A year on the North Side runs about like this: April rain, a Welles Park green that fills in overnight, ninety humid days of growth, then October gold down Lincoln Avenue, then the first hard morning when everything is white to the curb. Landscaping Maintenance by Moritz Welt follows the whole circle — mowing, trimming and edging through the growing months, cleanups at both ends of them, and plowing, shoveling and salting once the temperature finally commits. Lincoln Square and Ravenswood blocks are dense with parkway trees, which means a great many leaves in one short stretch and a great deal of shade to mow around. Handling both trades means the same yard is looked after in August and in January. Few things say more about a house than a walk cleared to the concrete on a cold Tuesday.