Red hot poker

Sun

Full sun; flowering is reduced in shade.

Water

Water regularly while establishing. Established clumps tolerate short dry spells, but flower best with moisture during active growth; avoid waterlogged soil.

Soil

Well-drained sandy or loamy soil, moderately fertile and acidic to alkaline. Improve drainage before planting in heavy clay.

Height

3-5 ft (0.9-1.5 m), including flower spikes

Spread

2-3 ft (0.6-0.9 m)

Flowers

Summer, sometimes extending into early autumn; spikes usually open red or orange and fade to yellow from the bottom upwards.

Foliage

Long, narrow, arching green leaves form a dense basal clump. Usually evergreen in mild climates, but partly or fully deciduous in cold winters.

Growth

Moderate; develops into a substantial clump over several years.

Care needed

Medium

• Plant with the crown at soil level in a sunny position that drains freely.
• Water deeply during establishment and prolonged dry spells while plants are growing.
• Apply a light balanced fertiliser in spring if soil is poor; avoid heavy feeding.
• Keep mulch away from the crown; in cold regions, mulch around the root zone after the ground cools.
• Divide crowded clumps in spring when flowering declines, usually every three to five years.

Pruning. Cut spent flower stalks down to the base unless you want seed. Leave healthy foliage through winter, then remove dead and damaged leaves in spring without cutting into the crown.

Early spring

Remove dead foliage and check that the crown has not rotted during winter.

Spring

Plant or divide clumps as growth starts; water divisions regularly until established.

Spring

Apply a light feed on poor soil and renew mulch without covering the crown.

Summer

Water during prolonged dry weather and remove finished flower stalks.

Early autumn

Remove seed heads where self-seeding or escape into nearby habitat is a concern.

Late autumn

Leave foliage in place and check that winter rain can drain away from the clump.

• Plant in small groups through a sunny mixed border to give repeated upright accents.
• Combine with ornamental grasses for a contrast between dense flower spikes and loose, moving foliage.
• Pair with orange, yellow and purple flowers in a hot-colour border.
• Use among gravel and drought-tolerant perennials where the soil drains freely.

Garden styles it suits: Architectural minimal, Hot border, Dry gravel garden, Cottage garden, New perennial (prairie) and Mediterranean.

Plant it with: Catmint, Russian sage, Yarrow, Coneflower, Switchgrass and Stonecrop.

Wildlife: Nectar-rich flowers attract bees and, in North America, hummingbirds. Nectar-feeding birds may visit in Australia.

• Crown and root rot in wet soil: improve drainage or move the plant to a raised position; discard badly rotted clumps.
• Slugs and snails damaging young growth: check around the crown and use traps or an approved iron-phosphate bait where needed.
• Poor flowering in shade or crowded clumps: provide full sun and divide congested plants in spring.
• Winter leaf damage or crown loss in cold, wet sites: retain foliage through winter, improve drainage and shelter plants from cold winds.

Not known to be toxic to cats, dogs, horses or people; no part is recognised as poisonous. It is not an edible plant, and eating plant material may still cause stomach upset.

Where it spreads. Can escape gardens by seed. It is an invasive escape in parts of coastal California and an environmental weed in parts of southern Australia, including Victoria, Tasmania and South Australia. Check local weed guidance before planting near natural vegetation.

• Hybrid red hot pokers (Kniphofia hybrids)

  Often sold under the same common name, with flower colours and sizes beyond the usual species range. Appearance alone may not reliably separate them; check the plant's label and provenance.

• Rooper's red hot poker (Kniphofia rooperi)

  Usually has broader, strongly arching leaves and shorter, more rounded flower heads, most often appearing in late summer or autumn.

• Torch aloe (Aloe arborescens)

  Has thick, fleshy leaves with toothed edges on branching woody stems, unlike the thin leaves and basal clumps of red hot poker.

Kniphofia honours German physician and botanist Johann Hieronymus Kniphof, while uvaria refers to a grape-like cluster and the common name describes the glowing poker-shaped flower spikes.

Propagation. Divide established clumps in spring, keeping several growing points and healthy roots on each division. Seed can be sown in spring, but seedlings are variable and may differ from the parent, particularly where other kniphofias grow nearby.

Accepted botanical name

Kniphofia uvaria

In the US and Canada

Introduced in the lower 48 states.

Native range

Cape Provinces.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.