<human>:  How do I adjust the pH levels in my garden’s soil to ensure optimal growth conditions?
<bot>: To adjust the pH levels in your garden’s soil, you can add lime or sulfur to decrease or increase the pH level as needed. Doing a soil test can help you determine which type of amendment to use, and how much. You can also use soil additives such as compost or manure, which will help you maintain the levels in your garden's soil, allowing optimal growth conditions.