It is common knowledge that blueberries require acidic (low pH) soil. In many areas of Canada the soil is naturally not acidic enough (pH too high). Here we recommend our popular Blueberry Booster (see page 59). A number of other trees also prefer more acidic soil and will benefit from annual applications of Blueberry Booster. These include Chestnuts, Pawpaws and Persimmons.
Suggested Rate:

• When planting trees – 250g (1 cup) top dressed and lightly
  raked in before soaking with water.
• For established trees – 500g (2 cups) per 25mm (1") of tree
  trunk diameter broadcast under tree in early spring.
  In addition, another way to accommodate these 'special needs'
  plants is to add vinegar or citric acid to their irrigation water.
  (2.5 litres common white vinegar to a 20 litre bucket of water).