The vast majority of plants grown in the landscape prefer a slightly acid soil in the pH range of 6.0 to 7.0. However, there are a number of species that require a more acid soil in order to thrive and do their best. Listed below are several such species which prefer a pH in the range of 4.0 to 5.5.

Arctostapitylos uva-unsi - Kinnikinnick
Calluna vulgaris - Scotch Heather
Camellia species - Camellia
Choisya ternata - Mexican Orange
Clethra alnifolia - Summersweet
Enkianthus campanulatus - Redvein Enkianthus
Erica species - Heath
Exochorda species - Pearlbush
Fothergilla species - Fothergilla
Gardenia jasminoides - Gardenia
Hydrangea quercifolia - Oakleaf Hydrangea
Ilex species - Holly
Juniperus communis - Common Juniper
Kalmia latifolia - Mountain Laurel
Leucothoe fontanesina - Drooping Leucothoe
Magnolia species - Magnolia
Mahonia species - Oregon Grape Holly
Rhododendron species - Rhododendron and Azalea
Tsuga canadensis - Hemlock
Vaccinum corymbosum - Highbush Blueberry