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Soil pH Guide

This Soil pH Guide gives a range of soil pH values recommended for many plant varieties.  Soil pH is a measure of the relative acidity or alkalinity of the soil and is based on a scale with 7.0 representing neutral soil i.e. neither acidic nor alkaline. Although the theoretical range of pH is much wider, for gardening purposes the range considered is typically between 4.0 (very acidic) and 10.0 (very alkaline).

Soil pH Guide

Most garden plants prefer neutral to slightly acidic soil (pH 6.5) and tolerate a variance of at least 1.0 pH point though some plants have more specific requirements as can be seen in the table below. Soil pH can vary across a site and is influenced by such factors as rainfall, existing mineral deposits and of course the addition of soil conditioners. Soil pH also affects the ability of plants to absorb fertilisers and other soil trace elements as well as affecting the level of soil bacteria, the presence of which is essential for healthy soil.

The pH of garden soil can be tested using a simple test kit such as the Manutec Soil pH Test kit, an Australian made kit based on CSIRO research. When using a test kit follow the instructions with regard to both number of samples and test procedure. Soil pH can be adjusted if necessary by adding the relevant soil conditioners (typically agricultural lime, dolomite lime or a combination of the two to raise pH or agricultural sulphur to lower pH). Different soil types require different quantities of soil conditioners for the same effect and extreme pH values may be impossible to correct due to soil chemistry. Be patient and avoid quick fixes to pH that may have detrimental results and check resulting pH periodically to maintain the desired level. It may be necessary to condition different parts of the garden in different ways depending on both variations in pH across a garden and the requirements of the plants growing in different parts of the garden.

Plant Name Preferred pH Range*
Abelia 6.0-8.0
Abutilon 5.5-6.5
Acacia 6.0-8.0
Acanthus 6.0-7.0
Aconitum 5.0-6.0
Acorus 5.0-6.5
Adonis 6.0-8.0
Aechmea 5.0-5.5
African Violet 6.0-7.0
Ageratum 6.0-7.5
Ailanthus 6.0-7.5
Ajuga 4.0-6.0
Althea 6.0-7.5
Alyssum 6.0-7.5
Amaranthus 6.0-6.5
Amaryllis 5.5-6.5
Anchusa 6.0-7.5
Androsace 5.0-6.0
Anemone 6.0-7.5
Anthurium 5.0-6.0
Anthyllis 5.0-6.0
Apostle Plant 5.5-6.5
Apple 5.0-6.5
Apricot 6.0-7.0
Aralia 6.0-7.5
Arbutus 4.0-6.0
Ardisia 6.0-8.0
Arenaria 6.0-8.0
Aristia 6.0-7.5
Armeris 6.0-7.5
Arnice 5.0-6.5
Arrowhead 5.0-6.0
Artichoke 6.5-7.5
Asparagus 6.0-8.0
Asparagus Fern 6.0-8.0
Asperula 6.0-8.0
Asphodoline 6.0-8.0
Aster 5.5-7.5
Astilbe 6.0-8.0
Aubretia 6.0-7.5
Avens 6.0-7.5
Avocado 6.0-7.5
Azalea 4.5-6.0
Azalea 4.5-6.0
Baby’s Breath 6.0-7.5
Baby’s Tears 5.0-6.0
Banana 5.0-7.0
Basil 5.5-6.5
Bean (Runner, Broad, French) 6.0-7.5
Beauty Bush 6.0-7.5
Beetroot 6.0-7.5
Begonia 5.5-7.0
Bergenia 6.0-7.5
Bird of Paradise 6.0-6.5
Bishop’s Cap 5.0-6.0
Blackberry 5.0-6.0
Black-eyed Susan 5.5-7.5
Bleeding Heart 6.0-7.5
Blood Leaf 5.5-6.5
Bluebell 6.0-7.5
Bottle Brush 6.0-7.5
Bougainvillea 5.5-7.5
Boxwood 6.0-7.5
Broccoli 6.0-7.0
Bromeliads 5.0-6.0
Broom 5.0-6.0
Brussels Sprouts 6.0-7.5
Buddleia 6.0-7.0
Buphthaium 6.0-8.0
Butterfly Flower 6.0-7.5
Cabbage 6.0-7.5
Cactus 4.5-6.0
Calabrese 6.5-7.5
Caladium 6.0-7.5
Calceolaria 6.0-7.0
Calendula 5.5-7.0
Calla lily 6.0-7.0
Camassia 6.0-8.0
Camellia 4.5-5.5
Candytuft 6.0-7.5
Canna 6.0-8.0
Canterbury Bells 6.0-7.5
Capsicum Pepper 5.0-6.5
Cardinal Flower 5.0-6.0
Carnation 6.0-7.5
Carrot 5.5-7.0
Cast Iron Plant 4.0-5.5
Castor Oil Plant 5.5-6.5
Catalpa 6.0-8.0
Cauliflower 5.5-7.5
Celery 6.0-7.0
Celosia 6.0-7.0
Centaurea 5.0-6.5
Century Plant 5.0-6.5
Cerastium 6.0-7.0
Cherry 6.0-7.5
Chicory 5.0-6.5
Chinese Cabbage 6.0-7.5
Chinese Evergreen 5.0-6.0
Chinese Lantern 6.0-7.5
Chinese Primrose 6.0-7.5
Chives 6.0-7.0
Christmas Cactus 5.0-6.5
Chrysanthemum 6.0-7.0
Cineraria 5.5-7.0
Cissus 6.0-7.5
Cistus 6.0-7.5
Clarkia 6.0-6.5
Cleanthus 6.0-7.5
Clematis 5.5-7.0
Clerodendrum 5.0-6.0
Clivia 5.5-6.5
Cockscomb 6.0-7.5
Coffee Plant 5.0-6.0
Colchicum 5.5-6.5
Coleus 6.0-7.0
Columbine 6.0-7.0
Columnea 4.5-5.5
Convolvulus 6.0-8.0
Coral Berry 5.5-7.5
Coreopsis 5.0-6.0
Corn – Sweet 5.5-7.5
Coronilla 6.5-7.5
Corydalis 6.0-8.0
Cosmos 5.0-8.0
Cotoneaster 6.0-8.0
Courgettes 5.5-7.0
Crab Apple 6.0-7.5
Cranberry 5.5-6.5
Crassula 5.0-6.0
Creeping Fig 5.0-6.0
Cress 6.0-7.0
Crocus 6.0-8.0
Croton 5.0-6.0
Crown of Thorns 6.0-7.5
Cucumber 5.5-7.0
Cuphea 6.0-7.5
Currant – Black 6.0-8.0
Currant – Red 5.5-7.0
Currant – White 6.0-8.0
Cyclamen. 6.0-7.0
Cynoglossum 6.0-7.5
Cyperus 5.0-7.5
Daffodii 6.0-6.5
Dahlia 6.0-7.5
Damson 6.0-7.5
Daphne 6.5-7.5
Day Lily 6.0-8.0
Delphinium 6.0-7.5
Deutzia 6.0-7.5
Devil’s Ivy 5.0-6.0
Dianthus 6.0-7.5
Dielfenbachia 5.0-6.0
Dipladenla 6.0-7.5
Dizygotheca 6.0-7.5
Dogwood 5.0-7.0
Dracaena 5.0-6.0
Dragon Tree 5.0-7.5
Dutchman’s Pipe 6.0-8.0
Easter lily 6.0-7.0
Edelweiss 6.5-7.5
Elaeagnus 5.0-7.5
Elephant’s Ear 6.0-7.5
English Ivy 6.0-7.5
Enkianthus 5.0-6.0
Episcia 6.0-7.0
Erica 4.5-6.0
Eucalyptus 6.0-8.0
Euphorbia 6.0-7.0
Everlasting 5.0-6.0
Fan Iris 6.0-8.0
Feijoa 5.0-7.5
Fennel 5.0-6.0
Fern – Bird’s Nest 5.0-5.5
Fern – Boston 5.5-6.5
Fern – Button 6.0-8.0
Fern – Christmas 6.0-7.5
Fern – Cloak 6.0-7.5
Fern – Feather 5.5-7.5
Fern – Hart’s Tonge 7.0-8.0
Fern – Holly 4.5-6.0
Fern – Maidenhair 6.0-8.0
Fern – Rabbits Foot 6.0-7.5
Fern – Spleenwort 6.0-7.5
Fig (Ficus) 5.0-6.0
Firethorn 6.0-8.0
Fittonia 5.5-6.5
Forget-me-not 6.0-8.0
Forsythia 6.0-8.0
Foxglove 6.0-7.5
Freesia 6.0-7.5
French Marigold 5.0-7.5
Fritillaria 6.0-7.5
Fuchsia 5.5-6.5
Gaillardia 6.0-7.5
Gardenia 5.0-6.0
Garlic 5.5-7.5
Gazania 5.5-7.0
Genista 6.5-7.5
Gentiana 5.0-7.5
Geranium 6.0-8.0
Geum 6.0-7.5
Ginger 6.0-8.0
Gladioli 6.0-7.0
Globularia 5.5-7.0
Gloxinia 5.5-6.5
Godetia 6.0-7.5
Goldenrod 5.0-7.0
Gooseberry 5.0-6.5
Gourd 6.0-7.0
Grape Hyacinth 6.0-7.5
Grape Ivy 5.0-6.5
Grapefruit 6.0-7.5
Grapevine 6.0-7.0
Grass – Bent 5.5-6.5
Grass – Clover 6.0-7.0
Grass – Fesau 6.0-7.5
Grass – Meadow 6.0-7.5
Grass – Pampas 6.0-8.0
Grass – Rye 6.0-7.0
Grevillea 5.5-6.5
Gypsophllla 6.0-7.5
Hawthorn 6.0-7.0
Hazelnut 6.0-7.0
Hedera (Ivy) 6.0-7.5
Heliotropium 6.0-8.0
Hellanthus 5.0-7.0
Helleborus 6.0-7.5
Hens & Chickens 6.0-7.0
Herringbone Plant 5.0-6.0
Hibiscus 6.0-8.0
Holly 5.0-6.5
Hollyhock 6.0-8.0
Honeysuckle 6.0-7.5
Hop 6.0-7.5
Horseradish 6.0-7.0
Hoya 5.0-6.5
Hyacinth 6.5-7.5
Hydrangea (Blue) 4.0-5.0
Hydrangea (Pink) 6.0-7.0
Hydrangea (White) 6.5-8.0
Hyperitum 5.5-7.0
Ice Plant 6.0-8.0
Ii Never Never Plant 5.0-6.0
Impatiens (Busy Lillie) 5.5-6.5
Inch Plant 5.0-6.0
Indigofera 6.0-7.5
Iresine 5.0-6.5
Iris 5.0-6.5
Ivy 6.0-8.0
Ivy Tree 6.0-7.0
Jacaranda 6.0-7.5
Japanese Sedge 6.0-8.0
Jasminum 5.5-7.0
Jerusalem Cherry 5.5-6.5
Jessamine 5.0-6.0
Juniper 5.0-6.5
Kaffir 6.0-7.5
Kalanchoe 6.0-7.5
Kale 6.0-7.5
Kalmia 4.5-5.0
Kangaroo Thorn 6.0-8.0
Kangaroo Vine 5.0-6.5
Kerria 6.0-7.0
Kohlrabi 6.0-7.5
Laburnum 6.0-7.0
Lace Flower 6.0-7.5
Lantana 5.5-7.0
Laurel 4.5-6.0
Laurus (Bay Tree) 5.0-6.0
Lavender 6.5-7.5
Leek 6.0-8.0
Lemon 6.0-7.0
Lemon Plant 6.0-7.5
Lentil 5.5-7.0
Lettuce 6.0-7.0
Liatris 5.5-7.5
Ligustrum 5.0-7.5
Lilac 6.0-7.5
Lily of the Valley 4.5-6.0
Lithospermum 5.0-6.5
Lobelia 6.0-7.5
Lupinus 5.5-7.0
Lychee 6.0-7.0
Magnolia 5.0-6.0
Mahonia 6.0-7.0
Mango 5.0-6.0
Marguerite 6.0-7.5
Marigold 5.5-7.0
Marjoram 6.0-8.0
Marrow 6.0-7.5
Melon 5.5-6.5
Millet 6.0-6.5
Mimosa 5.0-7.0
Mind Your Own Business 5.0-5.5
Mint 7.0-8.0
Mollnia 4.0-5.0
Monstera (Swiss Cheese Plant) 5.0-6.0
Moraea 5.5-6.5
Morning Glory 6.0-7.5
Moss 6.0-8.0
Moss, sphagnum 3.5-5.0
Mother-of-Thousands 5.0-6.0
Mulberry 6.0-7.5
Mushroom 6.5-7.5
Mustard 6.0-7.5
Myosotis 6.0-7.0
Myrtle 6.0-8.0
Narcissus 6.0-7.5
Nasturtium 5.5-7.5
Nectarine 6.0-7.5
Nephthytis 4.5-5.5
Nicodernia (Indoor Oak) 6.0-8.0
Nicotiana 5.5-6.5
Nicotlana 5.5-6.5
Norfolk Island Pine 5.0-6.0
Oleander 6.0-7.5
Olive 5.5-6.5
Onion 6.0-7.0
OpIisemenus 5.0-6.0
Orange Plant 6.0-7.5
Orchid 4.5-5.5
Oxalis 6.0-8.0
Pachysandra 5.0-8.0
Paeonia 6.0-7.5
Painted Lady 6.0-7.5
Palms 6.0-7.5
Pandanus 5.0-6.0
Pansy 5.5-7.0
Papaw 6.0-7.5
Paprika 7.0-8.5
Parsley 5.0-7.0
Pasque Flower 5.0-6.0
Passion Flower 6.0-8.0
Patient Lucy 5.5-6.5
Paulownia 6.0-8.0
Pea 6.0-7.5
Peach 6.0-7.5
Peacock Plant 5.0-6.0
Peanut 5.0-6.5
Pear 6.0-7.5
Pea-Sweet 6.0-7.5
Pelagoniums 6.0-7.5
Pellionia 5.0-6.0
Penstemon 5.5-7.0
Peony 6.0-7.5
Peperomia 5.0-6.0
Pepper 5.5-7.0
Peppermint 6.0-7.5
Periwinkle 6.0-7.5
Petunia 6.0-7.5
Philodendron 5.0-6.0
Phlox 5.0-6.5
Pilea 6.0-8.0
Pineapple 5.0-6.0
Pinks 6.0-7.5
Pistacio 5.0-6.0
Pitcherplant 4.0-5.5
Pittosporum 5.5-6.5
Plantain 6.0-7.5
Plum 6.0-7.5
Plumbago 5.5-6.5
Podocarpus 5.0-6.5
Poinsettia 6.0-7.5
Poligonum 6.0-7.5
Polyanthus 6.0-7.5
Polyscias 6.0-7.5
Pomegranate 5.5-6.5
Poppy 6.0-7.5
Portulaca 5.5-7.5
Potato 4.5-6.0
Potato-Sweet 5.5-6.0
Pothos 5.0-6.0
Prayer Plant 5.0-6.0
Primrose 5.5-6.5
Primula 6.0-7.5
Privet 6.0-7.0
Prunella 6.0-7.5
Prunus 6.5-7.5
Pumpkin 5.5-7.5
Puncia 5.5-6.5
Pyracantha 5.0-6.0
Pyrethrum 6.0-7.5
Quince 6.0-7.5
Radish 6.0-7.0
Raspberry 5.0-6.5
Rhododendron 4.5-6.0
Rhubarb 5.5-7.0
Rice 5.0-6.5
Rose – Climbing 6.0-7.0
Rose – Hybrid Tea 5.5-7.0
Rose – RamblIng 5.5-7.0
Rosemary 5.0-6.0
Rubber Plant 5.0-6.0
Sage 5.5-6.5
Salvia 6.0-7.5
Sansevieria 4.5-7.0
Santpaulia 6.0-7.0
Saxifraga 6.0-8.0
Scabiosa 5.0-7.5
SchizanthUs 6.0-7.0
Scilla 6.0-8.0
Sea Grape 5.0-6.5
Sedum 6.0-8.0
Selaginella 6.0-7.0
Senecio 6.0-7.0
Shallot 5.5-7.0
Shrimp Plant 5.5-6.5
Snapdragon 5.5-7.0
Snowdrop 6.0-8.0
Soapwort 6.0-7.5
Sorghum 5.5-75
Soyabean 5.5-6.5
Spanish Bayonet 5.5-7.0
Spearmint 5.5-7.5
Speedwell 5.5-6.5
Spider Plant 6.0-7.5
Spinach 6.0-7.5
Spirea 6.0-7.5
Spruce 4.0-5.0
Star of Bethlehem 6.0-8.0
Stock 6.0-7.5
Stonecrop 6.5-7.5
Strawberry 5.0-7.5
Succulents 5.0-6.5
Sumach 5.0-6.5
Sunflower 6.0-7.5
Swede 5.5-7.0
Sweet William 6.0-7.5
Syringa 6.0-8.0
Tamarix 6.5-8.0
Thunbergia 5.5-7.5
Thyme 5.5-7.0
Tobacco 5.5-7.5
Tomato 5.5-7.5
TrillIum 5.0-6.5
Tulip 6.0-7.0
Turk’s Cap 6.0-7.0
Turnip 5.5-7.0
Umbrella Tree 5.0-7.5
Velvet Plant 5.5-6.5
Venus Flytrap 4.0-5.0
Verbena 6.0-8.0
Viburnum 5.0-7.5
Vinca 6.0-7.5
Viola 5.5-6.5
Violet 5.0-7.5
Violet Flame 6.0-7.0
Virginia Creeper 5.0-7.5
Wallflower 5.5-7.5
Wandering Jew 5.0-6.0
Water Cress 6.0-8.0
Water Lily 5.5-6.5
Watermelon 5.5-6.5
Weeping Fig 5.0-6.0
Weyela 6.0-7.0
Winter Creeper 5.5-7.0
Wistine 6.0-8.0
Yucca 6.0-8.0
Zebra Plant 5.0-6.0
Zinna 5.5-7.5