Plant pH Preferences

 

    Star-Tip 1013

Gardening Tips for successful and beautiful Landscapes and Gardens

 

Understanding the effects of soil pH on plants is an integral part of keeping them healthy. Alkalinity and pH go hand-in-hand and the soil and water in the desert southwest is very alkaline with a pH of between 8.0 and 8.5. As you look at what most of the plants listed in the reference prefer, you will see how it can be difficult to keep them healthy. At higher pH levels plants have difficulty taking up the nutrients that are in the soil. This high pH affects some more than others. Selecting plants that can tolerate higher levels of pH is one method, and doing things to maintain a lower pH level is another.

 

Check out Gardening Tip # 1016 Decreasing Soil Alkalinity and pH for ideas on keeping the pH of your soil at more tolerable levels.

 

Plant pH Preferences

 

pH 4.5 – 5.5

pH 5.5 - 6.0 (cont)

Azalea

Prayer plant (Maranta)

Camelia

Primrose (Primula)

Columnea

Rubber plant (Ficus)

Hydrangea (Blue)

Silk oak (Grevillia)

Lily of the Valley (Pieris)

Swiss cheese plant (Monsteria)

Liquidamber tree

Tradescantia

Orchid (most)

Urn plant (Aechemea)

Pachysandra terminalis

 

Parlour palm (Aspidistra)

 

Pin Oak Tree (Quercus palustris)

pH 5.5 – 6.5

Rhododendron

Alyssum

 

Coreopsis

pH 5.5 - 6.0

Dracaena

Amaryllis

Juniper (Juniperus)

Anthurium

Photinia

Bilbergia

Pine Tree (Pinus) most

Birch (Betula) – tree

 

Christmas cactus (Zygocactus)

pH 5.5 – 7.0

Cinquefoil (Potentilla)

Begonia

Conifer Trees (most)

Chrysanthemum

Crassula

Cineraria

Creeping fig (Ficus pumilla)

Coleus

Croton

Fuchsia

Dogwood (Cornus)

Lupin

Dumb cane (Diffenbachia)

Marigold (Tagetes)

Fir Tree (Abies)

Mother in law tongue (Sanseveria)

Gardenia

Pansy (Viola)

pH 5.5 - 6.0 (cont.)

pH 5.5 – 7.0 (cont.)

Hemlock Tree (Tsuga)

Poinsettia (Euphorbia)

Holly (Ilex) - tree

Sanseveria

Iris kaempferi

Violet (Viola)

Magnolia - tree

Yew (Podocarpus)

Norfolk Island pine (Auricaria)

 

Oak Ivy (Cissus)

pH 5.5 – 7.5

Philodendron

Canna

Phlox

Cosmos (Cosmea)

Pitcher plant (Nepenthes)

Rosemary (Rosmarinus)

Poor Mans Orchid (Schizanthus)

Crabapple Tree (Malus)

 

pH 6.0 - 6.5

pH 6.0 – 7.0 (cont.)

Crassula

Narcissus

Kaffir Lily (Clivia)

Passion flower (Passiflora)

Michelmas daisy (Aster)

Pear Tree (Pyrus)

Plumbago

Pincushon Flower (Scabiosa)

Poor man’s orchid (Schizanthus)

Plum Tree (Prunus)

Primula

Primrose (Primula)

Purslane (Portulaca)

Privet (Ligustrum)

Silk Oak (Grevillia)

Quince (Chaenomeles)

Wax Plant (Hoya)

Red hot poker (Kniphophia)

Waterlily (Nymphea)

Rose (Rosa)

 

Salvia

 

Snapdragon (Antirrhinum)

pH 6.0 – 7.0

Stock (Mathiola)

African Sumac tree (Rhus)

Strawberry tree (Arbutus)

African violet (St Paulia)

Sunflower (Helianthus)

Almond Tree (Prunus)

Tobacco (Nicotiana)

Apple Tree (Malus)

Tulip

Ash Tree (Fraxinus)

Viola

Baby’s breath (Gypsophia)

Wallflower (Erysimum)

Bird of paradise (Strelitzia)

Zinnia

Bougainvillea

 

Burning bush (Kochia)

 

Calendula

pH 6.0 – 7.5

Candytuft (Iberis)

Ageratum

Carnation (Dianthus)

Anemone

Coleus

Avens (Geum)

Columbine (Aquilegia)

Clematis

Coral bells (Heuchera)

Currant, flowering (Ribes)

Cyclamen

Eucalyptus - tree

Daffodil (Narcissus)

Forsythia

Dahlia

Grape vine (Vitis)

Delphinium

Grape Vine (Vitis)

Easter lily (Zantedeschia)

Impatiens

Fuchsia

Iris (Dietes)

pH 6.0 – 7.0 (cont.)

pH 6.0 – 7.5 (cont.)

Gladiolus

Jasmine (Jasminum)

Hollyhock (Althea)

Laurel (Prunus laurocerasus)

Hydrangea (Pink)

Lilac (Syringa)

Impatiens

Lillies (Lilium)

Lavender (Lavendula)

Lobelia

 

pH 6.0 – 7.5 (cont)

pH 6.5 - 7.5 (cont)

Mock orange (Pittosporum)

Forsythia

Mulberry Tree (Morus)

Foxglove (Digitalis)

Petunia

Freesia

Poplar Tree (poplus)

Geranium (Pelargonium)

Rock rose (Cistus)

Gerbra

Salvia (most)

Godetia

Verbena

Golden Rain Tree (Laburnum)

Willow Tree (Salix)

Gopher Plant (Euphorbia)

Witch hazel (Hamamelis mollis)

Heliotrope

 

Hibiscus

 

Honeysuckle (Lonicera)

pH 6.5 - 7.5

Hyacinth

Acacia - tree

Hydrangea (white)

Arbor vitae (Thuja)

Iceland poppy (Papaver)

Asparagus fern

Ivy (Hedera)

Aster

Lily (Lilium) most

Bachelor’s buttons (Ranunculus)

Maple Tree (Acer)

Barberry (Berberis)

Morning glory (Ipomea)

Bearded Iris

Myrtle (Myrtus)

Bird of Paradise (Caesalpina)

Oleander (Nerium)

Bleeding heart (Dicentra)

Orange (Citrus)

Boston Ivy (Parthenocissus)

Oxalis

Boxwood (Buxus)

Peach (Pumus persica)

Butterfly bush (Buddleia)

Peony

Cactus (Opuntia)

Pepper (Capsicum)

Cherry Tree (Prunus)

Phlox "annual"

Cockscombe (Celosia)

Pink (Dianthus)

Coconut palm (Cocos)

Rose of Sharon (Hibiscus)

Cotoneaster

Rose of Sharon (Hypericum)

Crocus

Snowdrop (Galanthus)

Daisy (Bellus)

Spirea

Day lily (Hemerocalis)

Sweet pea (Lathyrus)

Escallonia

Viburnum

Euonymus

White Poplar Tree (Poplus alba)

Euphorbia

Wisteria

Firethorn (Pyracantha)

Yucca (most)

Flax (Linum)

Foxglove (Digitalis)

Forget me not (Myosotis)

Freesia