perennial

Horehound

The Story

Plant Bio

Marrubium vulgare, commonly known as horehound, is an erect, multi-stemmed perennial subshrub native to Europe, Asia, and North Africa, reaching one to two feet in height. The crinkled, grey-green leaves are covered in dense, white-woolly hairs and emit a bitter, musky aroma when bruised.

This species is distinguished by its dense, whorled clusters of small white flowers that emerge in the upper leaf axils, each supported by a calyx with ten stiff, hooked spines. The woolly foliage and bitter compounds protect the plant from grazing herbivores while attracting a diverse array of native bees and beneficial pollinators.

Uses & Benefits:

Provides distinct textural contrast in dry gardens with its crinkled, silvery-grey woolly foliage.

Functions as an effective soil stabilizer on dry, degraded slopes where other plants fail to establish.

Attracts a wide variety of native bees, honeybees, and beneficial insect pollinators to its nectar-rich flowers.

Essentials

At a Glance

Plant Type

Perennial

Height

24"

Width

24"

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low

Humidity

Moderate

Lifespan

Perennial

Native To

Europe, Asia, North Africa

Toxicity

Non-toxic

Bloom period

Summer – Autumn

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun with poor, sandy, or stony soil that drains rapidly.
Sow seeds directly in spring, or transplant container-grown starts at the same depth they were in the nursery pot.
Water sparingly after planting only until established, then cease regular irrigation.
Prune the entire plant back to the ground in late winter to stimulate fresh, compact foliage.

Pro Tip

Cut the stems back hard to the basal crown in late winter or early spring; trimming into old, leafless wood prevents proper re-sprouting and leaves permanent dead stubs.

Keep It Thriving

Care Guide

Do

Grow in poor, dry, or degraded soils to maintain a compact, aromatic habit.
Prune hard annually to prevent the plant from becoming woody and sprawling.
Deadhead spent flower spikes before seeds mature to prevent unwanted self-sowing.

Don't

Do not plant in rich, heavily irrigated garden beds, which causes root rot and weak growth.
Do not fertilize, as excess nutrients diminish the concentration of aromatic oils.
Do not cut back into old, leafless wood when pruning.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Pest Check
Plant
Propagate
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rock gardensGravel gardensDry bordersErosion control

Companion Plants

Salvia officinalis Lavandula angustifolia Achillea millefolium

Multiply

Propagation Methods

Good to Know

Common Questions

Horehound questions

What zones can Horehound grow in?

Horehound is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Horehound deer resistant?

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

When does Horehound bloom?

Horehound typically blooms in summer through autumn. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Horehound need full sun?

Horehound does best in full sun (6+ hours).

Is Horehound drought tolerant?

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