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 coloured 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
AnemoneBegoniaAgeratumAgeratumAgeratum
Autumn GentiansCalliopsis (Coreopsis)AlyssumAlyssumAnnual Phlox
GentianChrysanthemumAvens (Geum)Annual phloxCherry pie (Heliotrope)
Iris kaempferiClarkiaBaby's breath (Gypsophila)AsterCosmos (Cosmea)
MecanopsisClary (Salvia)BegoniaAvens (Geum)Crocus
Pachysandra terminalisCosmos (Cosmea)Burning bush (Kochia)Baby's breath (Gypsophila)Day lily (Hemerocalis)
Grasses (Agrostis sp)Busy lizzie (Impatiens)Bachelor's buttons (Ranunculus)Flax (Linum)
LupinCalendulaBearded irisForget me not (Myosotis)
Marigold (Tagetes)Calliopsis (Coreopsis)BegoniaGeranium (Pelargonium)
Nasturtium (Tropaeolium)CampanulaBleeding heart (Dicentra)Hyacinth
Pachysandra terminalisCandytuft (Iberis)Bluebell (Scilla)Iceland poppy (Papaver)
Pansy (Viola)CarnationBurning bush (Kochia)Love lies bleeding (Amaranthus)
PhloxChrysanthBusy lizzie (Imaptiens)Mignonette (Reseda)
Pick a back (Ptolmeia)ClarkiaCalendulaNasturtium (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)ChrysanthPinks (Dianthus)
DaffodilClarkiaPoppy (Papaver)
DahliaColumbine (Aquilegia)Scilla
DelphiniumCoral bells (Heuchera)Snowdrop (Galanthus)
FuchsiaCosmos (Cosmea)Sweet pea (Lathyrus)
GladiolusCrocusSweet William (Dianthus)
Grasses (Agrostis sp)DaffodilVebena
Hollyhock (Althea)Dahlia
ImpatiensDaisy (Bellis)
IrisDelphinium
Lilies (Lilium)Euphorbia
LobeliaFeverfew (Chrysanth.)
LupinFlax (Linum)
Marigold (Tagetes)Forget me not (Myosotis)
Michelmas daisy (Aster)Foxglove (Digitalis)
Mignonette (Reseda)Geranium
NarcissusGladiolus
Nasturtium (Tropaeolium)Godetia
Pansy (Viola)Grasses
PetuniaHollyhock (Althea)
PhloxHyacinth
Pick a back (Ptolmeia)Iceland poppy
Primrose (Primula)Impatiens
PrimulaIris
Purslane (Portulaca)Polemonium (Jacobs Ladder)
Red hot poker (Kniphophia)Larkspur (Delphinium)
Rose (Rosa)Lily (Lilium)
SalviaHemorocalis (Day Lily)
ScabiousLobelia
Snapdragon (Antirrhinum)Love lies bleeding
StockLupin
Sunflower (Helianthus)Marigold (Tagetes)
Tobacco (Nicotiana)Mignonette (Reseda)
TulipNarcissus
VerbenaNasturtium
ViolaOxalis
Violet (Viola)Pansy (Viola)
WallflowerPeony
Waterlily (Nymphea)Petunia
ZinniaPink (Dianthus)
Poppy (Papaver)
Portulaca
Primrose (Primula)
Pyrethrum
Red hot poker (Kniphophia)
Salvia
Scabious
Scilla
Snapdragon (Antirrhinum)
Spurge (Euphorbia)
Snowdrop (Galanthus)
Stock (Mathiola)
Sunflower (Helianthus)
Sweet pea (Lathyrus)
Sweet william (Dianthus)
Tobacco (Nicotiana)
Tulip
Verbena
Viola
Violet (Viola)
Wallflower
Zinnia
pH Plant Preference Lists
Food Plants |  Ornamental Plants |  Trees |  Shrubs |  Potted Plants

See also...

Identifying Your Soil Type
How pH Affects Plant Foods
Finding Soil's pH
Raising Soil pH
Lowering Soil pH
pH Plant Preference Lists

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