Red hot poker
Also known as
Torch lily, Tritoma, Poker plant, Red-hot poker
Keep this plantâs care guide close at hand.
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Kniphofia uvaria is a clump-forming, rhizomatous perennial in the Asphodelaceae, prized for its dramatic torch-like flower spikes that shift from red to orange to yellow as tubular florets open from the base upward. Native to South Africa, it forms fans of narrow, arching, grass-like leaves and sends up stout, leafless scapes from late spring through summer, with repeat flushes where conditions are favorable. Plants typically reach 2â5 ft (0.6â1.5 m) tall in bloom and attract hummingbirds, bees, and butterflies, making them excellent for wildlife-friendly borders. Best performance occurs in full sun and sharply drained, moderately fertile soil. Once established, it is drought-tolerant, yet prolonged winter wet can cause crown rotâraise the crown slightly and avoid heavy, waterlogged sites. Remove spent spikes to prolong flowering and tidy the clump; divide every 3â5 years to maintain vigor. Kniphofia uvaria is widely grown in temperate regions, where it lends strong vertical accents and vibrant, sunset colors to mixed borders, gravel gardens, and coastal plantings.
Taxonomy
Properties & Requirements
How to care for Red hot poker
Water
Water deeply but infrequently. Keep newly planted Kniphofia evenly moist for the first growing seasonâabout 1 inch (25 mm) of water per week, adjusting for rainfall and heat. Once established, allow the top 2â3 inches (5â8 cm) of soil to dry between waterings; in hot spells, a deep soak every 7â10 days is ideal. Avoid overhead irrigation late in the day and do not bury the crownâpersistent winter wet around the crown is the most common cause of rot.
Light
Provide full sun for best bloomâat least 6â8 hours of direct light daily. In very hot, inland climates, light afternoon shade can reduce stress and prolong flowering, but too much shade causes weak growth and floppy stems. Open exposures with good air movement keep foliage clean and reduce fungal issues. Space plants to avoid shading the crown by neighboring perennials or shrubs.
Nutrients
Feed lightlyâexcess nitrogen produces lush leaves at the expense of flowers. In spring, scratch in a modest amount of a low-n, higher-phosphorus, higher-potassium fertilizer (e.g., 5-10-10) or top-dress with compost and a handful of bone meal. In poor soils, a second light feed after the first bloom flush can encourage rebloom. Container plants benefit from a half-strength liquid bloom formula every 4â6 weeks during active growth. Stop feeding 6â8 weeks before first frost.
Temperature
Hardy in USDA Zones 5â9 (Zone 5 with protection and excellent drainage). Ideal growing temperatures are 60â85°F (16â29°C). Plants tolerate heat into the 90s°F (mid 30s°C) if soil moisture is adequate, but resent cold, wet soils. In colder regions, site on a slope or raised bed, mulch lightly after the ground freezes, and remove heavy winter mulch in early spring. Protect crowns from standing water below 40°F (4°C). Evergreen to semi-evergreen in mild winters.
