The pilot reported he was attempting to take off from a remote ridgeline with one hunting client aboard. He said the wind was gusting from the southeast at 5 to 20 knots. During the takeoff roll, the right wing struck Alder bushes, and the airplane was pulled to the right, collapsing the left main landing gear and damaging the left wing. The pilot wrote in his report that the accident could have been avoided by not attempting to take off from the ridge in gusty wind conditions.