What causes dark green spots in lawn?

Cause: Fairy rings are caused by fungi that live in the soil. As the fungi feed on organic matter, they release nitrogen, causing the grass to turn dark green. As the colony grows, it disturbs the flow of needed water to the turf roots, creating thin or dead spots.Click to see full answer. Likewise, people ask, why is my grass green on top but brown underneath?Your beautiful lawn is dying, and you’ve got brown patches on your grass. Grass turns brown when roots can no longer grab nutrients or water from soil, or when soil doesn’t contain enough food or water. Here are the typical culprits, and tips on how you can green up your grass again.Subsequently, question is, how do I make my lawn green and thick? Improve Your Soil. To get the most out of every step to a thicker lawn, take a tip from lawn pros and test your soil. Overseed. Overseeding is simply sowing grass seed into existing grass to make thin lawns thick—or keep them from getting thin. Fertilize. Boost Your Lawn. Irrigate. Mow Properly. Control Weeds. In respect to this, what is the light green grass in my yard? If you are seeing a strange light green grass in the lawn, you are probably seeing foxtail or crabgrass. These are considered grassy weeds (different than broadleaf weeds like clover and dandelions).What lawn grass is dark green? perennial ryegrass