Black horehound (Ballota nigra)

Also known as: Stinking horehound

Black horehound, scientifically known as Ballota nigra, is a perennial herb noted for its musty or moldy scent. The genus name "Ballota" is derived from the Greek word that means "to reject," reflecting the plant's unpleasant odor that tends to repel both animals and people.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Black horehound

Lifespan

Perennial

Plant Type

Herb

Plant Height

30 cm to 1 m

Spread

60 cm to 90 cm

Leaf Color

Green

Flower Size

1.3 cm

Flower Color

Purple Pink

Images of Black horehound

Quickly Identify Black horehound

Ballota nigra can be identified by its square stems, soft, hairy leaves, and clusters of small, purple or pinkish flowers. The leaves are toothed and have a distinctive, unpleasant smell.

Scientific Classification of Black horehound

Phylum

Vascular plants

Class

Dicotyledons

Order

Lamiales

Family

Mint

Genus

Horehounds

Species

Black horehound

Planting and Growing of Black horehound

Care Difficulty

Easy

Watering Schedule

Every 3 days

Sunlight Requirements

Partial sun

Sunshine Duration

4-6 hours

Ideal Temperature

60-70℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Ceramic, Plastic

How to Water Black horehound?

Ballota nigra prefers moderate watering, keeping the soil evenly moist but never waterlogged. Water it with about 200 ml, ensuring the top inch of the soil is moist but not soggy. Overwatering can lead to root rot, so it's important to allow the soil to dry out slightly between waterings.

What are the symptoms of an underwatered Black horehound? ›

What should I do if my Black horehound is not getting enough water? ›

What are the symptoms of an overwatered Black horehound? ›

How to save an overwatered Black horehound? ›

What Are the Sunlight Requirements for Black horehound?

Sunlight Requirements: Partial sun

Duration of light: 4-6 hours daily

Ballota nigra benefits from partial sun exposure, ideally four to six hours of diffused sunlight daily. This light range ensures optimal growth and vibrant blooms while preventing potential scorch.

Preferred Environment ›

Benefits of Ideal Lighting ›

Solutions for Ideal Lighting ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Black horehound?

Ideal Temperature: 60 ~ 70℉

The ideal temperature range for cultivating Ballota nigra is between 60°F to 70°F. In this range, the plant can perform optimal photosynthesis, respiration, and nutrient uptake processes, facilitating its growth and development. Maintaining this temperature range assures vigorous growth and blooming.

What Soil is Best for Black horehound?

Soil type: Sandy loam, Loam

Soil PH: 6.5 ~ 7.5

Ballota nigra thrives in soils that offer excellent drainage. This reduces the risk of root rot and other moisture-related issues, allowing the plant to focus on healthy growth and aromatic leaf production. Medium-fertility soil is ideal for Ballota nigra, as it requires nutrients for robust foliage growth but not in excess. A balanced nutrient supply ensures the plant produces its characteristic aroma without becoming leggy or weak. This plant prefers a soil pH ranging from neutral to slightly alkaline (6.5 to 7.5). Maintaining this pH range supports nutrient availability, leading to optimal growth and a healthy plant appearance.

How to Fertilize Black horehound?

Fertilizer type: Balanced

For Ballota nigra, apply liquid fertilizer at half the recommended strength on the package to prevent over-fertilization, as it's a plant that thrives in nutrient-poor soils. Use approximately 100 to 150 ml of diluted liquid fertilizer per application.

How to Prune Black horehound?

Pruning Time: Spring, Summer

Begin by removing any dead or diseased branches by cutting back to a healthy branch or bud. This helps to maintain the overall health of the Ballota nigra. Trim back the longer stems to shape the plant and encourage it to grow densely. This can help maintain your desired appearance for the plant. Deadheading or removing faded flowers can prevent seed formation and promotes prolonged blooming, keeping your plant lively throughout the growing season. More About Pruning Techniques→

How to Propagate Black horehound plant?

Propagate Time: Spring,Late spring,Early spring,Summer

Collect seeds from mature Ballota nigra plants during late summer. Sow them in well-draining soil, lightly covering the seeds, and water gently to settle the soil.

Select healthy stem cuttings about 10-15 cm long. Remove the lower leaves and dip the cut end in rooting hormone to encourage root growth.

Carefully dig up a mature Ballota nigra plant and divide it into smaller sections, ensuring each has roots attached. Replant these divisions promptly in prepared soil.

More About Propagating Techniques→

How to Repot Black horehound plant?

Repotting frequency: Every 2-3 years

Ballota nigra should be repotted when you notice roots starting to grow through the drainage holes or if the plant appears too large for its current pot. Another signal is slowed growth despite normal conditions. Ideal times for repotting are during its active growth periods, particularly in spring and autumn, when the plant can recover more quickly.

Select a pot that is one size larger than the current one to provide room for growth. It should have multiple drainage holes to prevent waterlogging, which can lead to root rot. Using a slightly larger pot helps promote balanced root development, preventing the plant from becoming root-bound.

Use well-draining, sandy loam as it provides good aeration while retaining essential nutrients for Ballota nigra. This type of soil prevents water stagnation, reducing the risk of root disease, and supports healthy root growth by allowing excess moisture to escape.