Indigenous species would include both conifers and deciduous I believe. I consider the fall to be a poor time to collect deciduous species, and a second best time to collect conifers. The difference being the degree of root formation in the fat and the varied timing of dormancy between native deciduous and conifers. Briefly summed up conifers are a better bet and with care have a considerable success rate when collected in the fall. By this I mean just after the summer slow down of growth and before dormancy. It is best to time the collection after the dry summer period and the fall rains have started, that is when the tree puts on a spurt prior to dormancy. Shorter window, needs careful timing but is viable. Effective from my experience with Mountain Hemlock, Shore Pine, Sub alone Fir, Engleman Spruce. Thought it was worth mentioning for those who understand that fall collecting of conifers is effective if done right.