How to Grow Blueberries in the Ground

The acidification program, in order

Year before planting: soil-test the exact bed (kits and lab tests are available through county Extension offices). The test tells you current pH and how far you have to move it — never guess sulfur amounts, because the required rate depends on your starting pH and soil type, and your soil-test report or Extension office will give the rate for your soil.

Fall before spring planting: broadcast the recommended amount of elemental sulfur and till it in. Both Penn State and Iowa State stress the timing — sulfur is converted by soil bacteria and reacts slowly, so it needs months to work, which is why it goes on the fall (or a full year) before planting, incorporated into the root zone.

Just before planting: re-test. If the pH hasn't reached the target range yet, postpone planting and amend again — planting into soil that is still too alkaline gives you chlorotic, stalled bushes that rarely recover. Penn State also notes the flip side: pH below the range risks manganese or aluminum toxicity, so more sulfur is not better.

Planting and early care

Choose a full-sun, well-drained site and mix plenty of moist peat moss into the planting hole — sphagnum peat both acidifies slightly and supplies the organic, moisture-holding root environment blueberries evolved in. Set plants at nursery depth and water in well.

Mulch generously (pine needles, bark, or wood chips), keep the shallow, fibrous root system consistently moist through the first seasons, and remove blossoms the first year so energy goes into establishment.

Plant at least two different compatible varieties for cross-pollination and bigger crops, spaced per our blueberry spacing guide.

Keeping it acidic (and knowing when to quit)

Soil pH drifts back up over time, especially where irrigation water is alkaline, so re-test the bed every couple of years and follow your test report's maintenance recommendations. Fertilize with acid-forming fertilizers sold for azaleas/blueberries rather than ordinary garden formulas.

Remember the constraint Penn State flags: because sulfur doesn't move readily down through soil, surface applications around established bushes do little — which is exactly why the pre-plant incorporation matters so much.

If you're gardening on strongly alkaline or limestone soil, holding a bed at pH 4.5–5.0 indefinitely is a losing fight. Containers with an acidic mix sidestep the problem entirely — see our growing-blueberries-in-pots guide.

Sources

Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.

• Penn State Extension — Site Selection and Preparation for Home Blueberry Plantings — Soil pH should be between 4.5 and 5.0 (lower risks manganese/aluminum toxicity, higher causes nutrient unavailability, notably iron); in the year before planting eliminate weeds, build organic matter, and test the soil; sulfur's effects require time so add it in the fall before planting; surface sulfur applications after plants are in place are ineffective because sulfur does not move readily through soil; mix plenty of moist peat moss into the planting hole.
• Iowa State University Extension — How do I lower the soil pH for blueberries? — Lower pH with sphagnum peat moss or sulfur; sulfur should be incorporated into the soil a year before planting as it reacts slowly; aluminum sulfate should not be used because large amounts can be toxic to blueberry plants.

Keep going