The jar was gray and bare. (10)
Unlike the wilderness, the jar doesn't transform at all in this poem. It's gray, bare, and, we're betting, round, just like it was at the beginning of the poem.
It did not give of bird or bush (11)
Here is another line to show how static, or unchanging, the jar is. Unlike the wilderness, which—under the rule of the jar or not—can procreate and grow, the jar is stuck in its original boring shape.