http://www.citygardening.net/pHflowers/
Thefollowing is a list of the range of pH's that different flowers will grow
best in:
African violets (Saintpaulia) 5.5-7.5
Ageratum, blue (Ageratum houstonianum) 6.0-7.5
Alyssum (Alyssum) 6.0-7.5
Amaryllis (Amaryllis) 5.5-6.5
Anthurium (Anthurium) 5.0-6.0
Arbor vitae (Thuja) 6.0-7.5
Arbutus, trailing (Epigaea repens) 4.0-5.0
Aster (Aster) 6.5-7.0
Azalea (Rhododendron) 4.5-6.0
Baby's breath (Gypsophila elegans) 6.0-7.5
Baby's tears (Soleirolia) 5.0-5.5
Bachelor's button Centaurea) 6.0-7.5
Barberry (Beberis) 6.0-7.5
Bayberry (Myrica pensylvanica) 5.0-6.0
Begonia (Begonia) 5.5-7.0
Bird of paradise (Strelitzia) 6.0-6.5
Bleeding Heart (Dicentra) 6.0-7.5
Bloodleaf (Iresine herbstii) 5.5-6.5
Bluebell (Mertensia virginica) 6.0-7.5
Boxwood (Boxus sempervirens) 6.0-7.5
Bridal wreath (Francia appendiculara) 6.0-8.0
Burning bush (Enonymous alatus) 6.0-7.5
Cacti (Cacti) 4.5-6.0
Cactus, christmas (Zygocecius truncelus) 5.0-6.5
Camellia (Camellia japonica) 4.5-5.5
Campanula (Campanula) 5.5-6.5
Candystuft (Iberia sempervirens) 5.5-7.0
Canna (Canna) 6.0-8.0
Carnations (Dianthus) 6.0-7.5
Chrysanthemum(Chrysanthemum) 6.0-7.5
Clematis(Clemantis) 5.5-7.0
Clivia(Clivia miniata) 5.5-6.5
Coleus(Coleus x Hybridus) 6.0-7.0
Columbine(Aquilegia x Hybrida) 5.5-7.0
Coralbells(Heuchera sanguinea) 6.0-7.0
Cosmos(Cosmos) 5.0-8.0
Coxcomb(Rhinanthus crista-galli) 6.0-7.5
Crabapple, flowering(Malus) 5.0-6.5
Crocus(Crocus) 6.0-8.0
Cyclamen(Cyclamen) 6.0-7.0
Daffodil(Narcissus) 6.0-6.5
Dahlia(Dahlia) 6.0-7.5
Daisy, shasta(Leucanthemum x Superbum) 5.0-6.0
Daphne(Daphne) 6.5-7.5
Delphinium(Delphinium) 6.0-7.5
Deutzia(Deutzia) 6.0-7.5
Dieffenbachia(Dieffenbachia) 5.0-6.0
Dogwood(Cornus) 5.0-6.0
Eucalyptus(Eucalyptus) 6.0-8.0
Fern, asparagus(Asparagus densiflorus) 6.0-8.0
Fern, bird's nest(Asplenium nidus) 5.0-5.5
Fern, Boston(Nephrolepis exaltata bostoniensis) 5.5-6.5
Fern, maidenhair(Adiantum pedatum) 6.0-8.0
Forget-me-not(Myosotis scorpioides) 6.0-8.0
Forsythia(Forsythia) 6.0-8.0
Freesia(Freesia x Hybrida) 6.0-7.5
Fuchsia(Fuchsia x Hybrida) 5.5-6.5
Gardenia(Gardenia Jasminoides) 5.0-6.0
Geranium(Pelargonium) 6.0-8.0
Gladiolus(Gladiolus) 6.0-7.0
Gloxima(Sinningia speciosa) 5.5-6.5
Heather(Calluna) 4.5-6.0
Hens and chicks(Asplenium bulbiferum) 6.0-8.0
Hibiscus, Chinese(Hibiscus rosa-chinensis) 6.0-8.0
Holly, English(Ilex aquifolium) 4.0-5.5
Holly, American(Ilex opaca) 5.0-6.0
Hollyhock(Alcea) 6.0-8.0
Honeysuckle bush(Lonicera) 6.5-8.0
Hoya(Hoya) 5.0-6.0
Hydrangea, blue(Hydrangea) 4.0-6.5
Hydrangea, pink(Hydrangea) 6.0-7.0
Hydrangea, white(Hydrangea) 6.0-8.0
Impatiens(Impatiens) 5.5-6.5
Iris(Iris) 5.5-7.5
Iris, Japanese(Iris ensata) 5.5-6.5
Ivy, Boston(Parthenocissus tricuspidata) 6.0-8.0
Ivy, English(Hedera helix) 6.0-8.0
Ivy, Grape(Cissus rhombifolia) 5.0-6.5
Jasmine(Jasminum) 5.5-7.0
Lady's slipper(Paphiopedilum) 5.0-6.0
Larkspur(Consolida) 6.0-7.5
Laurel(Laurelia) 4.5-6.0
Lilac(Syringa) 6.0-7.5
Lily, calla(Zantedeschia aethiopica) 6.0-7.0
Lily, day(Hemerocallis) 6.0-8.0
Lily, Easter(Lilium longiflorum) 6.0-7.0
Lily, madonna(Lilium candidum) 6.5-7.5
Lily, tiger(Lilium columbianum) 6.0-7.0
Lily of the valley(Convailaria) 4.5-6.0
Marigold(Calendula) 5.5-7.0
Mock orange(Philadelphus) 6.0-8.0
Morning glory(Ipomoea) 6.0-7.5
Narcissus(Narcissus) 6.0-7.0
Nasturium(Tropaeolum) 5.5-7.5
Pansy(Viola x wittrockiana) 5.5-6.5
Peony(Paeonia) 6.0-7.5
Petunia(Petunia) 6.0-7.5
Philodendron(Philodendron) 5.0-6.0
Phlox(Phlox) 5.0-6.0
Pink(Dianthus) 6.0-8.0
Poinsettia(Poinsettia pulcherrima) 6.0-7.5
Poppy(Papaver) 6.0-7.5
Portulaca(Portulaca) 5.5-7.5
Rhododendron(Rhododendron) 4.5-6.0
Rose(Rosa) 6.0-7.0
Rose of Sharon(Hibiscus syriacus) 6.0-7.5
Rubber plant(Ficus elastica) 5.0-6.0
Salvia(Salvia) 6.0-7.5
Scilla(Scilla) 6.0-8.0
Shrimp plant(Beloperone guitia) 5.5-6.5
Snapdragon(Antirrhinum majus) 6.0-7.5
Sweet pea(Lathyrus odoratus) 6.0-7.5
Verbena(Verbena) 6.0-8.0
Wisteria(Wisteria) 6.0-8.0
Yew, Japanese(Taxus cuspidata) 6.0-7.0
Yucca(Yucca) 6.0-8.0
Zinnia(Zinnia) 5.5-7.5
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