Dark green one foot wide streaks in my lawn
The dark streaks that you describe could be from a fungus called fairy ring. This soil-borne fungus causes the grass to grow rapidly (with a dark green color) near the edge of its advance in the soil. Sections of the turf then die back, but eventually recover. Unfortunately, there's no good chemical control for the fairy ring fungus. You can sometimes mask its effect by fertilizing and watering the lawn well.
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