREA. ARPT IS UNATTENDED BUT IS A MUNICIPAL ARPT AND SHOULD BE MAINTAINED BY CUTTING BACK THE TREES IN RUNUP AREA TO ALLOW TURNS WITHOUT WINGTIP CONTACT. THIS IS A VERY POPULAR ARPT AS THERE IS AN EXCELLENT RESTAURANT WITHIN WALKING DISTANCE. ALSO HAS LIGHTS SO IT GETS A LOT OF NIGHT TIME TFC. FEELS THIS IS A REALLY UNSAFE CONDITION. ONLY EXISTS AT ONE END OF RWY; RWY 36.