The sidewalk is mostly concrete. The live oak's roots have made it uneven vertically, and cracks have allowed small plants to take root. From mid-spring to mid-fall, I occasionally edge the sidewalk and pull out grass and forbs along the edge. Over time, rain washes sediment from the main lawn onto the sidewalk, which accumulates along the edges.
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On May 1, 2017, I took pictures of German cockroach nymphs and other small insects crossing the sidewalk from the main lawn to the easement. In the process, I noticed what appeared to be small patches of lichen on the concrete.