We do not recommend using weed-and-feed products. You will see far better results with separate applications of herbicides and fertilizers. If you decide to use weed-and-feed products anyway, you should apply them at the same times you would apply regular fertilizer in Kentucky, meaning: • For cool-season lawns: Early spring, late summer/early fall, and late fall  • For warm-season lawns: Early spring, early summer, and early fall