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Flowers and Plants for Alkaline Soils

Key to Symbols

Requires full sun for most of the day
Requires shade for at least 3 hours during the hottest part of the day
Little or no direct sunlight
Some or all parts of this plant may be toxic
Once established, these plants require little or no supplemental watering
These plants will tolerate some drought, but benefit from periodic watering
Needs regular weekly watering, more often in extreme heat
Keep constantly moist

 Common name  Botanical name Height Characteristics   USDA
Zone
Light  Water
Bears Breeches  Acanthus spinosus  4 ft.  Large spined leaves 7-10 7-10
Gold Plate Yarrow Achillea filipendulina 4 ft. Long blooming, bright yellow 6" flower clusters 3-10
Monkshood Aconitum 3 ft.  Divided Dark green foliage, spikes of dark blue, purple or white flowers 3-9
Stonecress  Aethionema 'Warley Rose'  6" Low growing shrubby evergreen, with long lasting bright rose-pink flowers  6-9
Madwort Alyssum spinosum 24" Compact shrub-like growth, tiny foliage, profusion of small white to pink flowers   8-9
Italian alkanet Anchusa italica 3-5 ft. Hairy 6" leaves, spikes of "true blue" flowers  3-9
Japanese Wind Flower  Anemone hupehensis 12" Spreading ground cover with single 2-3", white to pink flowers  6-10
Ladies Fingers  Anthyllis vulneraria 12-18" Silky, fern-like foliage mound, with small white or yellow blooms 7-9
Heartleaf Saxifrage Bergenia cordifolia 10-15" Glossy 8 inch, heart shaped leaves, spike of purple-pink flowers in late winter  3-9
Siberian Bugloss Brunnera macrophylla 18-24" Mounds of light green, heart shaped leaves, with clusters of tiny violet flowers on wirey stems in Spring  3-9
Milky Bellflower Campanula lactiflora 5 ft.  Large clumping plant with tall spikes of bell shaped purple/blue flowers in Summer 5-9
Cupids Dart Catananche caerulea  24" Compact clump of narrow grey/green leaves with 2 inch lavender flowers throughout the Summer 7-10
Jupiter's Beard Centranthus ruber 24-36" Loose clump of fleshy green leaves, dense long lasting clusters of small star shaped pink flowers Spring until Fall  5-10
Clematis davidiana Clematis heracleifolia  4 ft. Velvet textured grey/green foliage with dense clusters of small purplish flowers in mid Summer  3-9
Crown Vetch Coronilla varia 24"
Sprawling leafy stems with an abundance of pink clover-like flowers throughout the Summer
6-10
Yellow Corydalis  Corydalis lutea 12" Easy growing clumps of dainty green foliage, short sprays of soft yellow flowers throughout the Summer  6-10
Alpine Pinks Dianthus alpinus 4"-8" Cushions of neat, dark green foliage; typical "Pink" flowers in mid Summer 4-9
Leopard's Bane Doronicum pardaliances 3 ft.  Large heart shaped green foliage with bright yellow Daisy-like flowers from Spring to mid-Summer  5-9
Whitlow grass Draba aizoides 4" Small rosette of tiny grey or greel leaves; bright yellow flowers in late Spring 5-9
Foxtail Lily Eremurus robustus  24-36" Straplike green leaves with 24" spikes of pink flowers atop 8 ft. stems in late Spring    6-9
Goat's Rue Galega officinalis  3-5 ft.  Light green, lance shaped foliage with spikes of pink pea-like flowers in mid-Summer  5-10
Meadow Cranesbill Geranium pratense 36" Shiny green foliage turns bronze in the Fall, 1" saucer shaped flowers in mid_Summer  5-9
Dwarf Baby's Breath Gypsophila cerastioides  3" Spreading mat of greyish foliage; abundant clusters of pink or white flowers from late Spring til early Summer 5-10
Helen's Flower  Helenium autumnale 5 ft. Branching, leafy stems with yellow, orange or reddish Daisy-like flowers in the Fall 3-9
Coral Bells Heuchera sanguinea 12"-18"  Glossy, 3 inch, deeply lobed green to purple leaves; clusters of scarlet flowers on a stout 15" red stems in early-mid Spring  6-10
Purple Toadflax Linaria purpurea 3 ft.  Grey/green foliage with spikes of small violet colored, Snapdragon-like flowers in the Summer 6-10
Blue Flax  Linum narbonense 18" Clumps of soft green foliage, long lasting funnel shaped violet flowers in the Summer 5-10
Oregano Origanum amanum  6"-8"  Evergreen, small heart shaped green leaves; funnel shaped pink flowers mid-summer  8-10
Pasque Flower  Pulsatilla vulgaris  8"-10"  3 inch, pale purple flowers are followed by ferny foliage and then by attractive silky seed heads 5-9
Salvia nemorosa Salvia nemorosa 3 ft.  Narrow erect plant with irregular leaves, spikes of small purple to white blooms in the Summer 5-10
Soapwort  Saponaria ocymoides  4" 8" Forms thick mat of ground covering, fine foliage; hundreds of small pink to red flowers cover the plant in early Spring 4-10
Saxifrage Saxifraga bronchialis 8"  Forms a cushion of moss-like, fine foliage; cream colored flowers, spotted with red or pink in late Spring  4-9
Pincushion Flower Scabiosa caucasica 18-24"  Bushy, medium leaved plant, with stalks of 3 inch flower clusters blooming from June until frost  4-10
Hens and Chicks Sempervivum 1"-4"  Many varieties of succulent rosettes; unique flowers develop after the plant is a couple years old; needs excellent drainage zones vary
Checkerbloom Sidalcea malviflora 3-4 ft.    Sprawling growth of round leaves, loose heads of pink to white flowers throughout the Summer 6-10
Moss Campion Silene schafta  6-12"  Semi-evergreen clump of hairy, tongue shaped leaves, solitary purplish/red flowers appear on wirey stems in late Summer and Fall  6-10
Woolley Thyme Thymus pseudolanuginosus 1" Spreading mat of tiny, hairy, light green foliage; covered by tiny pink flowers in mid Summer. Several aromatic Thymes are also available.  3-9
Purple Mullein Verbascum phoeniceum 2-4 ft.  Dark green rosette, purple or pink flowers form on low spikes in the Summer  6-10
Speedwell Veronica spicata 24"  Spreading clump of silvery, felt live foliage with spikes of violet blue flowers in the Summer 6-10