Greek Yarrow is a slow-growing, tidy, dense evergreen ground cover. This beauty is a reliable heavy-bloomer bearing bright white clusters of tiny flowers for many weeks in late spring. Attracts bees and butterflies.
Western White Yarrow is a tough evergreen native that has fragrant, lacy foliage with dense umbels of tiny white flowers in summer. Can spread. Great attractor for beneficial insects. Tolerates variety of soil conditions. Pollinators: Butterflies and native bees. More information here.
Woolly Yarrow is a vigorous, low growing, evergreen ground cover forming tight clumps of charming, fuzzy grey-green leaves.Clusters of cheerful yellow blossoms pop up in late spring. Attracts bees and butterflies.
A natural hybrid from Bulgaria, this unusual and charming miniature yarrow produces clumps of small white flowers over carpets of attractive silvery leaves. Expanding gradually by root, this plant can form loose colonies.
Persian Stonecress forms handsome tight mounds of unusual deep blue-green foliage which is completely evergreen. The plant is covered with cheerful pink blossoms in late spring to early summer.Can seed out fairly aggressively.
This compact Agastache, or ‘Hummingbird Mint’ bears dozens of upright stalks of purple tubular flowers which–of course!–attract hummingbirds. Because of its compact form, it can be used to create spectacular small ‘hedges’, bringing color to the late summer garden.
Threadleaf Giant Hyssop has numerous spikes of uniquely-colored orange-purple tubular flowers over fragrant, finely divided leaves. It blooms in the heat of mid-summer and persists into fall. Outstanding hummingbird plant and nectar source for bees. More info here.
Pearly Everlasting is a sturdy, undemanding native wildflower that can be grown in dramatic drifts in sun or part shade.Hundreds of glowing, white flowers atop woolly, erect stems account for its “pearly” appearance. Fine food source for butterflies. More info here and here.
Rocky Mountain Columbine: Glorious light to deep blue flowers 2-3in across sometimes bi-colored with white. An excellent border perennial, grand for cutting, in bloom for several weeks and will grow in sun or light shade. Pollinators: bumblebees, hawk moths. Tolerates clay. More info here.
Golden-spurred Columbine, a native of the canyons of the Southwest produces fragrant cheerful yellow flowers with long outward-curving spurs In late spring. The fragrant blooms rise on slender stems above beautiful blue-green, fernlike foliage. Tolerates clay.
Amazingly tight, hard mats of silver-green triangular foliage are sprinkled with tiny white flowers in late spring. A fine and rarely available alpine from Spain. Exquisite rock garden plant, evergreen.
King’s Sandwort: The long grass-like leaves of this native sandwort are evergreen. In early spring they are decorated by an open spray of delicate white flowers. Tidy. Ideal for a rock garden or edging a pathway.
Mountain Sandwort is a classy little alpine or rock garden plant. It forms a low evergreen cushion of dark green leaves, bearing loads of large white flowers during the spring and early summer. Great for edging paths, between flagstones, in walls or rock gardens.
The tightly packed mat of gray-green leaves is so dense that it almost resembles a lichen. An excellent plant for rock gardens, Spanish Sandwort is also a great filler between pavers and flagstones. Evergreen.
Narrow Leaf Milkweed, native to Southern Idaho, is smaller and more drought-tolerant than the better-known Showy Milkweed. Mauve-pink flowers emerge in mid-summer. With extra water, bloom time is extended. Host plant for Monarch butterflies.
Showy Milkweed was once common, but modern agricultural techniques have largely eradicated this crucial pollinator plant. Milkweed provides larval food for the dwindling Monarch butterfly. It is tall and beautiful, but spreads through the garden by root–so choose the planting site with care!
Despite its common name, the flowers of Sky Blue Aster are more lavender than blue. But this Aster puts on a brilliant show in fall, each plant covered with hundreds of beautiful blooms. Growing well in almost any soil, from dry sand to moist loam, it attracts butterflies and bees.
Snow Flurry is a fall-blooming Aster that creates low-growing dense ground cover carpeted with tiny white flowers in September and October. A good strong grower and a totally new look and use for Asters! Makes an excellent container plant. Cut back in spring. Attracts native bees, honeybees and butterflies.
False Aster is a vigorous perennial that comes back from its roots every year to produce a veritable cloud of white blossoms in fall. Hundreds of white, aster-like flowers cover this 3-4’ tall plant, creating a stunning late season focal point.
Hartweg’s Sundrops has freely flowering mounds with trailing stems of grey-green leaves and cheerful, clear yellow blossoms all summer. Easy-and reliable. Needs well-drained soil. May be slow to emerge in spring, but flowers continuously through fall. Attracts: butterflies and bees.
Harebells is a lovely little wildflower is a native to most of the U.S., including Idaho. Its nodding blue flowers are held on wiry stems above attractive basal foliage. Great for borders, rock gardens. Pollinators: native bees. More info here.
Jupiter’s Beard produces masses of crimson flowers fading to pink from late spring right through the summer. Periodic deadheading will enhance the bloom even more. Attracts Swallowtails and Monarchs. Can seed out somewhat aggressively.
Valuable as a shade-tolerant groundcover, Plumbago will also grow in full sun. Glossy deep green leaves and lovely blue flowers with striking red calyces make this a most attractive spreading groundcover. The plant vanishes in winter, but comes back reliably each spring.
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