The pilot had not flown for three months and was keen to take advantage of good weather. He attempted to take off from his private, 310 m long, grass strip, with no wind indicated on the windsock. He continued past a visual marker which he used to check his rotation point because the aircraft had almost reached its takeoff speed. It became airborne but clipped a hedge on the western boundary of the strip and overturned in an adjacent tall crop. The pilot was able to escape unassisted but banged his head slightly as he vacated. He noted that he had recently lost weight and was glad that he had tightened his harness before flight.