perennial

Thin-leaved Mountain Mint

Pycnanthemum tenuifolium

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Essentials

At a Glance

Plant Type

Perennial

Height

30 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Eastern North America

Toxicity

Non-toxic

The Story

Plant Bio

Pycnanthemum tenuifolium is a perennial herbaceous plant known for its slender, aromatic foliage and clusters of small, white to pale purple flowers that attract pollinators and form dense, upright clusters. This species is valued for its strong scent, drought tolerance, and ability to attract beneficial insects, making it an excellent choice for naturalistic gardens and pollinator-friendly landscapes.

Bloom Period:

EarlyLate

Uses & Benefits:

Provides fragrant, white flowers that attract pollinators, enhancing garden biodiversity.

Drought tolerant and low-maintenance, ideal for water-wise gardens.

Supports native pollinators and beneficial insects.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck seeds into well-draining soil in spring
Water regularly until established, about 6 weeks
Place in full sun for best flowering
Thin seedlings to prevent overcrowding
Mulch lightly to retain moisture
Divide every 3-4 years in early spring

Pro Tip

Ensure excellent drainage to prevent root rot.

Keep It Thriving

Care Guide

Do

Water during dry periods 🌱
Prune after flowering to maintain shape
Mulch to conserve moisture

Don't

Overwater or let sit in water ❌
Apply heavy fertilizer late in season ❌
Neglect pruning, which encourages woody growth ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Harvest
Pinch

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildflower garden with aromatic scentPollinator-friendly borderDrought-tolerant herbaceous bed

Companion Plants

Echinacea Rudbeckia Salvia Sedum Coreopsis

Multiply

Propagation Methods

Good to Know

Common Questions

Thin-leaved Mountain Mint questions

What zones can Thin-leaved Mountain Mint grow in?

Thin-leaved Mountain Mint is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Thin-leaved Mountain Mint deer resistant?

Yes — Thin-leaved Mountain Mint is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Thin-leaved Mountain Mint bloom?

Thin-leaved Mountain Mint typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Thin-leaved Mountain Mint need full sun?

Thin-leaved Mountain Mint does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Thin-leaved Mountain Mint drought tolerant?

Yes — once established (usually after the first full season), Thin-leaved Mountain Mint handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.