On The Trail of Tongkat Ali From Forest To Finish Chris Kilham – The Medicine Hunter After a relatively brief hike into the forest, our Orang Asli friends located a good-sized Tongkat Ali tree. Tongkat Ali needs to be at least five years old before it is ready for harvesting, and this one was at least ten years old. It was a perfect specimen to harvest and would yield a root of around thirteen kilos in weight.