How to Adjust Your Soil pH for Blueberry Plants
What is soil pH?
Blueberry plants thrive in acid soil that is in the 4.5 - 5.5 range on the pH scale. A soil with a pH lower than 7.0 is an acid soil and one with a pH higher than 7.0 is alkaline. Soil with a pH value of 7.0 is considered to be 'neutral'. Acidity is the measure of the concentration of hydrogen ions in the water, which is held between the soil particles. As hydrogen ions increase in density, the soil pH decreases.
The pH of the soil affects the overall conditions for plant and root growth. Certain nutrients such as zinc and iron are not utilized by the plant if the soil pH is above 7.5.
Soil Preparation for Planting Blueberry Plants
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Select a planting site that is in full sun and has good drainage.
- Blueberries require consistent irrigation to produce high yields of sweet blueberries, therefore select an area that is adjacent to an irrigation supply.
- Before you plant blueberries in a new area, it is important to determine
the pH of the soil. Most garden centers have home pH test kits
that you can
purchase to test your soil.
- If your soil tests at 6.0 or below, you will need to incorporate some soil acidifiers prior to planting. The most common are elemental sulfur, pine bark mulch, and peat moss. Incorporate peat moss into the planting hole at a rate of two parts soil to one part peat moss at the time of planting. If you are preparing a large area spread 4 - 6 inches of peat moss down first and then dig into the top 6 -8 inches of soil.
- If your soil is 6.0 or above, you may want to consider planting blueberry plants in a raised vegetable garden bed where you can import soil and soil conditions to achieve the desired pH.
- Mulch after planting; blueberries do best with a 2-4" mulch over the roots to conserve moisture, prevent weeds and add organic matter. Bark mulch, acid compost, sawdust, grass clippings, etc. all work well. Repeat every other year.