Alternatives to Peat Moss for Blueberries

Determining Soil pH

• Before deciding on which soil amendments should be used to prepare a site for blueberries or to fertilize established plantings. A soil test should be conducted to determine existing soil pH, nutrient levels and the level of organic matter in the soil. This is an easily performed task that can either be accomplished with a do-it-yourself kit available at most garden stores, or by sending a sample to a professional or university laboratory. The fee for these tests is nominal and gives you a more complete picture of the soil profile.

Organic Acidifiers

• Several soil amendments can be used as alternatives for peat moss. Pine bark mulch is the most commonly used amendment in addition to peat moss for acidifying blueberries. Other acidic mulches can be used as well, but the use of hardwood mulches should be avoided. Animal manures can be used to acidify as well. These should be composted first though as the acid content of fresh manure is capable of lowering pH too much and can potentially burn roots.

Chemical Acidifiers

• Sulfur, in various forms, is the element most used to acidify soil to keep the pH within proper range for blueberry production. Aluminum sulfate should not be used as it can quickly build up to toxic levels in the soil. Elemental sulfur of ammonium sulfate should be used instead. For first year blueberries, 1 to 2 tablespoons of sulfur can be spread around the base of the plant in mid-spring and then again in early summer. In subsequent years, this amount should be increased to up 4 tablespoons.

Other Cultural Practices

• In addition to maintaining the proper soil acidity and organic matter required for rearing productive blueberries, observing some other proper cultural practices will help them to thrive. To ensure a viable crop of berries, ensure that the plants receive 1 to 2 inches of irrigation per week in the absence of rain. This is especially necessary between the months of June and August. Covering blueberry bushed with protective netting will help to reduce the amount of browsing by birds and other wildlife. Prune out dead and diseased branches and berries as they appear.