Horehound
Marrubium cylleneum
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
12 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8, 9
Water
Low to moderate
Humidity
Low
Lifespan
Perennial
Native To
Mediterranean region
Toxicity
Non-toxic
The Story
Plant Bio
Marrubium cylleneum is a hardy perennial herb characterized by its grey-green, wrinkled foliage and small, tubular white flowers that bloom in dense clusters, creating a bushy and aromatic plant presence. This species is valued for its medicinal properties, especially its use in traditional herbal remedies, and exhibits a vigorous growth habit that makes it suitable for ground cover and border planting.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into well-draining soil in early spring.
- Mist cuttings regularly to maintain humidity.
- Ensure full sun exposure for optimal growth.
- Water sparingly once established, about once every two weeks.
- Thin seedlings to prevent overcrowding, after 6 weeks.
- Mulch lightly to retain moisture and suppress weeds.
Pro Tip
Plant in well-drained soil and full sun for best results.
Keep It Thriving
Care Guide
Do
- Water deeply during dry spells 🌱
- Prune lightly after flowering to encourage bushiness
- Apply compost in spring to boost growth
Don't
- Overwatering can cause root rot ❌
- Avoid heavy fertilization which can reduce aromatic qualities
- Do not disturb roots during active growth
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Harvest | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
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?
Not reliably. Deer may browse Horehound, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Horehound bloom?
Horehound typically blooms in early summer through mid-summer. 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 to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
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.
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Grow Horehound with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
