Once your lawn is actively growing, it is best practice to fertilize lightly in the springtime. During the fall months, we recommend applying a bit more fertilizer. During the growing season, every 6 to 8 weeks is a good time frame to aim for when fertilizing the bluegrass. If you notice your Kentucky Bluegrass is growing slower, looking more yellow than normal, or is starting to grow weeds, don’t be afraid to lay the fertilizer a little thicker next time. It’s important to keep in mind that adding too much fertilizer can harm your lawn.