Viper's bugloss benefits: tea, poultices and cautions

Updated on 21 September 2026Published on 27 August 2023

Viper’s bugloss is the bristly, blue-spiked biennial you see colonising road verges, old quarries and dry banks. Herbalists have long taken an interest in its mucilage-rich leaves, its soothing roots and the oil pressed from its seeds. This page sets out what the plant is, what tradition credits it with, how it is prepared at home, and the very real reasons to be careful with it.

Viper’s bugloss at a glance
Item	Detail
Botanical name	Echium vulgare
Family	Boraginaceae
Other names	Viper’s bugloss, blueweed, snake flower
Parts used	Flowering tops, leaves, roots, seeds (for oil)
Forms of use	Infusion, poultice, compress, cosmetic seed oil
Harvest season	Leaves late spring to midsummer; flowering tops early to late summer; roots mid to late autumn
Taste	Mild, slightly slippery and mucilaginous, faintly grassy; the flowers are gently sweet

What it is credited with

Coughs and dry throats: country herbalism treated the flowering tops as an expectorant plant, used to loosen a tight, dry cough and ease chest congestion.
Soothing mucilage: like its borage relatives, it has a reputation among traditional herbalists for coating and calming irritated mucous membranes.
Water balance: old herbals list it among the mildly diuretic plants, taken to encourage the passing of water.
Feverish chills and headaches: in traditional European herbalism the flowering tops were used as a comforting drink during feverish colds, alongside rest and warmth.
Aching joints: folk medicine used compresses of the plant on stiff, painful joints and limbs; naturopathy still mentions this among its traditional external applications.
Skin and small wounds: the roots, rich in mucilage, have a long reputation as an emollient poultice for grazes, chapped skin and boils.
Cosmetic oil: echium seed oil, cold-pressed and sold for skincare, is credited by cosmetic formulators with softening and improving the suppleness of dry skin.

How to use it

Viper’s bugloss is above all an external plant in modern practice. Internally, keep any use short, occasional and very modest — see the cautions below.

Infusion of flowering tops

Use about a teaspoon of dried flowering tops per cup (250 ml) of water.
Pour water just off the boil over them, cover, and leave to steep 8 to 10 minutes.
Strain carefully through a fine sieve or muslin: the hairs are prickly and must not end up in the cup.
One cup in the evening, for two or three days at most during a dry cough, and no longer.
Taste is bland and slightly slippery; a little honey and lemon make it far more pleasant.

Root poultice

Lift roots in mid to late autumn, wash and scrub them well.
Chop finely, or crush to a pulp with a splash of hot water.
Spread between two layers of clean cloth or gauze and lay on the area for 15 to 20 minutes.
Prefer the roots to the leaves here: the bristly leaves can irritate the skin.
Never apply to broken, weeping or infected skin.

Warm compress

Make a strong infusion of flowering tops, let it cool to comfortably warm.
Soak a folded cloth, wring it out, and hold it on stiff, tired limbs for 10 minutes.
Repeat once or twice in the evening; discard leftover liquid rather than keeping it.

Echium seed oil

Buy it ready-pressed, as a cosmetic oil — it is not a home-pressed product.
Two or three drops smoothed into damp skin at night, on the face or on dry patches.
Keep the bottle in the fridge once opened: it is a delicate oil that turns quickly.

Forms of use compared
Form	Part used	Preparation	Traditionally used for
Infusion	Flowering tops	1 tsp per cup, steeped 8–10 min, strained finely	Dry coughs, feverish colds; a mildly diuretic drink
Poultice	Roots	Chopped or crushed, held between two cloths	Chapped skin, grazes, boils
Warm compress	Flowering tops	Strong infusion, cloth soaked and wrung out	Stiff, aching joints and limbs
Cosmetic oil	Seeds	Cold-pressed, bought ready-made	Dry, tight skin; suppleness

Growing it yourself

Full sun, poor and well-drained soil. Limestone, sea spray and drought are no trouble at all.
Waterlogged ground is the one thing it will not accept.
Sow in mid-spring, once hard frosts have passed, burying seed a couple of inches (3–5 cm) deep. Firm, water, keep moist until seedlings show.
Thin to about 12 inches (30 cm) apart when 3 to 4 leaves have formed.
Floral spikes reach 6–12 inches, the whole plant 24–36 inches, giving good height in a dry bed.

How to plant echium vulgare — *Poor, well-drained, sunny ground suits it best*

Watering: a little after planting, then leave it alone. Pots dry out faster and need water twice a month with a dash of liquid fertiliser.
Snip off faded flowers if you would rather not have seedlings everywhere next year — because you will.
In cold regions, grow it in a pot with a drainage layer of clay pellets or gravel at the bottom, so it can be moved under cover.

Caring for echium vulgare — *Thin seedlings to a hand’s width apart for sturdy spikes*

Over winter, move potted plants to a cool, bright spot indoors or under glass.
Outdoors, mulch the soil and wrap young plants in a winter fleece where cold is severe.

Winter care for Viper's bugloss — *Mulch and fleece carry outdoor plants through hard cold*

Cautions

Never consume viper’s bugloss in large amounts. It contains pyrrolizidine alkaloids, which can give the liver a hard time. Any internal use should stay occasional and brief.
Do not use it internally at all if you have any liver condition, or if you drink heavily.
Pregnancy and breastfeeding: avoid entirely, internally and externally.
Children: not for babies, children or teenagers.
If you take any regular medication — particularly anything processed by the liver — speak to a pharmacist or doctor before using this plant in any form.
Avoid alongside other pyrrolizidine-containing plants such as comfrey, borage leaf or coltsfoot.
Handle with gloves: the bristly hairs irritate skin, and leaf poultices can cause a rash. Strain infusions very finely so no hairs remain.
Do not apply to open, weeping or infected wounds. Anything that worsens, or a fever that persists, belongs with a healthcare professional and not with a teapot.
Never harvest from verges, sprayed ground or anywhere you cannot identify the plant with certainty.

Frequently Asked Questions

The one thing to remember: treat viper’s bugloss mainly as an external plant — root poultices, warm compresses and seed oil — and keep any drink from it rare, weak and short-lived.

Which part of viper’s bugloss do I actually use?

The flowering tops make the infusion and the compresses, harvested from early to late summer. The roots, lifted in mid to late autumn, are the traditional poultice material because they are rich in soothing mucilage. The seeds give the cosmetic echium oil, which you buy ready-pressed rather than make at home.

Is it safe to drink viper’s bugloss tea every day?

No. The plant contains pyrrolizidine alkaloids, which are known to be hard on the liver, so it is not a plant for daily or long-term drinking. Traditional use was occasional and short — a cup or two over a few days at most. It is avoided altogether in pregnancy, while breastfeeding, by children, and by anyone with a liver condition or on regular medication.

Why do the leaves irritate my skin?

The stems and leaves are covered in stiff bristly hairs, typical of the borage family. They catch in the skin and can leave it itchy or reddened. Wear gloves when harvesting, use the roots rather than the leaves for poultices, and strain any infusion through muslin or a very fine sieve.

What does it taste like?

Mild and rather bland, with a slightly slippery, mucilaginous texture and a faint grassy note; the flowers are gently sweet. It is not a plant you drink for pleasure. A spoon of honey and a squeeze of lemon make the infusion considerably easier to finish.

Can I grow it just for the bees?

That is arguably its best use. Viper’s bugloss flowers for weeks through summer on dry, poor, sunny ground, needs almost no watering once established, and draws bees and butterflies in numbers. Leave a few spikes to set seed and it will come back on its own.

Images: CC BY 2.0: tsiegretlop, CC BY-SA 2.0: Andreas Rockstein; dreamstime: Nadezhda Andriyakhina; Pixabay: Hans Braxmeier

This information is provided for general interest and reflects the traditional use of plants. It is not a substitute for medical advice. If you are on medication, pregnant, or in any doubt, ask a healthcare professional.