We are growing blueberries. We planted them about 25 years ago - about 15 years before we learned that blueberries won't grow here in Rock County. While this year we have very few due to last year's drought, we usually pick 3 gallons for the freezer in addition to what is eaten by the grands and used during the harvesting season.
Before planting, we dug out all the soil in our turn-around and amended it with pine needles, coffee grounds, ground oak leaves, peat, anything we could find that would add acid to the soil before we planted the blueberries. For many years we also added aluminum sulfate or garden sulfur.
After all these years we get about a gallon per plant after the eating out of hand is discounted.
I once read that experiments have shown that acid loving plants that are properly given what they need when planted in alkaline soil will, over time, change the soil around them causing it to become more acidic. The same results for alkaline loving plants put in acidic soil and treated to raise the acidity. In time the plant 'makes' the surrounding soil more alkaline.