Hoary mullein (Verbascum pulverulentum)

Also known as: Violetstamen mullein

Hoary mullein, originating from the British Isles and western Europe, typically blooms in summer. Its flowers are most often bright yellow, but can also appear in orange, red-brown, purple, blue, or white. Due to their striking appearance, several cultivars of hoary mullein have been honored with the Royal Horticultural Society's Award of Garden Merit.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Hoary mullein

Lifespan

Biennial

Plant Type

Herb

Plant Height

50 cm to 2 m

Spread

30 cm to 60 cm

Leaf Color

Gray-green

Flower Size

2 cm to 2.5 cm

Flower Color

Yellow Purple Gold

Images of Hoary mullein

Quickly Identify Hoary mullein

Verbascum pulverulentum can be identified by its dense rosette of pale, woolly leaves, which can reach a length of up to 30 cm. The tall flowering stem, which can grow to over 1.5 meters, bears numerous yellow flowers each about 1.5-2 cm in diameter. The plant is covered in fine white hairs, giving it a \'hoary\' appearance.

Scientific Classification of Hoary mullein

Phylum

Vascular plants

Class

Dicotyledons

Order

Lamiales

Family

Figwort

Genus

Mullein

Species

Hoary mullein

Planting and Growing of Hoary mullein

Care Difficulty

Easy

Watering Schedule

Every day

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

65-75℉

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

Plastic, Ceramic

How to Water Hoary mullein?

The watering amount for Verbascum pulverulentum is guided by its preference for well-drained soil. A thorough soak of about 500ml should be provided, ensuring the water percolates through and the excess drains away, mimicking their native dry habitats.

What are the symptoms of an underwatered Hoary mullein? ›

What should I do if my Hoary mullein is not getting enough water? ›

What are the symptoms of an overwatered Hoary mullein? ›

How to save an overwatered Hoary mullein? ›

What Are the Sunlight Requirements for Hoary mullein?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6-8 hours sunlight

Ideally, Verbascum pulverulentum thrives in full sun to partial sun conditions. This optimal range supports robust growth, vibrant foliage, and abundant blooming, optimizing photosynthesis and energy storage processes crucial for plant health.

How much sunlight does Verbascum pulverulentum ideally need daily? ›

What can be done to optimize light conditions for this plant? ›

What benefits do optimal lighting conditions bring to this plant? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Hoary mullein?

Ideal Temperature: 65 ~ 75℉

The ideal temperature range for Verbascum pulverulentum is between 65°F and 75°F. This range supports optimal growth and encourages healthy blooming. Maintaining this temperature aids in the plant's metabolic activities and ensures proper cellular function, contributing to its robust foliage development and vibrant flowers.

What Soil is Best for Hoary mullein?

Soil type: Sandy soil, Calcareous soil

Soil PH: 6.5 ~ 7.5

Verbascum pulverulentum thrives in well-drained soil, which prevents waterlogging. This type of soil structure allows roots to breathe, reducing the risk of root rot and promoting healthier plant growth. Verbascum pulverulentum can tolerate nutrient-poor conditions, a benefit which allows it to flourish in less fertile locations. Such adaptability makes it resilient and easier to grow without frequent fertilization. This plant prefers dry soils, benefiting from minimal watering. It can sustain growth in arid conditions, making it ideal for xeriscaping and regions with water limitations.

How to Fertilize Hoary mullein?

Fertilizer type: Balanced

Verbascum pulverulentum requires moderate fertilization. Use a balanced liquid fertilizer diluted to half-strength. Apply approximately 100-150 ml for potted plants every two weeks. For garden plants, apply around 250-300 ml to the soil around the base.

How to Prune Hoary mullein?

Pruning Time: Spring, Summer

Begin by identifying the spent flower spikes, which can be recognized by their dried and discolored appearance. Cut these back to the base to encourage the growth of new, healthier spikes. Carefully cut away any stems that show signs of disease or have died back. This not only tidies up the plant but also opens up space for better air circulation, reducing the risk of fungal infections. To maintain a desirable shape, gently trim around the plant, focusing on achieving a balanced and attractive form. This includes cutting back overly long stems to create a more compact appearance. More About Pruning Techniques→

How to Propagate Hoary mullein plant?

Propagate Time: Spring,Late spring

To propagate Verbascum pulverulentum, begin by sowing seeds thinly on the surface of damp seed compost. Do not cover the seeds with soil as they require light for germination. Press them lightly into the soil to ensure good seed-to-soil contact.

Place the seed tray in a warm environment with plenty of natural light. An ideal temperature range for germination is between 65°F and 75°F (18°C and 24°C). Maintain high humidity by covering the tray with a plastic cover.

Once the seedlings have grown sufficiently and have developed true leaves, transplant them into individual pots. Handle the seedlings delicately to avoid damaging their tender roots.

More About Propagating Techniques→

How to Repot Hoary mullein plant?

Repotting frequency: Every 2-3 years

Verbascum pulverulentum typically signals its need for repotting when you notice roots growing out of the drainage holes, or when the growth seems stunted despite adequate care. These are signs that it may be root-bound or depleted of nutrients. It's best to consider repotting during its active growth period in spring or summer to minimize transplant shock and facilitate recovery.

Select a pot that is slightly larger than the current one, offering more space for root expansion without overwhelming the plant with excess moisture. Ensure the pot has good drainage holes to prevent waterlogging, which is crucial for Verbascum pulverulentum. A lightweight, breathable material, like terracotta or ceramic, is ideal for promoting healthy root aeration.

Opt for a well-draining sandy soil mix with added organic matter to ensure both moisture retention and excellent drainage. Such soil prevents root rot while providing essential nutrients. The sandy composition mimics its natural habitat, enhancing robust growth and flowering capability in potted environments.

Toxicity of Hoary mullein

Is Hoary mullein toxic to humans?

The hoary mullein exhibits a low degree of toxicity in humans, primarily resulting from the consumption of its seeds. These seeds are known to contain rotenoids and saponins, compounds that can disrupt various biological processes and potentially lead to negative health effects. Upon ingestion, these substances may cause symptoms such as gastrointestinal distress, nausea, vomiting, and diarrhea. The intensity of these symptoms can differ based on the quantity consumed; however, due to the relatively mild toxicity of the plant, these symptoms are generally not life-threatening. It is crucial for individuals to take precautions to prevent accidental ingestion of hoary mullein seeds, particularly since other parts of the plant do not possess the same toxic characteristics.

Is Hoary mullein toxic to cat?

Hoary mullein is a hazardous plant recognized for its potential danger to cats upon consumption. Cats are at risk of poisoning mainly when they inadvertently ingest certain parts of the plant, particularly the seeds. The harmful substances found in hoary mullein comprise rotenoids and saponins, which may result in severe health issues. Following the consumption of hoary mullein, affected felines might display clinical signs that reflect physical discomfort, illness, or distress. It is essential for cat owners to supervise their pets and prevent them from accessing the toxic components of this plant. If ingestion is suspected, prompt veterinary attention is vital to address the poisoning effects and administer appropriate treatment.

Is Hoary mullein toxic to dog?

Hoary mullein is regarded as toxic to dogs. Canines may inadvertently consume this plant, which creates a risk of poisoning. The primary means by which dogs become poisoned is through the ingestion of the plant's seeds, which they might accidentally eat. Following the intake of hoary mullein parts, dogs can display a range of symptoms that indicate poisoning. These symptoms might encompass gastrointestinal distress, fatigue, breathing difficulties, or other signs of discomfort. It is crucial for dog owners to remain vigilant and keep their pets away from areas where hoary mullein is present, particularly during its seeding period. If a dog is suspected of being poisoned by hoary mullein, it is vital to obtain immediate veterinary assistance to ensure the best possible outcome for the animal.

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.

More About Toxic Techniques→