Ornamental · Asphodelaceae
Red-hot Poker
Kniphofia uvaria
Hand it full sun and dry feet, and red-hot poker sends up torches of flame-colored spikes all summer.
Full sun
Every 7–14 days
USDA 5–9
2–4 ft · 0.6–1.2 m
Overview
Red-hot poker earns its name. Each stem carries a dense torch of tubular flowers that open red in bud and fade to yellow as they age, so a single spike shows off two colors at once. The plant forms a grassy clump of arching leaves and belongs to the same family as the aloes, which shows in its tough, fleshy build.
This is an easygoing perennial for a sunny border, hardy across USDA zones 5 to 9. It asks for very little once settled and shrugs off heat, drought, and poor sandy ground. The one thing it won't forgive is wet, heavy soil sitting around its crown.
Pollinators love it. Hummingbirds and butterflies work the nectar-rich spikes through the warm months, while deer and rabbits tend to pass it by. A word of caution, though: it has gone invasive in some parts of the U.S., so check local guidance before you plant.
Care
The short version: full sun and sharp drainage are everything. Water it while it settles in, then let it fend for itself, keep the crown dry through winter, and cut spent spikes to keep the flowers coming.
Light
Give red-hot poker full sun, ideally at least 6 hours of direct light a day. It tolerates a little partial shade, but skimp on the sun and you'll get plenty of leaf and few of those signature spikes.
Water
Keep the soil moderately moist while the plant establishes, then ease right off, because a settled clump is genuinely drought tolerant. What it cannot stand is wet, heavy, or soggy ground, especially over winter, which rots the roots from below.
Soil
Plant in well-drained loam or sand with some compost worked in, anywhere from average to rich. It handles a wide pH band of 6.0 to 8.0, acidic through alkaline, so the one rule that matters is that water must drain away fast.
Humidity
Ordinary outdoor air suits it, so there's no humidity figure to chase. What counts far more is that the crown and roots stay on the dry side rather than damp.
Feeding
An all-purpose balanced fertilizer through the growing season is all it needs, applied as the plant seems to want it. This is a lean-soil plant at heart, so there's no call to push it hard.
Pruning
Cut spent flower spikes promptly and the plant pushes out more bloom. Leave the foliage standing through winter to shelter the crown, and in colder zones mulch over it or tie the leaves together so water can't collect and freeze in the heart of the plant.
Size & spacing
Clumps reach 2 to 4 feet (60 to 120 cm) tall in flower and spread 24 to 35 inches (60 to 90 cm) wide. Give each one that much room so the foliage stays open and air moves through it.
When to plant
Red-hot poker runs on a warm-season rhythm. Start seed indoors in late winter, set plants out or divide clumps in spring once frost has passed, or plant in fall, and the spikes light up from early summer into early autumn.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Start seed indoors in late winter, about 6 to 8 weeks before the last frost
- Plant: Transplant or divide in spring after frost danger passes, or in fall
- Harvest: Late spring to early fall, with main flush from early summer; spikes are red in bud and mature to yellow
Hardiness
USDA hardiness zones: 5–9
Temperature: down to -29°C
Troubleshooting
This is a tough plant, and most of its troubles trace back to one thing: soil that holds too much water. Watch the crown, the foliage, and the flower count, and you can head off problems early. Match what you see below, then act before it spreads.
Soft, brown crown and a plant that flops over
This is root rot, and it comes from soil that stays wet rather than from any bug or blight. The plant hates heavy, soggy ground, and winter wet sitting in the crown is the usual killer. Dig in sand or compost to open the soil up, ease off the watering, and move the plant to a raised, free-draining spot if the ground stays sodden.
Fix:
- Improve drainage by amending with organic matter or sand
- Avoid overwatering and standing water
- Relocate to a raised or well-drained site if soil stays wet
Few or no flower spikes through the season
Too little sun is the most common reason the spikes don't show. Give the plant a full-sun spot with at least 6 hours of direct light and the blooms follow. An old, crowded clump can also slow down, so leave established plants undisturbed and only split them once they get congested.
Fix:
- Site in full sun with at least 6 hours of direct light
- Leave established clumps undisturbed
- Divide only when clumps become overcrowded
Silvery streaks and stippled, distorted leaves
Tiny thrips are rasping at the foliage and leaving that silvery scarring behind. Look closely and you'll spot the slender insects on the leaves. Blast light infestations off with a jet of water, cut away badly marked foliage, and reach for an insecticidal control only if they dig in.
Fix:
- Hose off light infestations with water
- Remove and destroy heavily damaged foliage
- Treat persistent infestations with an appropriate insecticidal control
Toxicity
Good news for pet owners: red-hot poker is non-toxic across the board. The ASPCA clears torch lily for cats, dogs, and horses, and there's no poison to worry about for other animals or children. A stray nibble might cause a passing upset stomach at worst, the way any mouthful of greenery can.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
The ASPCA lists torch lily as non-toxic to cats, so a curious nibble is nothing to worry about. A cat that eats a lot of any plant might still cough up a little, but the leaves carry no poison.
Dogs None
Dogs can chew the foliage without coming to harm, since the plant is rated non-toxic to them as well. The worst you'll usually see from gorging on greenery is a brief upset stomach.
Horses None
Horses are safe around red-hot poker, which the ASPCA clears for them too. There's no toxin in the leaves or the flower spikes to cause trouble if one takes a bite.
Rabbits Safe
Nothing in the plant is poisonous to rabbits. They tend to leave it alone anyway, since it's noted as rabbit resistant, so most clumps go untouched in the border.
Livestock Safe
Grazing animals such as cattle, goats, and sheep face no poisoning risk from this plant. The tough, fibrous leaves are rarely a favorite, but a mouthful does no damage.
Birds Safe
The plant holds no toxin that would harm birds. Hummingbirds and other pollinators actually flock to the nectar-rich spikes, which is one of its real draws in the garden.
People Safe
Red-hot poker is harmless to handle and grow around children. No part of it is eaten, but there's no poison to fear if someone touches the leaves or a fallen flower.
Varieties
The named selections mostly play with color and size, from warm oranges to compact dwarfs. These are the ones you'll run into most.
Echo Mango
A selection that trades the usual fiery red for warm, mango-orange spikes.
Redhot Popsicle
A compact Popsicle-series plant that throws bright red-and-yellow spikes over an unusually long bloom season.
POCO Orange
A dwarf at roughly 20 to 24 inches tall, with clear orange flowers that suit a small bed or the front of a border.
How to propagate
You can bulk up red-hot poker by splitting a clump or sowing seed, though both ask for some patience before the plants flower.
DivisionModerate
Spring or fall · One to two growing seasons
Division is the surest way to make more, done in spring or fall. The catch is the root system, which is so tough and vigorous you may need a shovel, a saw, or even an axe to split a mature clump. The pieces settle in over one to two growing seasons, so leave anything that's already thriving where it stands.
SeedModerate
Start indoors in late winter or sow when ripe · Seed-grown plants may take a few years to reach flowering size
You can raise the species from seed, started indoors in late winter or sown straight away when it's ripe. Be patient, though, because seed-grown plants often take a few years to reach flowering size. Seed saved from a hybrid is a gamble, since those seedlings rarely come true to the parent.
Myths
Red-hot poker is poisonous to pets.
The fiery look fools people, but there's no poison here. The ASPCA classifies torch lily (Kniphofia) as non-toxic to dogs, cats, and horses, so a curious nibble is no cause for a vet call.
Cutting the foliage to the ground in fall protects the plant.
It does the opposite. Leave the leaves standing through winter so they shelter the crown, and in cold zones tie them together or mulch over them to stop water from pooling and freezing in the heart of the plant.