Answer: The best way to know what to do is to retest the soil regularly and work from the results. Your county extension should be able to help you with the testing and interpreting the results and, since they are familiar with the composition of your local soils, can best recommend how to moderate and maintain the pH over time. You may actually find that using an acidic mulch such as pine needles is sufficient. Their phone number is (315) 963-0968. Enjoy your tree collection!
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