Grayslake wakes with mist standing over the marsh grass at Rollins Savanna, and the old bur oaks hold onto it until the sun is well up. Agrilawn Environmental Services works those Lake County mornings, mowing, trimming, edging, and keeping a lawn even from the first cut of the year to the last. The ground here is glacial, kettle and moraine, wet in one corner and sandy in the next, so no two yards on a street behave quite alike. Reading that is half the craft; the other half is a clean line where turf meets walk. A finished Grayslake lawn under those oaks is worth the early start.