Plant Library

An index of the perennial plants grown and offered at Glenraven.
All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Kalimeris incisa 'Blue Star'

Kalimeris incisa 'Blue Star'

Japanese Aster

10365772366135|Kalimeris incisa 'Blue Star'|Japanese Aster|

Shorter than other kalimeris, maintaining good winter silhouette. Glossy dark green foliage with impressive prolific succession of yellow-centered blue-rayed daisy-like flowers about three centimetres across from late spring onwards. Fine dense clean habit.

Underused genus producing lovely daisy flowers in profuse quantities atop densely branched stems. Easy-going, sturdy, long-lived, clump-forming plant blooming from late spring until fall. Often confused with asters but blooms earlier and longer. Allow season or two to settle in. No staking required.

|May–Sept|blue|dark green glossy|compact upright|borders; cottage gardens; long season interest|60|60|full sun to part shade|average|regular garden soil|low|blooms longer than asters; no staking needed; good winter silhouette; easy and sturdy; allow time to settle|yes|late spring to fall bloom; prolific flowers; glossy foliage|pollinators|4||blue daisy flowers; yellow centers; glossy dark foliage; prolific long blooming; compact; no staking; good winter silhouette|//glenravennursery.com/cdn/shop/files/placeholder_portrait.png?v=1766878564&width=800|
Knautia macedonica

Knautia macedonica

Macedonian Scabious

10365772464439|Knautia macedonica|Macedonian Scabious|

Exceptionally long flowering paired with ease of combination makes this very usable. Flowers appear as multitudes of tight burgundy buttons at tips of densely branched plants. First leaves in spring are almost entire, becoming more feathery as season progresses. The overall form is light and open.

Most at home in sunny well-drained border, tolerating regular garden soil and growing more upright in leaner soil. In rich soil, provide strong-shouldered neighbours for plants to lean on. Self-seeding occurs under appropriate conditions. Native to southeastern Europe. The extended bloom and airy habit make it excellent weaver.

|June–Oct|burgundy red|green|upright airy|borders; cottage gardens; naturalistic plantings; sunny sites|80|80|full sun|average|well-drained regular|low to moderate|exceptionally long flowering; self-seeds appropriately; more upright in lean soil; may lean in rich soil|moderate|continuous summer to fall bloom; burgundy buttons; airy form|pollinators|5||exceptionally long blooming; burgundy buttons; densely branched; light airy form; self-seeding; SE European native|//glenravennursery.com/cdn/shop/files/placeholder_portrait.png?v=1766878564&width=800|
Knautia macedonica 'Dark Red Sel'

Knautia macedonica 'Dark Red Sel'

Macedonian Scabious

10365772431671|Knautia macedonica 'Dark Red Sel'|Macedonian Scabious|

A darker selection of Macedonian scabious with deep burgundy-red button flowers. Maintains the long flowering period and airy branching habit of the species. The intensified colour provides stronger impact in borders. The light open form weaves well through neighbours.

Thrives in sunny well-drained positions with regular garden soil. Self-seeds but not invasively. The darker colour distinguishes it from typical species. Combines well with grasses, salvias, and other perennials. The extended flowering makes it valuable for season-long interest.

|June–Oct|dark burgundy red|green|upright airy|borders; cottage gardens; with grasses|80|80|full sun|average|well-drained regular|low to moderate|darker selection; long flowering; self-seeds appropriately; airy weaving habit|moderate|continuous summer to fall bloom; dark burgundy; airy form|pollinators|5||dark burgundy-red; long flowering; airy form; darker selection; button flowers; self-seeding|//glenravennursery.com/cdn/shop/files/placeholder_portrait.png?v=1766878564&width=800|
Kniphofia 'Ice Queen'

Kniphofia 'Ice Queen'

Red Hot Poker

10365772497207|Kniphofia 'Ice Queen'|Red Hot Poker|

A red hot poker with cool-toned flowers transitioning from pale coral buds to ivory-white. The upright spikes create strong vertical accents. More refined colour scheme than typical orange-red forms. Plants form substantial clumps of grassy foliage.

Requires well-drained soil, especially important for winter survival. The pale colour scheme works well in white gardens and with pastel combinations. The grassy foliage provides textural interest. Attractive to hummingbirds. Evergreen foliage in mild climates. Good drainage essential.

|July–Aug|coral to ivory white|green|upright clump|borders; white gardens; well-drained sites|100|50|full sun|average|well-drained essential|moderate|cool color scheme; requires excellent drainage for winter; evergreen in mild climates|moderate|summer bloom; grassy foliage; vertical spikes|hummingbirds; pollinators|6||pale coral to ivory-white; cool tones; vertical spikes; grassy foliage; refined color; well-draining essential|//glenravennursery.com/cdn/shop/files/placeholder_portrait.png?v=1766878564&width=800|