Patchy grass is usually caused by soil that is lacking nutrients. This can be caused by certain trees, like Oaks that use a lot of nutrients. As a defense mechanism they make the soil around them acidic to keep other plants of trees from growing too close. Getting grass to grow can be a challenge. Start by trimming up any trees that are close to the ground and blocking sunlight from hitting the grass. Use a grass seed that is meant specifically for the area (sunny, dry, shady, etc.) Additionally, you can spread manure and or peat moss on top of it with some good topsoil over the area that needs to be planted. You’ll want to water it daily, of course. Once the new grass is ready to be mower for the first time you can spread a nitrogen based fertilizer over it and it should keep growing.
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