Overview
Kniphofia rooperi is a clump-forming, upright perennial in the genus Kniphofia, part of the Asphodelaceae family, with evergreen or deciduous; narrow, arching, strap-shaped or grassy foliage. It typically grows around 1.2 metres tall. Kniphofia rooperi grows best in full sun, and tolerates fertile sandy or loamy soil soils and neutral to slightly acid pH. Its UK hardiness is rated H4–H6. Suggested uses include borders, cut flowers and wildlife gardens. It is native to South Africa.
About
Kniphofia rooperi is a clump-forming, upright perennial reaching about 1.2 metres, notable for flattened, oval flowerheads borne on stout stems. Leaves are narrow, strap-shaped and arch from the crown and may be evergreen. Flowering runs from June to September, the blooms opening from green buds to red and then fading through yellow to brown. It suits sunny positions in fertile, moisture-retentive soil with winter drainage.
Wikipedia contributors, CC BY-SA 4.0 — Kniphofia rooperi
About the genus
Kniphofia is a genus of perennial flowering plants in the family Asphodelaceae, first described as a genus in 1794. All species of Kniphofia are native to Africa. Common names include tritoma, red hot poker, torch lily and poker plant.
Wikipedia contributors, "Kniphofia", CC BY-SA 4.0 — Kniphofia
In the garden
Kniphofia rooperi originates from South Africa and shows an architectural habit with upright stems rising above a mound of grass-like leaves. The plant typically reaches about 1.2 metres and produces flattened oval flowerheads that progress in colour as they open; flowering occurs from June to September. Plant it in full sun on a south- or west-facing site where the soil is fertile, sandy or loamy and neutral to slightly acid. Keep the root area reliably moist through the summer months but ensure the crown is not waterlogged over winter; the species prefers moisture-retentive summer conditions combined with good winter drainage. It tolerates exposed or sheltered sites and sits within UK hardiness H4–H6 (average to very hardy), so it will survive ordinary UK winters in most regions with typical garden care. Use Rooper's red-hot poker in mixed borders where its upright flower spikes add late-season structure, or grow it in wildlife-friendly areas to provide nectar. The stems also make useful cut flowers; cutting the heads for arrangements lets you bring their long, flattened blooms indoors while keeping the crown clear for the following season.
Growing conditions
Best soil and position for Kniphofia
- Sunlight
- Full sun
- Soil type
- Fertile sandy or loamy soil
- Soil pH
- Neutral to slightly acid
- Soil moisture
- Moisture-retentive in summer, well drained in winter
- Aspect
- South or west facing
- Exposure
- Exposed or sheltered
- UK hardiness
- H4–H6
Plant details
Kniphofia rooperi size, habit and characteristics
- Plant type
- Perennial
- Habit
- Clump-forming, upright
- Foliage
- Evergreen or deciduous; narrow, arching, strap-shaped or grassy
- Height
- 1.2 metres
- Suggested uses
- Borders, cut flowers, wildlife gardens
- Native to
- South Africa
Care notes
Pruning and caring for Kniphofia rooperi
- Cultivation
- What most red hot pokers want is summer moisture combined with winter dryness. Plant on a free-draining site, water generously while the spikes are forming, then protect the crowns of less hardy kinds with a dry mulch or by tying the leaves up over the centre in autumn.
- Pruning
- Remove faded spikes at the base. Cut deciduous foliage down in late autumn; on evergreens pull away dead leaves by hand rather than shearing the whole clump.
- Propagation
- Divide established clumps in late spring — autumn division risks rotting. Species germinate readily from seed but take two to three years to flower.
- Pest resistance
- Usually undemanding, but aphids, thrips, slugs and snails can all take advantage of the crown and new growth.
- Disease resistance
- Healthy in suitable conditions. Crown and root rot follow winter waterlogging.
Frequently asked questions
How do I grow Kniphofia rooperi?
What most red hot pokers want is summer moisture combined with winter dryness. Plant on a free-draining site, water generously while the spikes are forming, then protect the crowns of less hardy kinds with a dry mulch or by tying the leaves up over the centre in autumn.
Where is the best place to plant Kniphofia rooperi?
Kniphofia rooperi prefers full sun. It suits exposed or sheltered positions.
What soil does Kniphofia rooperi need?
Kniphofia rooperi grows best in fertile sandy or loamy soil soil. It prefers neutral to slightly acid soil. Aim for soil that stays moisture-retentive in summer to well drained in winter.
How do I prune Kniphofia rooperi?
Remove faded spikes at the base. Cut deciduous foliage down in late autumn; on evergreens pull away dead leaves by hand rather than shearing the whole clump.
How big does Kniphofia rooperi grow?
Kniphofia rooperi reaches a height of 1.2 metres.
Is Kniphofia rooperi hardy in the UK?
Kniphofia rooperi has an RHS hardiness rating of H4, meaning it is hardy through an average UK winter, tolerating -10 to -5°C.
How do I propagate Kniphofia rooperi?
Divide established clumps in late spring — autumn division risks rotting. Species germinate readily from seed but take two to three years to flower.
More in the Kniphofia genus
- Kniphofia 'Royal Standard'red-hot poker 'Royal Standard'
- Kniphofia gracilisRed Hot Poker
- Kniphofia rufaRed Hot Poker
- Kniphofia triangularisdwarf red-hot poker
- Kniphofia tuckii of gardensRed Hot Poker
- Kniphofia 'Ada'red-hot poker 'Ada'
- Kniphofia 'Erecta'red-hot poker 'Erecta'
- Kniphofia 'Goldelse'red-hot poker 'Goldelse'