On an August evening along Winnetka Road the air finally gives, and the hedges hold the day's heat like brick. LEVA Landscaping shapes them then — shears working the flat and the face until the line runs true from one end of a property to the other. Mowing and trimming keep the Northfield lawns underneath tidy through the hottest stretch, with edging that re-establishes every walk and bed line. Mulch goes down to hold moisture where the sun is hardest on a yard. When the sprinklers come on at dusk the whole place looks composed, which is the entire point.