If your lawn struggled through summer heat, your first instinct may be to grab a bag of fertilizer as soon as the weather cools down. That’s not necessarily wrong, but cool-season lawn fertilizer timing matters almost as much as what’s inside the bag. Grasses such as tall fescue, Kentucky bluegrass, perennial ryegrass, and fine fescue do much of their strongest growing when temperatures moderate, making fall an especially valuable feeding window. The University of Missouri recommends concentrating much of cool-season turf’s fertilization in fall rather than relying heavily on spring feeding. Understanding when the grass can actually use those nutrients can save money, encourage stronger roots, and reduce the temptation to fertilize simply because the garden center has stacked bags by the entrance.
