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Marrubium Species, Horehound

Marrubiumcylleneum

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Family

Lamiaceae (lay-mee-AY-see-ee)

Info

Genus

Marrubium (ma-ROO-bee-um)

Info

Species

cylleneum (sy-LEN-ee-um)

Info

Synonym

Marrubium candidissimum

Marrubium velutinum subsp. cylleneum

Sun Exposure

Full Sun

Foliage

Grown for foliage

Herbaceous

Height

24-36 in. (60-90 cm)

Spacing

15-18 in. (38-45 cm)

Hardiness

USDA Zone 4a: to -34.4 °C (-30 °F)

USDA Zone 4b: to -31.6 °C (-25 °F)

USDA Zone 5a: to -28.8 °C (-20 °F)

USDA Zone 5b: to -26.1 °C (-15 °F)

USDA Zone 6a: to -23.3 °C (-10 °F)

USDA Zone 6b: to -20.5 °C (-5 °F)

USDA Zone 7a: to -17.7 °C (0 °F)

USDA Zone 7b: to -14.9 °C (5 °F)

USDA Zone 8a: to -12.2 °C (10 °F)

USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

Danger

N/A

Bloom Color

White/Near White

Bloom Time

Mid Summer

Other Details

Category

Herbs

Water Requirements

Average Water Needs; Water regularly; do not overwater

Foliage Color

Unknown - Tell us

Where to Grow

Unknown - Tell us

Bloom Characteristics

Unknown - Tell us

Bloom Size

Unknown - Tell us

Other details

Unknown - Tell us

Soil pH requirements

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information

Non-patented

Propagation Methods

By dividing the rootball

From herbaceous stem cuttings

Allow cut surface to callous over before planting

From seed; direct sow outdoors in fall

From seed; direct sow after last frost

By simple layering

By serpentine layering

Seed Collecting

Bag seedheads to capture ripening seed

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

Regional

This plant is said to grow outdoors in the following regions:

Fort Payne, Alabama

Amesti, California

Corralitos, California

East Richmond Heights, California

Elkhorn, California

Fairfield, California

Interlaken, California

Mountain Ranch, California

Pajaro, California

Richmond, California

Sun City, California

Watsonville, California

Linthicum Heights, Maryland

Nahant, Massachusetts

Howell, Michigan

Binghamton, New York

Flat Rock, North Carolina

Portland, Oregon

Lampasas, Texas

Cheyenne, Wyoming

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Gardener's Notes:

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