Redhot Poker
Kniphofia uvaria · Red Hot PokerUSDA | Grow Zone
5-9Outdoors all year in zones 5 to 9. Anywhere colder, keep it as a houseplant. Protect it below 20°F.
- Light
- Full sun, 6-8 hours
- Water
- When top inch is dry
- Humidity
- 40-60%
- Temperature
- 65-75°F (18-24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 3-5 ft tall, 2-3 ft wide
- Pets
- Non-toxic to pets and children
Kniphofia uvaria, commonly known as Red Hot Poker, is a striking perennial native to South Africa. Its vibrant, torch-like flowers attract pollinators and add unique color to gardens, making it a favorite among gardeners.
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Ideal temperature
65-75°F is where it grows fastest. Below 20°F cold damage starts.
Spacing and harvest
- Mature size
- 3-5 ft tall, 2-3 ft wide
- Plant apart
- 24-36 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Kniphofia uvaria prefers to be watered deeply but infrequently.
Water the plant when the top inch of soil feels dry, typically every 1-2 weeks, depending on weather conditions. In the growing season, increase frequency to once a week. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and browning leaf tips.
Light
This plant thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
Ideal placement is in a south or west-facing garden bed. While it can tolerate partial shade, too little light may result in reduced flowering and leggy growth.
Soil
Kniphofia uvaria prefers well-draining soil with a pH range of 6.0 to 7.0.
A sandy loam or a potting mix designed for perennials is recommended. Ensure good drainage to prevent waterlogging, which can lead to root rot.
Humidity
This species prefers moderate humidity levels, around 40-60%.
To increase humidity, mist the leaves or place a humidifier nearby. Signs of low humidity stress include browning leaf edges and stunted growth.
Temperature
The ideal temperature range for Kniphofia uvaria is between 65-75°F (18-24°C).
It is hardy in USDA zones 5-9 and can tolerate light frost. However, prolonged exposure to temperatures below 20°F (-6°C) may damage the plant.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar.
Fertilize every 4-6 weeks during the growing season, tapering off in late summer. Signs of nutrient deficiency include yellowing leaves and poor growth.
Pruning
Prune back the foliage in late winter or early spring before new growth starts.
Use sharp, clean pruning shears to remove dead or damaged leaves. Deadheading spent flowers can encourage more blooms and improve the plant's appearance.
Repotting
Repot Kniphofia uvaria every 2-3 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through division or seeds.
For division, carefully dig up the plant in early spring or fall, and separate the clumps into smaller sections, ensuring each has roots. Replant immediately. For seed propagation, collect seeds after flowering and sow them in spring, covering lightly with soil.
When it's unhappy
Yellow leaves
Why it happens
Often caused by over-watering or nutrient deficiency.
How to fix it
Adjust watering schedule and consider fertilizing to restore nutrient balance.
Root rot
Why it happens
Excess moisture in the soil or poor drainage.
How to fix it
Ensure proper drainage and reduce watering frequency. Remove affected roots and repot in fresh soil if necessary.
Wilting
Why it happens
Under-watering or extreme heat.
How to fix it
Check soil moisture and water thoroughly if dry. Provide shade during extreme heat.
Poor flowering
Why it happens
Insufficient sunlight or nutrient deficiency.
How to fix it
Ensure the plant receives full sun and consider fertilizing to promote blooming.
Browning leaf tips
Why it happens
Low humidity or inconsistent watering.
How to fix it
Increase humidity levels and maintain consistent watering to prevent stress.
Care through the year
Spring
In spring, prune back any dead foliage and prepare for new growth. Fertilize with a balanced fertilizer to support blooming.
Summer
During summer, ensure consistent watering, especially in hot weather. Deadhead spent flowers to encourage more blooms.
Fall
In fall, reduce watering as the plant begins to enter dormancy. Cut back the foliage after the first frost to prevent damage.
Winter
In winter, protect the plant from extreme cold by applying a layer of mulch around the base. Avoid over-watering during this dormant period.
Toxicity & Safety
Kniphofia uvaria is generally considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. It is best to keep all plants out of reach of curious pets and children.
Good to know
Why are my Kniphofia uvaria leaves turning yellow?
Yellow leaves on Kniphofia uvaria can indicate over-watering or a lack of nutrients. Check the soil moisture and consider fertilizing to restore health.
How often should I water my Red Hot Poker?
Water your Red Hot Poker when the top inch of soil feels dry, typically every 1-2 weeks. Adjust frequency based on weather conditions.
What type of soil is best for Kniphofia uvaria?
Kniphofia uvaria thrives in well-draining soil with a pH of 6.0 to 7.0. A sandy loam or quality potting mix is ideal for optimal growth.
How do I propagate Kniphofia uvaria?
You can propagate Kniphofia uvaria through division or seeds. Division is best done in early spring or fall, while seeds should be sown in spring.
When should I prune my Red Hot Poker?
Prune your Red Hot Poker in late winter or early spring before new growth appears. Remove dead or damaged leaves to encourage healthy growth.
What are the ideal growing conditions for Kniphofia uvaria?
Kniphofia uvaria prefers full sun, well-draining soil, and moderate humidity. It thrives in USDA zones 5-9 and requires regular watering during the growing season.
How do I increase humidity for my Kniphofia uvaria?
To increase humidity, mist the leaves regularly or use a humidifier nearby. This helps prevent browning leaf tips and supports healthy growth.
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