July afternoons in Hazel Crest come thick and humid, and the old oaks and elms over the streets throw enough shade to make a block bearable. Hernandez Lawn care LLC mows through that heat, taking the yards on a weekly turn so the grass never gets ahead of anyone. Trimming follows around fences, posts and tree rings, and the edges beside the walks come back to a straight cut. When autumn drops everything those big trees have been holding, the leaves are cleared off before the rain glues them to the lawn. A south-suburban block with every yard cut even is a fine sight from the corner.