A garden can be as small as a tuft of moss on a rock. Moss are remarkable plants. They have no roots, but have a thin, root-like structure only one cell thick. This is how they stick to rocks and grow.
In the vegetable garden lies a zucchini from last summer. I let it lie to see what happens to it. At some point it should disintegrate and the seeds in it sprout, or so I am assuming that will happen. This is the wonder of having a garden. You can do all the scientific experiments you want.
In the woods lie many fallen trees and branches, knocked over by this winter’s storms. It’s amazing how much wood a small forest produces.