(Dwarf Wooly Yarrow)

Silvery-leaved, low-growing and drought tolerant, this is the perfect small yarrow for rock gardens and sunny border edges. A hybrid of the species Achillea clavennae and Achillea tomentosa, it forms a mat of narrow, gray-green, minutely toothed leaves. Loose, flattened clusters of buttery, pale primrose flowers bloom on short stems from late spring to midsummer. These are attractive to butterflies and have a soft, pretty appearance. Regular deadheading may extend flowering.

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(Dwarf Wooly Yarrow, King Edward Yarrow)

Silvery-leaved, low-growing and drought tolerant, this is the perfect small yarrow for rock gardens and sunny border edges. A cross between the species Achillea clavennae and Achillea tomentosa, 'King Edward' forms a mat of narrow, gray-green, minutely toothed leaves. Loose, flattened clusters of buttery, pale primrose flowers bloom on short stems from late spring to midsummer. These are attractive to butterflies and have a soft, pretty appearance. Regular deadheading may extend...

(Monkshood, Sparks Monkshood)

A hybrid tuberous monkshood, 'Sparks Variety' is notable for its tall, thin stems bearing deeply lobed leaves and a terminal branched cluster of deep-violet flowers. Draped with a curious petal-like bract that resembles a hood, the eye-catching flowers give the plant its common name.

This perennial needs well-drained soil with uninterrupted moisture. It grows and flowers best in cool soil and partial sun but will tolerate full sun. The stems may need staking. Note that all parts of the plant...

(Carmichael's Monkshood)

Autumn flowered monkshood is a tuberous-rooted perennial originally from China and valued for its late season bloom. The leaves are produced in mounds and are delphinium-like, dark green, deeply dissected, toothed and have a leathery texture. Deep blue-violet flowers, each curiously shaped like a helmet or hood are produced atop leafy, tall, stately spikes in late summer and fall.

Plant monkshood in evenly moist but not wet soil. Full sun to partly shady locations are preferred. Monkshood grows...

(Carmichael's Monkshood)

Autumn flowered monkshood is a tuberous-rooted perennial originally from China and valued for its late season bloom. The Arendsii group hybrids are known for their compact, sturdy flower spikes, large leaves and azure-blue blooms. The leaves are produced in mounds and are delphinium-like, green, deeply dissected, toothed and have a leathery texture. Deep blue flowers, each curiously shaped like a helmet or hood are produced atop leafy, tall, stately spikes in late summer and fall.

Plant monkshood...

(Bicolored Monkshood, Monkshood)

With both handsome foliage and a wondrous display of blue, white or violet flowers in late summer or early fall, bicolored monkshood is a hybrid resulting from the cross of Aconitum napellus and Aconitum variegatum. The glossy leaves are produced in mounds and are dark-green, deeply dissected, toothed and have a leathery texture. Deep blue-violet and white flowers, each shaped like a helmet are produced in loose clusters atop leafy, tall spikes in late summer and fall.

Plant...

(Sweet Flag)

Calamus is an herbaceous perennial that is native throughout much of the United States and Canada. It has inconspicuous flowers and is grown primarily for its tall, upright, broad, iris-like foliage. One particularly attractive cultivar is 'Argenteostriatus', which has beautifully variegated leaves. These plants spread by rhizomes and grow best in moist boggy areas with full to partial sun. Semi-aquatic in nature, calamus works well in naturalistic plantings along waterways or in gardens with moist...

(Striped Sweet Flag, Sweet Flag)

Striped sweet flag, or striped calamus, is an herbaceous perennial that is native throughout much of the United States and Canada. It has inconspicuous flowers and is grown primarily for its tall, upright, iris-like foliage that is beautifully variegated with cream striations. These plants spread by rhizomes and grow best in moist boggy areas with full to partial sun. Semi-aquatic in nature, striped sweet flag works well in naturalistic plantings along waterways or in gardens with moist fertile soil.

(Japanese Bugbane)

Robust, weeping, bottlebrush-like plumes of fragrant white flowers top this tall perennial's stems from midsummer to early fall. Japanese bugbane is a woodland perennial that forms a clump, and is native to Japan and extreme eastern Asia. This species tends to flower later than other bugbanes grown in gardens.

The glossy light to medium green leaves are compound - having three leaflets each and attached in groups of three on a leaf stalk. The individual leaflets are oval but are irregularly toothed....

(White Pearl Bugbane)

Nodding, bottlebrush-like plumes of fragrant, creamy-white flowers top the stems of 'White Pearl' from midsummer to early fall. It is a selection of Japanese bugbane, a woodland, clumping perennial native to Japan and parts of extreme eastern Asia. It blooms later than other bugbane species and cultivars.

The glossy, light to medium-green leaves are compound - having three leaflets each - and are borne in groups of three on each leaf stalk. The individual leaflets are oval and irregularly toothed....