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Rainfall also affects soil pH. Water passing through the soil leaches basic nutrients such as calcium and magnesium from the soil. They are replaced by acidic elements such as aluminum and iron. For this reason, soils formed under high rainfall conditions are more acidic than those formed under arid (dry) conditions.
Acid peat moss makes the soil a more acidic medium for your plants to live in. It can also hold onto nutrients if the soil is dry and prone to washing out when it rains. Acid peat moss is also a fully natural way to change your soil's acidity levels and does not come with the risks that chemical modifications might.