I am considering to get Garcia Machine Backpacker's Cache. According to MEC user reviews, this is the only cache approved in the Adirondack Mountains. Canadian parks, and other places as well, contain instructions of how to hang your food bear-proof in a tree. Those drawings are always related to bear bags rather than bear canisters.
If I am camping in an area with black bears and grizzly bears (but not polar bears!), do I still need to hang my cache in a tree, or is it sufficient to put it on the ground at a safe distance from my tent?