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Native woodland perennial
Asteraceae
Native woodland perennials for pollinators
White Snakeroot – Seeds
Ageratina altissima
Product code : AKENE-0020
Native partial-shade perennial with airy clusters of late white flowers. White snakeroot brightens woodland gardens and supports bees, butterflies, hoverflies, and other pollinators into early fall.
- Quantity
- About 75 seeds
- Exposure
- Light shade to partial shade
- Life cycle
- Perennial
- Hardiness
- Zones 3 to 8
Discover the plant
Common nameWhite Snakeroot
FamilyAsteraceae
GenusAgeratina
Speciesaltissima
Cultivar
TypeNative woodland perennial
Botanical nameAgeratina altissima
Reproducible seedsYes
White Snakeroot (Ageratina altissima) is a native woodland perennial valued for its airy, luminous white flowers. Upright stems carry dark green, opposite leaves that are broadly oval and strongly toothed. From late summer into early fall, numerous small white flower heads gather in flattened clusters that brighten shaded garden areas. This late bloom period extends seasonal interest after many other perennials have finished flowering. Exceptionally hardy, white snakeroot overwinters reliably in Quebec and gradually forms natural-looking colonies where conditions are suitable. Its dense foliage and fresh white flowers give woodland borders a full, layered appearance without requiring a formal garden setting.
White snakeroot prefers light shade or partial shade in humus-rich, moist, well-drained soil. It tolerates more sun where moisture remains consistent, but foliage may suffer in hot, dry exposure. A mulch of shredded leaves or compost helps keep the root zone cool and recreates the conditions of a natural woodland floor. Water during extended dry periods, especially while plants are becoming established. A light spring application of mature compost is generally sufficient. In Quebec, dry stems may be removed before new spring growth begins or left standing through winter to shelter beneficial insects and provide structure in naturalized plantings.
White snakeroot suits woodland gardens, forest edges, naturalized borders, and pollinator plantings. Its late flowers provide nectar and pollen for bees, butterflies, hoverflies, and many other beneficial insects when fewer floral resources remain available. It pairs naturally with wild columbine, heartleaf foamflower, woodland phlox, and ostrich fern. This native perennial may self-seed and develop colonies under favourable conditions, so unwanted seedlings can be removed when a more contained planting is preferred. All parts are toxic when ingested and the plant should be kept away from livestock, pets, and young children who may chew vegetation.
Sowing guide
It all startswith a seed.
Sowing depth
Surface sow
Spacing / density
45 to 60 cm (18 to 24 in)
Germination temperature
18 to 22°C
Germination time
14 to 30 days after at least 60 days of stratification
Sowing period
Fall or spring after cold stratification
Propagation
Seed, division, or self-seeding
Cold stratification
Yes
Growing method
Sow White Snakeroot seeds in autumn or spring after cold stratification to improve germination. Surface sow the seeds, as light promotes successful germination. Keep the growing medium evenly moist at 18 to 22°C (64 to 72°F). Germination generally occurs within 14 to 30 days. Transplant seedlings into humus-rich, well-drained soil in light shade or partial shade. Once established, this native perennial often self-seeds naturally and forms attractive colonies in woodland gardens.
Soil and care
The right care,at the right time.
Soil pH
Acidic to neutral
Minimum temperature
Approximately -40°C
Care level
Moderate
Watering
Moderate; keep soil evenly moist
Soil type
Humus-rich, moist, well-drained soil
Fertilization
Light application of mature compost in spring
Moisture
Medium; moist, well-drained soil
Seasonal care
In early spring, remove the previous season’s dry stems before new growth appears, or leave them until the last practical moment to protect overwintering insects. Apply a thin layer of compost or shredded leaves around the plants without covering the crowns. During summer, keep the soil evenly moist and water through extended dry periods. After flowering, retain some seed heads for wildlife and natural reseeding, or remove them to limit spread. Wear gloves when handling the plant, avoid transferring plant material to the mouth, and keep cut stems away from livestock and pets.
Container growing
A garden,within reach.
Recommended pot size
30 cm (12 in)
White Snakeroot grows well in containers at least 30 cm (12 in) deep filled with an organic-rich growing medium. Place the container in light shade or partial shade to mimic its natural woodland habitat. Keep the soil evenly moist without becoming waterlogged and apply organic mulch to reduce evaporation. This native perennial creates an attractive woodland display while drawing a wide diversity of pollinators late in the season.
Bloom and dimensions
Its place,in your garden.
Mature height
120 cm
Width / spread
75 cm per plant
Flower color
White
Foliage color
Dark green
Foliage type
Deciduous
Growth rate
Moderate
Growth habit
Upright, branched, and colony-forming
Fragrance
Bloom period
July to September
Fruiting
Small achenes with white bristles
Days to maturity
May flower in the first or second year
Harvest
September to October
Garden associations
In goodcompany.
Companion plants
Wild columbine, heartleaf foamflower, woodland phlox, ostrich fern
Plants to avoid
Lavender, cotton lavender, rosemary, and stonecrop
Frequently asked questions
Your questions,answered.
When should white snakeroot seeds be sown?
White Snakeroot seeds are best sown in autumn or spring after cold stratification. This treatment significantly improves germination.
Does white snakeroot attract pollinators?
Yes. Its abundant late-summer flowers attract a wide variety of bees, butterflies, hoverflies, and other beneficial pollinators when few other flowers remain.
Can white snakeroot grow in shade?
Yes. White Snakeroot naturally grows in open woodlands and thrives in light shade to partial shade. It also tolerates some direct sun if the soil remains cool and moist.
Is white snakeroot poisonous?
Absolutely. It is highly recommended for ecological gardens, woodland restoration, and naturalized landscapes where supporting biodiversity is a priority.
Is white snakeroot hardy in Quebec?
Yes. White Snakeroot is fully hardy throughout Canada and returns reliably every year, even after harsh winters.
Wildlife and pets
Life,around your plants.
Attracts birds
Yes
Native plant
Yes
Reported toxicity
Yes
Supporting wildlife
Butterflies and bees
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