The answer to 'why is my paver thin grass' is that there are several common causes for thin or patchy grass between pavers. This can be due to poor soil preparation, insufficient sunlight, or improper watering and maintenance. The symptoms may include sparse, yellow, or stunted grass growth between the pavers.
To address this issue, you'll first want to check the soil conditions. The soil between the pavers may be too compacted, lack nutrients, or have poor drainage, all of which can inhibit grass growth. Aerating the soil and adding a top dressing of compost or topsoil can help improve the growing environment.