When does Hoary mountainmint bloom?

Hoary mountainmint blooms from July through September, producing dense clusters of small white to pale lavender flowers with purple spotting.

What pollinators does Hoary mountainmint attract?

Its summer flowers draw native bees, wasps, butterflies, and beetles, making it a useful nectar plant during its July to September bloom period.

What growing conditions suit Hoary mountainmint best?

It does well in part sun with low water needs, tolerating dry, rocky, or sandy soils in open fields and woodland edges.

Is Hoary mountainmint deciduous or evergreen?

It is an herbaceous forb that dies back to the ground each winter and is classified as deciduous, resprouting from its base each spring.

Hoary mountainmint

Name: Pollinator Patch
Author: Pollinator Patch

Pycnanthemum incanum

Last reviewed: September 2026

Hoary mountainmint is a summer-blooming forb that flowers from July through September in part sun with low water needs. It suits dry, open sites such as fields, woodland edges, and rocky slopes across the eastern and southeastern United States.

Toxicity unknown

Hoary mountainmint (Pycnanthemum incanum) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

part sun

Water

low

Size

24"–48" H × 24"–36" W

Bloom

Jul, Aug, Sep

Native to

AL, CT, DC, FL and 15 more states

Pollinators

native bees, wasps, butterflies, beetles

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Browse plants for this ecoregion

Piedmont Northeastern Highlands Northeastern Coastal Zone Northern Allegheny Plateau Erie Drift Plain Northern Forests Middle Atlantic Coastal Plain Northern Piedmont Southeastern Plains Blue Ridge Ridge and Valley Eastern Temperate Forests Central Appalachians Western Allegheny Plateau Interior Plateau Atlantic Coastal Pine Barrens

An aromatic upright plant whose upper leaves turn silvery white as if dusted, surrounding small clustered pale flowers spotted with purple. Crushed foliage is strongly minty. It tolerates dry shade and poor soil.

Growing Hoary mountainmint

Grow Hoary mountainmint in part sun and low water. Mature plants reach 24 to 48 inches tall and spread 24 to 36 inches wide.

How to care for Hoary mountainmint, by region

How to care for Hoary mountainmint where it is actually grown: year-round basics plus what to do each season, region by region, with the sources for each.

Care guidance last updated: October 2026

Ridge and Valley (includes Harrisburg, PA)

Year-round

Hoary mountain mint is a tough, low-care perennial that can spread.

Give it full sun to partial shade.
It tolerates dry soil but needs good drainage.
Expect 3 to 6 feet tall and 2 to 4 feet wide.

Give it room or cut back self-seeded spreaders so it stays tidy and HOA-friendly.

Fall

Fall brings seed heads.

Seed heads show in September and October.
Cut them back if you want fewer seedlings.
Leave some standing if you like the look.

Winter

Winter needs nothing.

It is hardy in zones 4 to 8, so Harrisburg is fine.
Cut stems back in late winter.
No special protection needed.

Spring

Spring is for giving it room.

Pull or move any seedlings you do not want.
Water new plants during dry spells.
Make space for the full size.

Summer

Summer is bloom time.

Flowers show from June through August.
Water newly planted ones in dry weather.
Established plants handle dry soil.

Sources: NC State Extension Plant Toolbox: Pycnanthemum incanum

Wildlife value

Among the highest-value late-summer nectar plants for total pollinator diversity, drawing dozens of bee, wasp and butterfly species at once.

Common questions

When does Hoary mountainmint bloom?: Hoary mountainmint blooms from July through September, producing dense clusters of small white to pale lavender flowers with purple spotting.
What pollinators does Hoary mountainmint attract?: Its summer flowers draw native bees, wasps, butterflies, and beetles, making it a useful nectar plant during its July to September bloom period.
What growing conditions suit Hoary mountainmint best?: It does well in part sun with low water needs, tolerating dry, rocky, or sandy soils in open fields and woodland edges.
Is Hoary mountainmint deciduous or evergreen?: It is an herbaceous forb that dies back to the ground each winter and is classified as deciduous, resprouting from its base each spring.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

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