If the soil is heavy clay, it will have to be amended with peat moss, or compost made from tree leaves, or something similar. Some people with heavy clay soil dig a hole, and fill the hole with pure peat moss, or a mix of peat moss and pine bark fines. Here in Madison, Wisconsin, I am growing blueberries successfully in a mix of native soil and compost, 50/50 by volume. There is some manual labor involved in getting the two components thoroughly mixed together. I am using agricultural sulfur to lower soil pH, and bromocresol green indicator solution to periodically take soil pH readings. Usually, I check pH in the spring, and sometimes, again in the fall. My experience has been that 6 ounces by volume of agricultural sulfur is about right to apply when planting a new shrub, here in Madison. It takes two years for the soil bacteria to metabolize all the sulfur, and turn it into acid. Any additional sulfur put down would be based on a soil pH test. Optimum pH is thought to be 4.5, for blueberry shrubs.
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