Why is it called frostweed?

The stems split during the first hard freeze, pushing out ribbons of ice that look like delicate frost sculptures.

Does it spread aggressively?

It can self sow readily in ideal conditions, so deadheading helps if you want to limit its spread.

Plant guide

Frostweed.

Verbesina virginica

Pronounced ver-beh-SEE-nah vir-JIN-ih-kah

Also known as Virginia crownbeard, frostweed, white crownbeard

Verbesina virginica — Photo by mattmsa (CC0) via gbif

Frostweed is a fascinating native perennial known for its unique ability to create ice sculptures on its stems during the first hard frost. It is a fantastic choice for supporting pollinators like butterflies and bees in your garden. You will love how it brings a bit of wild beauty to the landscape.

Another photo of Frostweed — Photo by Hill Craddock (CC BY) via iNaturalist

At a glance

Care level: Easy
Plant type: Perennial
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 7 to 14 days
Mature size: 3 to 8 feet
Growth rate: Fast
Hardiness: USDA 5 to 9
Bloom time: Late summer to mid autumn

Care

Plant this in a spot with well draining soil and plenty of space to spread. Keep an eye out for wilting during dry spells, as it appreciates consistent moisture. It is a tough plant that handles most conditions quite well.

Watering: Water deeply when the top inch of soil feels dry to the touch.
Feeding: A light application of compost in early spring is usually plenty.
Pruning: Cut back the dead stems in late winter or early spring before new growth starts.
Repotting: This plant is best grown in the ground rather than in containers.
Soil: Moist to dry well draining soil
Soil pH: Neutral to slightly acidic
Temperature: -29 to 35°C
Humidity: 40 to 80%
Drought tolerance: Moderate
Lifespan: Perennial, typically 3 to 5 years.
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Water running straight through the pot without soaking in.

Safety

People: There is no significant toxicity reported for humans, but it is not intended for consumption.
Children: The plant is not inherently dangerous, but it is best to keep children from playing with the tall, brittle stems.
Contact allergens: Handling the stems may cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen can trigger seasonal allergies in some people during late summer.
Edibility: This plant is not considered edible and should not be consumed.

How to identify it

Winged stems with leafy ridges
Clusters of small white flowers
Large coarse serrated leaves
Tall branching habit

Height: 1.5 to 2.5m
Spread: 0.6 to 1.2m
Leaves: green, deciduous
Flowers: white, 1 to 2cm
Fruit: brown, late autumn

Problems to watch for

Powdery mildew · A white fungal growth on leaves often caused by poor air circulation.

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, division
When to plant: spring, autumn
Overwintering: Leave the stems standing through winter to enjoy the unique frost formations after freezing temperatures. You can cut the dead foliage back to the ground in early spring.
In containers: It is generally too large and rangy for typical containers.

Seed

Collect seeds in late autumn once the flower heads turn brown.
Sow seeds directly into the garden in autumn for natural stratification.
Keep the soil lightly moist until germination occurs in spring.

Plant this in the back of a border since it grows quite tall and can become leggy.

Grows well with

Blue Mistflower · They share similar moisture needs and bloom at the same time.
Goldenrod · These provide a beautiful color contrast in the late summer garden.

Similar species

Yellow Crownbeard · It is a close relative with a similar growth habit and flower structure.

Science

Family: Asteraceae
Genus: Verbesina
Order: Asterales
Class: Magnoliopsida
Native range: Southeastern and south central United States.
Conservation: It is secure across its native range and does not require special protection.

It is a hardy perennial that excels in moist, shaded woodland environments by providing late season nectar.

Value to wildlife: nectar source, larval host plant
Pollinators: bees, butterflies, moths
Uses: pollinator gardens, native plant borders, wildlife habitat

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 5/9
Temperature: 5/9
Moisture: 6/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Why is it called frostweed?: The stems split during the first hard freeze, pushing out ribbons of ice that look like delicate frost sculptures.
Does it spread aggressively?: It can self sow readily in ideal conditions, so deadheading helps if you want to limit its spread.

Where the name comes from

The genus name Verbesina comes from the resemblance of its leaves to the genus Verbena, while virginica refers to its discovery in Virginia.

Good to know

It is commonly called frostweed because ice crystals form on the stems after the first hard freeze.
The flowers are highly attractive to late season pollinators when other food sources are scarce.
It thrives in woodland edges where it can receive dappled light.

Keep your frostweed growing

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.