The answer to 'hedge thin grass' is that thin or patchy grass under a hedge is a common problem caused by the hedge blocking sunlight and competing for water and nutrients. Symptoms include sparse, yellow, or stunted grass growth. To solve this, you can try trimming the hedge back to allow more sunlight, aerating the soil, and overseeding the area with a shade-tolerant grass variety. However, if the problem persists, it's best to consult a professional landscaper who can assess the specific conditions and recommend the best solution.
Hedges can create challenging growing conditions for grass, so it's important to manage them properly. A professional landscaper has the expertise to prune the hedge, improve the soil, and establish a healthy lawn under the hedge.