In October the monarchs drift south over Dallas on their long way to Mexico, and on a still afternoon in Kiest Park you can watch them sail over the rolling woods, orange flakes against a pale blue sky. Below them the city is in its gentlest month: grass still green, nights finally cool, the light lower and kinder than it was all summer. SRH Landscapes LLC puts that good stretch to use in lawns and landscapes: a clean pass of the mower, a bed put in order, a yard readied for the mild months ahead. It is small, satisfying work, the kind that makes a passing butterfly look as if it chose exactly the right garden to cross. The oaks of Kiest will color soon enough, and a tidy lawn makes a fine front row.