As we grow older, the inevitability of age catches up with us, and our bodies simply can’t do what they once did. Forget about running a marathon—though some beat the odds and do it—and forget about bench pressing 300 pounds. At some point, it becomes notably challenging to bend over and stand back up, let alone lift a 25-pound item from the ground. Growing a garden, for example, just isn’t as relaxing as it used to be. When things get to this point, we have to start thinking smarter instead of working harder, and there are lots of ways we can make gardening easier physically if we just plant sensibly.…