Soil for plants that need a lower PH, for example: blueberry bushes, and hydrangeas.
Plants that prefer a very acidic soil (pH 4.0 – 5.4) :
Bog Rosemary, Azalea, Blueberry, Heather, Sweet pepperbrush, Hydrangea, Laurel, Rhododendron, Bearberry, Wintergreen
Plants that prefer a slightly acidic soil (pH 5.5-6.0) :
Serviceberry, Chokeberry, Blue Beech, white and red oak, Sweetfern, alternate-leaved dogwood, false cypress, spruce, fern, strawberry, raspberry, Witch-Hazel, Holly, Yew, Magnolia, larch, hemlock, fir – See more at: http://www.fafard.ca/en/produit/acid_loving_plants_and_berries_soil_mix/#sthash.AEgise4d.dpuf