Why Clustered Mountainmint is a Great Choice for Landscapers and Gardeners
The Perennial Plant Association has honored Clustered Mountainmint (Pycnanthemum muticum) as its 2025 Perennial Plant of the Year®, and for good reason. This hearty choice has a strong combination of ecological value, adaptability, and ornamental appeal that makes it a standout for both home gardeners and professional landscapers.
Whether you’re passionate about supporting pollinators, creating a sustainable garden, or simply adding beauty to an outdoor space, Clustered Mountainmint deserves a place in your plans. Let’s look deeper into what makes this plant such a valuable perennial, its unique characteristics, care requirements, and ways to integrate it into garden designs.
What Is Clustered Mountainmint?
Clustered Mountainmint, or Pycnanthemum muticum, grows 2 to 3 feet tall and wide. It grows in dense and bushy mounds, for a thick naturalistic look. Though not a true mint, it features oblong, medium-green leaves that emit a refreshing mint aroma when crushed.
The plant flowers with pale pink to lavender blooms that cluster at the top of the stem, and they have silvery-white bracts that create a shimmering appearance. It’s not overly aggressive like other members of the mint family.
Here are some quick growing facts:
- DR50 plugs (119” cubic volume) plugs are 2.25” wide by 5” deep
- Light: full sun to partial shade
- Size: 24-36” tall (spreads widely by rhizomes)
- Soil: Prefers medium to high moisture, fertile, well-draining soils
- Hardiness: USDA zones 4 to 8
- Wetland Code: FAC
Featured in Grower Talks Magazine
Pizzo Native Plant Nursery was invited to discuss Pycnanthemum muticum more in the fall edition of Grower Talks magazine for October 2024. Check out the article by Lowell Halvorson: Pycnanthe-whom?
Why Clustered Mountainmint Is a Good Choice for 2025 Perennial Plant of the Year
The Perennial Plant Association began the Perennial Plant of the Year program in 1990 to highlight plants that are a standout amongst the competitors. Clustered Mountainmint was chosen for being suitable across a range of growing climates, being low maintenance, and having multiple season interest.
Clustered Mountainmint has the most ornamental value out of the pycnanthemums. The silvery bracts surround the flower, and give the top a cream look and feel. You can read more about the award on the Perennial Plant Association website.
A Long Growing Season
Clustered Mountainmint remains attractive from midsummer into early fall, making it a long-lasting feature in the garden. The green foliage provides a lush backdrop throughout the growing season, and its structural presence persists even as winter approaches.
Why You Should Incorporate Clustered Mountainmint Into Your Plans
Clustered Mountainmint is an excellent choice for those looking to incorporate sustainability and biodiversity into their gardening and landscaping. Here are some reasons you should consider this plant for your next gardening or landscaping project.
- Pollination Benefits—Clustered Mountainmint is attractive for pollinators. Its tiny, nectar-rich flowers are a magnet for bees, butterflies, and beneficial wasps. These pollinators are essential for ecosystem health, aiding in the reproduction of many flowering plants and food crops.
- Visual Appeal All Season—While the flowers are small, the plant’s silvery look surrounding the blooms creates a luminous effect that lasts from midsummer through early fall. This look gives Clustered Mountainmint a dynamic presence in the garden, catching the light and providing texture that complements other plants.
- Resilient and Adaptable—Clustered Mountainmint is remarkably tolerant of varying conditions, flourishing in full sun or partial shade and adapting to both moist and dry soils. It’s also highly drought-tolerant, making it a valuable option for dry landscapes.
- Pest and Herbivore Resistance—If deer or rabbits frequently ravage your garden, Clustered Mountainmint offers a reprieve. Its fragrant, minty foliage acts as a natural deterrent to these animals, while its sturdy growth resists common pests.
- Low Maintenance, High Impact—Clustered Mountainmint is a native perennial that requires minimal care. There’s no need for frequent watering, fertilizing, or pruning, which makes it ideal for growers of all experience levels. Over time, it fills spaces naturally, reducing the need for mulch and suppressing weeds.
Designing with Clustered Mountainmint
Clustered Mountainmint’s versatility makes it suitable for various landscape styles. Here are a few design ideas to inspire its use:
Pollinator Gardens
Clustered Mountainmint is indispensable in pollinator gardens. Its nectar-rich flowers draw bees, butterflies, and even wasps, which help control the garden pests. It pairs well with Purple Coneflower, Milkweed, and Joe-Pye Weed in a pollinator garden.
Naturalized Meadows and Slopes
Clustered Mountainmint is an excellent choice for stabilizing slopes or naturalizing in meadows because of its spreading and erosion control capabilities. It pairs well with native grasses and wildflowers, such as Little Bluestem and Goldenrod in this application.
Residential Gardens
The appeal of Clustered Mountainmint makes it an ideal choice for use in residential gardens. Its dense growth makes it an excellent choice for edging pathways or defining borders. It grows well with plants like Asters and Sedum in this setting.
Container Gardening
Clustered Mountainmint can also be grown in large containers, though this is less common. Its compact growth and silvery appearance make it a unique centerpiece or accent plant for patios and balconies.
Care and Maintenance Tips for Clustered Mountainmint
One of the most appealing traits of Clustered Mountainmint is that it doesn’t require much care relative to other plants. We have some basic care and maintenance suggestions to ensure the plant thrives in your environment.
Planting Tips
You can choose a spot that is either full sun or partial shade. Well-drained soil is ideal, but the plant will also tolerate clay or rocky soil. It’s a good idea to plant in the spring or fall to allow the roots to establish before extreme weather conditions. You’ll also want to allow at least 2-3 feet between the plants to accommodate spread or growth. Use our plant calculator to plan your project.
Watering
Water regularly during the first growing season to establish roots. Once mature, Clustered Mountainmint is highly drought-tolerant and rarely requires supplemental watering.
Fertilizing
This native plant thrives in average soil and doesn’t require heavy feeding. You can apply compost or a balanced organic fertilizer in the spring, but it’s not required.
Pruning and Division
You can either deadhead spent flowers to extend the bloom time or leave them for the winter. Cut back stems in late fall or early spring to tidy up the garden. Divide clumps every few years to control spread and rejuvenate growth.
The Ecological and Environmental Benefits of Clustered Mountainmint
Beyond its beauty, Clustered Mountainmint supports a healthy, sustainable landscape through several different ways.
Attracts Beneficial Insects
In addition to bees and butterflies, Clustered Mountainmint attracts predatory insects such as wasps, which help control garden pests. This reduces the need for chemical interventions.
Erosion Control
The plant’s dense root system stabilizes soil, making it an effective option for slopes or areas prone to erosion.
Low Carbon Footprint
As a native perennial, Clustered Mountainmint requires minimal water, fertilizer, or pesticides.
Wildlife Habitat
The dense foliage provides shelter for insects and small wildlife, adding to the plant’s ecological value.
Why Now Is the Time for Clustered Mountainmint
The selection of Clustered Mountainmint as the 2025 Perennial of the Year underscores a growing shift toward sustainable, ecologically focused gardening with native plants. Landscapers and gardeners are increasingly seeking plants that:
- Require minimal care
- Support biodiversity
- Thrive in a variety of conditions
Clustered Mountainmint embodies all these qualities, making it a perfect plant for modern landscapes.
Companion Plant Recommendations
When you’re looking to create a beautiful landscape or garden area, every plant deserves to have a friend. Here are some plants that pair well with Clustered Mountainmint:
Baptisia alba – Wild White Indigo is a classic prairie herbaceous shrub reaching about 4 feet in height that thrives in dry to mesic soils. Greyish to bluish green foliage is topped by tall white flower spikes beginning in June and lasting up to a month. With a long taproot and great longevity in the landscape, plant this and other indigos where they can remain for decades. Some skippers and butterflies use this as a host plant.
Echinacea pallida – This original woodland edge species brings value to a landscape and is typically found thriving in dry and mesic prairies or a mesic savanna. Pale Purple Coneflower is a known food and nectar source for butterflies. It rises to about 3 feet tall and produces a ray of pale, thin, and drooping light pink to purple petals in the early summer.
Echinacea purpurea – This plant is one of the showier Echinacea species, and branches its inflorescence to bloom multiple ray-like deep pink flowers around the center composite flowers in the summer. Purple Coneflower can reach up to 5 feet tall, and has rough leaves which makes it a wonderful species to sustain drought. It’s a food and nectar source for many butterflies, and its seeds are beloved by goldfinches.
Liatris scariosa var. nieuwlandii – Northern Blazing Star is a lovely prairie plant reaching about two feet tall with flower spikes covered in large clusters of violet florets. It flowers later than others, beginning in August. It’s visited by pollinators of all kinds, and prefers mesic to dry soils. It’s also drought tolerant once established.
Monarda bradburiana – This perennial is found in the central southern midwestern states. It prefers thin, rocky soils, but makes an excellent choice for a home landscape. In the fall, its foliage will develop into a red color, and it is thought to be more mildew resistant than other monardas. It is known to attract many pollinators, including a monarda specific bee (Doufourea monardae).
Rudbeckia fulgida – Showy Black-eyed Susan has large golden yellow daisy-like flowers beginning in June and blooming into fall. It’s an excellent cut flower and a pollinator magnet, and is a larval host for several moths. It prefers prairie situations in moist to mesic soils.
Sporobolus heterolepis – This is one of the most beloved prairies grasses due to its unique characteristics. The dense tufts of leaves stem from a center point and create an image of a fountain as they hang over the circumference of the main stalk. Prairie Dropseed is found in mesic areas and drier areas, and adds a sweet aroma to the air.
Symphyotrichum oolentangiense – Sky Blue Aster is often found on prairies and savannahs, and features light blue daisy flowers with gold centers beginning in August. The basal leaves are heart-shaped on long petioles with smooth edges. Sky Blue Aster thrives in mesic to dry soils. Asters are key pollinator plants that provide a welcome source of late-season nectar. Numerous moths use them as larval hosts.
Buy Your Clustered Mountainmint From a Trusted Nursery
Clustered Mountainmint (Pycnanthemum muticum) is a wonderful perennial for landscapers and gardeners of all skill levels. It offers tremendous environmental benefits and a variety of use cases.
Pizzo Native Plant Nursery is a wholesale grower of Clustered Mountainmint and other native plants that are ideal for various landscapes and gardens. We sell four species in 50-deep liners. They spread easily in Midwestern gardens.
Here’s what you can find with us, and a profile of fragrance:
- P. muticum—Spearmint, sweet mint fragrance.
- P. pilosum—Strong and spicy peppermint; smells like a candy cane.
- P. tenuifolium—Very faint mint scent with a hint of grass.
- P. virginiamum—Lemony, citronella mint scent.
Our trusted team can help you answer any questions you may have about incorporating this plant into your next project. The Pizzo Plant Nursery encompasses 40 acres of restored wetland and prairie habitat in Leland, Illinois. Visit where to buy to learn more about ordering native grass for your project.