Clustered Mountain-mint
Pycnanthemum pilosum
Last reviewed: August 2026
Pycnanthemum pilosum, or clustered mountain-mint, is a full-sun forb that blooms from June through September and draws bees, butterflies, wasps, and moths to its clustered white flowers.
Toxicity unknown
Clustered Mountain-mint (Pycnanthemum pilosum) 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
full sun
Water
medium
Size
12"–36" H × 12"–24" W
Bloom
Jun, Jul, Aug, Sep
Native to
AL, AR, CT, GA and 11 more states
Pollinators
bees, butterflies, wasps, moths
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.
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Clustered mountain-mint is a native perennial herb that produces dense clusters of small white flowers from summer into early fall. The aromatic foliage releases a pleasant minty fragrance when brushed against, and the plant forms neat clumps that work well in sunny garden beds.
Growing Clustered Mountain-mint
Grow Clustered Mountain-mint in full sun and medium water. Mature plants reach 12 to 36 inches tall and spread 12 to 24 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Clustered Mountain-mint is an HOA-friendly choice. Maintenance level: low. Tidiness: 3 out of 5.
Works well in: mid zone, foundation.
- May spread by underground stems if not managed
- Can look sparse in winter when dormant
Wildlife value
This plant is exceptionally valuable for pollinators, attracting numerous species of bees, butterflies, beneficial wasps, and moths throughout its long blooming period. The dense flower clusters provide abundant nectar and pollen sources during peak summer months.
Common questions
- When does clustered mountain-mint bloom?
- Clustered mountain-mint typically flowers from June into September, with dense terminal clusters of small white blooms opening over several weeks in mid to late summer.
- What pollinators visit clustered mountain-mint?
- The flowers attract a wide range of bees, butterflies, wasps, and moths, making it a strong nectar source for pollinator gardens during summer.
- How much water does this plant need?
- It grows best with medium moisture but tolerates drier soil once established, so occasional dry spells are not usually a problem in a sunny garden bed.
- What growing conditions suit clustered mountain-mint best?
- It prefers full sun to part sun and average to medium moisture, growing well in open meadows, prairie plantings, and mixed perennial borders.
- Is Clustered Mountain-mint HOA-friendly?
- Clustered Mountain-mint is generally an HOA-friendly choice in the right placement, with low maintenance.
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
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Clustered Mountain-mint? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Planning a bed around it? Start a free plan with this plant
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