Ornamental · Asteraceae
Blazing Star
Liatris spicata
Drop the corms in once and blazing star fires up tall purple spikes for the bees every single summer.
Full sun
USDA 3–8
2–4 ft · 0.6–1.2 m
Overview
Blazing star charges into the summer garden with something most perennials cannot match. Instead of the usual wide, flat flowers, it rockets up tall, slim spikes crammed with dense purple buds that burst into a fuzzy column, and a stand of them in bloom pulls butterflies and bees in from across the whole yard. It grows from a corm, storms back on its own every year, and asks next to nothing once it takes hold.
The real payoff shows up at bloom. Most spike flowers open from the bottom up, but blazing star opens from the top down, so the tip is winding down while the base is still firing off new color. Those grassy leaves and stiff stems drive strong vertical lines into a bed that most perennials just cannot deliver, whether you run the full-height species or a shorter powerhouse like 'Kobold'.
Best of all, it makes success easy in a sunny, well-drained spot. Hand it full sun and ground that drains, and it shrugs off heat, drought, and poor soil the moment its roots dig in. The one thing that stops it cold is wet feet in winter, which rots the corm faster than any pest or disease can.
Care
The short version: full sun and average, well-drained soil, steady water that first season and far less after, and a site that never stays soggy through winter.
Light
Hand blazing star full sun and watch it thrive. It scrapes by in partial shade, but there the stems stretch, weaken, and flop, so the more sun you throw at it, the sturdier and more upright it powers up.
Water
Keep it watered through the first growing season to lock the roots in. After that it turns fairly drought tolerant and barely needs a thing, and it will always take running dry over sitting wet, above all through winter.
Soil
It grabs hold in almost any well-drained soil, loam, sand, or clay, and it even shrugs off poor ground. A pH anywhere from 6.0 to 8.0 keeps it happy, so drainage, not richness, is the one thing to nail.
Humidity
Plain outdoor air is all it demands, so skip chasing a number. Good airflow does the heavy lifting here, since crowded, still conditions are exactly what hand powdery mildew and rust their opening.
Feeding
This lean-soil prairie plant is not a heavy feeder, so go light. One quick feeding before growth kicks off in spring is plenty, and dumping on fertilizer only pumps out soft, floppy stems that cannot hold their flowers up.
Pruning
Cut the spent flower stalks once they wrap up, but leave the foliage and hollow stems standing through winter to shelter native bees and feed songbirds, then cut them back in early spring. Tall stems in rich, moist soil may call for a stake.
Size & spacing
Plants shoot up to 2 to 4 feet (60 to 120 cm) in a narrow clump. Space them about 12 to 15 inches apart so air blows through freely and every spike gets room to stand tall.
When to plant
Blazing star is a tough perennial that thrives across zones 3 to 8. Push the corms or young plants into the ground in early spring, or plant container-grown stock again in early fall, and the flower spikes rocket up in mid- to late summer.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Early spring; seed germinates in 20-45 days and benefits from 4-6 weeks cold moist stratification
- Plant: Plant corms or container plants in early spring; container-grown plants may also be set out in early fall, spaced 12-15 inches apart
- Harvest: Blooms mid- to late summer (July-August), with dense purple flower spikes opening from the top down
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Blazing star throws very few problems your way, and nearly all of them chase back to one culprit: ground that holds too much water. Keep an eager eye on the stems and leaves as the season rolls on, and jump in early before a spot of fungus or a soggy corm gains ground. Match what you spot below, then move while it still turns things around.
A plant that wilts fast with a soft, rotting corm
This is the one that actually bites: soggy, poorly drained ground unleashes stem and corm rot, and soil that stays wet all winter sets it up. Once the corm rots there is no rescuing it, so dig the plant out along with the tainted soil around it. Nail the real fix by sorting out drainage and keeping blazing star clear of any spot that holds water.
Fix:
- Improve drainage and avoid wet sites
- Remove and discard affected plants and surrounding infected soil
Tall flower stems tipping and bending over
Stems that keel over are running on soft, weak growth, the kind that soil packed with too much richness or moisture pushes out, and shade drags them down further. Get the plant into full sun and leaner ground, prop the tallest stems with a stake, or grab a compact cultivar like 'Kobold' that powers up straight and holds its own.
Fix:
- Stake or provide support for tall stems
- Site in full sun and average, well-drained soil rather than rich, moist beds
- Choose compact cultivars such as 'Kobold'
A white powdery coating creeping over the leaves
That dusty white film is powdery mildew, a fungus that pounces late in the season when plants crowd together and the air goes still. Break its momentum fast: open the clump up with more spacing or a good thinning, and pull the worst leaves so it runs out of places to jump.
Fix:
- Improve air circulation by spacing and thinning plants
- Remove and dispose of badly affected foliage
Orange to brown pustules popping up on the leaves
Flip a leaf and find raised, rust-colored spots dotting the underside, and you have caught rust fungi in the act. Strip and destroy the marked leaves before the spores take off, then open the planting so air rushes through and the foliage dries fast once the rain quits.
Fix:
- Remove and destroy infected leaves
- Improve spacing and air circulation
Toxicity
Fantastic news for anyone with pets or kids running around: blazing star is safe all around. The ASPCA lists it as non-toxic to cats, dogs, and horses, and nothing in the leaves, stems, or corms poisons people or grazing animals. The worst a big mouthful is likely to kick up is a passing stomach upset.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Great news for cat owners, because the ASPCA lists blazing star as non-toxic to cats, so a nibble means nothing. A cat that really piles into any plant might bring it back up, but chalk that up to the rough leaves, not poison.
Dogs None
Dogs get the all-clear too, since not a thing in the leaves, stems, or corms is toxic. The most a nosy dog stands to gain from a big mouthful is a quick round of mild stomach upset.
Horses None
Horses can graze right up to blazing star and come away fine, since the plant packs nothing poisonous to them.
Rabbits None
Rabbits and other small pets can chomp the foliage without a hitch. It is a meadow wildflower they would run into out in the wild anyway.
Livestock None
Cattle, goats, and sheep face zero danger from blazing star in the pasture, since it holds no toxins that trouble grazing animals.
Birds None
Birds do great around it, and songbirds like goldfinches actively hunt down the ripe seed heads all the way through fall and winter.
People None
No part of blazing star poisons people either. It earns its keep for the flowers, not the plate, so there is no call to eat it, but a stray touch or taste does no harm at all.
Varieties
Most of the named blazing stars come bred for punchy color or a tidier height, and these are the ones you will spot most often at the garden center.
Kobold
This compact, deep-purple standout stays short enough to hold itself upright, which makes it a winner right at the front of a border.
Floristan White
Gardeners grab this white-flowered form for cutting, since those clean spikes keep going strong once they land in a vase.
Floristan Violett
This violet-flowered selection sends up stems tough enough to cut and carry, which is exactly why florists keep reaching for it.
Alba
A pure white form that caps out around 18 inches, staying shorter than the species and slotting right into a small bed.
How to propagate
Ready to multiply your blazing star? Split an established clump or start from seed, and note that one route rushes you to flowers far quicker than the other.
DivisionEasy
Spring, just as leaves emerge · Establishes over one to two seasons; clumps can be divided every few years
Dividing an established clump is the fastest, surest way to multiply your stock. In spring, right as the leaves push through, dig the clump and pull or cut the corms and tuberous roots apart, keeping at least one eye on every piece. The fresh divisions come up true to the parent, and while they settle in slowly, taking a season or two to bulk up, each one repays the wait.
SeedModerate
Early spring indoors or direct sow, or fall sow outdoors · Seedlings typically bloom in their second or third year
Seed rewards a patient grower. It fires up in 20 to 45 days, but only once a cold spell wakes it, so hand the seed 4 to 6 weeks of cold, moist chilling first or sow it outdoors in fall and let winter do the heavy lifting. From there a seedling charges through its second or third year before it throws up that first flower spike.
Myths
Blazing star is poisonous to dogs and cats.
Shake off that worry, because the ASPCA drops blazing star right onto the list of plants that are not toxic to dogs and cats. Like any plant, a pet that wolfs down a big mouthful might land a mild upset stomach, but there is no poison in play.
Liatris spikes open from the bottom up like most spike flowers.
Blazing star flips the script that nearly every other spike flower follows. It blooms from the top of the spike downward, so the tip is already fading while the lowest buds are just cracking open.