Soil PH Preferences for Garden Ornamentals

How to use the information in the chart. To make the best of the lists, group plants with similar soil requirements. Also, avoid planting trees, shrubs, vegetables, flowers and herbs in an unsuitable pH. For example, lilac bushes won’t do much if their feet are sitting in acid soil, while potatoes will be dotted with scab if the soil is too sweet. (Note: Don’t use them as your only guide because other factors may lead to poor performance.)

Plants are listed here in columns according to the pH level they prefer. Note that some are very sensitive to pH levels outside their tolerant range, in which case they will appear in more than one column even though they are colored yellow as being “sensitive”.

This green background means that this is an ideal pH for this plant.
This background is the ideal pH for this sensitive plant
This background means that this plant is very sensitive to the pH level of the soil.
pH 4.5 pH 5.25 pH 6.0 pH 6.75 pH 7.5
Anemone Begonia Ageratum Ageratum Ageratum
Autumn Gentians Calliopsis (Coreopsis) Alyssum Alyssum Annual Phlox
Gentian Chrysanthemum Avens (Geum) Annual phlox Cherry pie (Heliotrope)
Iris kaempferi Clarkia Baby’s breath (Gypsophila) Aster Cosmos (Cosmea)
Mecanopsis Clary (Salvia) Begonia Avens (Geum) Crocus
Pachysandra terminalis Cosmos (Cosmea) Burning bush (Kochia) Baby’s breath (Gypsophila) Day lily (Hemerocalis)
Grasses (Agrostis sp) Busy lizzie (Impatiens) Bachelor’s buttons (Ranunculus) Flax (Linum)
Lupin Calendula Bearded iris Forget me not (Myosotis)
Marigold (Tagetes) Calliopsis (Coreopsis) Begonia Geranium (Pelargonium)
Nasturtium (Tropaeolium) Campanula Bleeding heart (Dicentra) Hyacinth
Pachysandra terminalis Candytuft (Iberis) Bluebell (Scilla) Iceland poppy (Papaver)
Pansy (Viola) Carnation Burning bush (Kochia) Love lies bleeding (Amaranthus)
Phlox Chrysanth Busy lizzie (Imaptiens) Mignonette (Reseda)
Pick a back (Ptolmeia) Clarkia Calendula Nasturtium (Tropeaolium)
Primrose (Primula)Violet (Viola) Clary (Salvia) Candytuft (Iberis) Oxalis
Violet (Viola) Columbine (Aquilegia) Carnation (Dianthus) Peony
Coral bells (Heuchera) Cherry pie (Heliotrope) Petunia
Cosmos (Cosmea) Chrysanth Pinks (Dianthus)
Daffodil Clarkia Poppy (Papaver)
Dahlia Columbine (Aquilegia) Scilla
Delphinium Coral bells (Heuchera) Snowdrop (Galanthus)
Fuchsia Cosmos (Cosmea) Sweet pea (Lathyrus)
Gladiolus Crocus Sweet William (Dianthus)
Grasses (Agrostis sp) Daffodil Vebena
Hollyhock (Althea) Dahlia
Impatiens Daisy (Bellis)
Iris Delphinium
Lilies (Lilium) Euphorbia
Lobelia Feverfew (Chrysanth.)
Lupin Flax (Linum)
Marigold (Tagetes) Forget me not (Myosotis)
Michelmas daisy (Aster) Foxglove (Digitalis)
Mignonette (Reseda) Geranium
Narcissus Gladiolus
Nasturtium (Tropaeolium) Godetia
Pansy (Viola) Grasses
Petunia Hollyhock (Althea)
Phlox Hyacinth
Pick a back (Ptolmeia) Iceland poppy
Primrose (Primula) Impatiens
Primula Iris
Purslane (Portulaca) Polemonium (Jacobs Ladder)
Red hot poker (Kniphophia) Larkspur (Delphinium)
Rose (Rosa) Lily (Lilium)
Salvia Hemorocalis (Day Lily)
Scabious Lobelia
Snapdragon (Antirrhinum) Love lies bleeding
Stock Lupin
Sunflower (Helianthus) Marigold (Tagetes)
Tobacco (Nicotiana) Mignonette (Reseda)
Tulip Narcissus
Verbena Nasturtium
Viola Oxalis
Violet (Viola) Pansy (Viola)
Wallflower Peony
Waterlily (Nymphea) Petunia
Zinnia Pink (Dianthus)
Poppy (Papaver)
Primrose (Primula)
Red hot poker (Kniphophia)
Snapdragon (Antirrhinum)
Spurge (Euphorbia)
Snowdrop (Galanthus)
Stock (Mathiola)
Sunflower (Helianthus)
Sweet pea (Lathyrus)
Sweet william (Dianthus)
Tobacco (Nicotiana)
Violet (Viola)
Related  Soil Analysis By Leaf Testing For Correct Fertilization

pH Plant Preference Charts

More on Plant pH…

Identifying Your Soil Type
How pH Affects Plant Foods
Raising Soil pH

The Ready Store
"The doctor of the future will give no medicine, but will interest his patient in the care of the human frame, in diet and in the cause and prevention of disease" ~ Thomas Jefferson

1 thought on “Soil PH Preferences for Garden Ornamentals”

Leave a Comment