Overview
Kniphofia 'Sunningdale Yellow' 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. Kniphofia 'Sunningdale Yellow' 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, beds, containers and cut flowers.
About
Kniphofia 'Sunningdale Yellow' is a clump-forming, upright perennial in the Asphodelaceae, commonly grown for borders and cut flowers. Plants have narrow, arching, strap-shaped or grassy leaves and may be evergreen or deciduous. It prefers full sun on fertile sandy or loamy soil that is neutral to slightly acid and holds moisture through summer while draining in winter. Best placed on a south- or west-facing site and tolerates both exposed and sheltered positions.
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 'Sunningdale Yellow' sits within the genus Kniphofia (Asphodelaceae) and is cultivated as a perennial for structural presence in planting schemes and for cutting. The plant forms upright clumps with narrow, strap-like leaves that can be evergreen or die back, making it useful where a grassy texture is required in beds and borders. Position the plant in full sun on a fertile sandy or loamy soil with a neutral to slightly acid reaction. Soil should retain moisture during the summer growing season but be free-draining through winter to avoid root waterlogging. A south- or west-facing aspect suits it best, and it will tolerate either exposed or more sheltered sites. Hardiness is rated H4–H6 (average to very hardy), so it is appropriate for much of the UK garden range and aligns with USDA zones 5–9. Use Kniphofia 'Sunningdale Yellow' in mixed herbaceous borders, gravel beds, large containers or as a source of cut flowers. In containers choose a compost that balances summer moisture retention with winter drainage and protect the crown in the coldest conditions on the lowest end of its hardiness range. Harvest stems for indoor display during the June to September flowering period when blooms are at their best.
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 'Sunningdale Yellow' size, habit and characteristics
- Plant type
- Perennial
- Habit
- Clump-forming, upright
- Foliage
- Evergreen or deciduous; narrow, arching, strap-shaped or grassy
- Suggested uses
- Borders, beds, containers, cut flowers
Care notes
Pruning and caring for Kniphofia 'Sunningdale Yellow'
- 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 'Sunningdale Yellow'?
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 'Sunningdale Yellow'?
Kniphofia 'Sunningdale Yellow' prefers full sun. It suits exposed or sheltered positions.
What soil does Kniphofia 'Sunningdale Yellow' need?
Kniphofia 'Sunningdale Yellow' 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 'Sunningdale Yellow'?
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.
Is Kniphofia 'Sunningdale Yellow' hardy in the UK?
Kniphofia 'Sunningdale Yellow' 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 'Sunningdale Yellow'?
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'