When should I add soil acidifier and fertilizer to blueberries

Asked January 15, 2020, 11:28 AM EST

I have Espoma Soil Acidifier (elemental Sulfur and Gypsum) and Hollytone (4-3-4). When should I add these to my blueberries? Do I add the soil acidifer first and then wait a couple weeks and then add the fertilizer? Also, does the acid go away or do I need to do this every year?

Howard County Maryland

1 Response

Blueberries prefer a soil pH of 4.3-5.3 high in organic matter. You did not mention if you tested the soil before you planted the blueberries. Soil test results give pH, nutrient deficiencies, and recommendations for lowering the pH if needed. This is usually done the year before planting. It is difficult to lower pH after the fruits are planted. If you have not done so, test the soil and follow recommendations (if necessary).
https://extension.umd.edu/hgic/topics/soil-testing
See our page on soil preparation https://extension.umd.edu/hgic/topics/blueberries-selection-soil-preparation-planting

We recommend fertilizing with ammonium sulfate (21-0-0) in spring. See our fertilizer recommendations
https://extension.umd.edu/hgic/topics/blueberry-care

Marian