Answer: Most plants grow well with a soil pH of 6.0 to 7.5. If the pH is much higher (alkaline) or lower (acidic), certain minerals are tied up in the soil and unavailable to plants. This nutrient imbalance may cause plants to grow slowly or leaves to take on a yellowish appearance. There are exceptions: azaleas and blueberries like a very acidic soil, lilacs prefer an alkaline soil. If you're growing flowers rather than vegetable crops, your soil is probably adequate. If you want bigger plants and better harvests, then have your soil pH tested and then amend it so it falls within the 6.0 to 7.5 range.
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