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Medieval herb garden blog 60: Horehound

Thursday, March 05, 2026

Week 60 volunteer update

Spring has finally arrived at the Medieval Herb Garden, if only for a day!

The daffodils, anemones, primroses and violets were all looking their best.

Daffodils growing at Pontefract Castle

Daffodils in the Medieval Herb Garden at Pontefract Castle

 

Small violet flowers surrounded by oval leaves

Violets growing in the Medieval Herb Garden

We checked on the rhubarb we divided last week. We then weeded and prepared the ground. We got it ready to swap the horehound with the marjoram and move the wild strawberries. The horehound needed to be moved because it had outgrown its allotted space. The wild strawberries needed saving as they were being buried by neighbouring plants!

After a quick tea break, Kim and Carole then cut-back the nightshade and woodsage. They tidied up the white comfrey and continued to weed.

Plant of the week: Horehound (white) (marrubium vulgare)

The common name 'horehound' comes from the Old English 'hoar'. Meaning 'hoary', it relates to the white-woolly, greyish-green appearance of the leaves and stems. 'Hound' comes from the Old English 'hūne', which referred to a downy or aromatic plant.

Marrubium vulgare takes its botanical name from the Hebrew word 'marrob' (bitter juice) and Latin 'vulgare' (common).

Horehound originated in the region between the Mediterranean Sea and Central Asia. Despite this, it is now viewed as a native plant in Britain.

It is a hardy, clump-forming, bushy, aromatic, deciduous plant. It will grow in any well-drained, south or west-facing position, in full sun. Horehound grows in any soil type but clay. It actually thrives in poor soils and can tolerate drought.

Horehound grows to a height and spread of 3 ft (90 cm). It has square-shaped stems with coarse, opposite leaves. The leaves are woolly white below and pale green and downy above. They are up to 1 inch (2.5 cm) long with serrated edges.

Horehound flowers from June to September. It produces hundreds of small, whitish, tubular flowers. These are densely clustered in axillary whorls.

After flowering, the calyx develops into a small, burr-like structure with hooked spines. These contain tiny, round seeds.

Horehound's fragrance has been said to be a “strong, and somewhat pungent, musky aroma, often described as a mixture of camphor, bitter herbs, and occasionally apple”.

Tall pale green horehound plants with thick stems, leaves around the stems and flower buds at the top

Horehound growing in the Medieval Herb Garden

Culinary uses of horehound

Horehound leaves can be used in salads, seafood and other dishes. They add a “subtle minty and slightly bitter flavour”. While it’s not a common ingredient, it can add a herbal hint to sauces, marinades, and herbal infusions.

The leaves and flowers of white horehound can be used to flavour sweets, syrups, and drinks. They are used in horehound beer and herbal teas.

'Horehound candy' is often used to soothe sore throats. It is known for its bittersweet flavour.

Use of horehound as a dye plant

Historically, horehound has been used to create a yellowish-green dye. This was used in textiles.

Folklore and other facts about horehound

Horehound was used by Egyptian priests. It was a sacred remedy for respiratory, digestive, and venom-related ailments. Ancient Egyptian mythology referred to it as the 'seed of Horus'.

Horehound was seen as a magical herb. It was believed to have powers of exorcism, healing and protection. It was often used in protective amulets and charms. It was thought to have the ability to ward off evil spirits and protect against witchcraft.

Horehound was believed to have the power to keep away wild animals and dogs. It was often sprinkled around the outside of a home for protection.

It was thought to be a remedy against cankerworm in trees.

Horehound was introduced to southern Australia in the 1800s as a medicinal herb. However, it has since been declared a "noxious weed".

Horehound is very attractive to many pollinators. These include honey, solitary and bumble bees. However, it can also be visited by spider mites, scale insects, fungus gnats and fruit flies, mealybugs, aphids and whiteflies.

In New Zealand, efforts are being made to control the spread of horehound. Biocontrol measures are being used such as the horehound clearwing moth (Chamaesphecia mysiniformis) and the horehound plume moth (Wheeleria spilodactylus).

Medieval medicinal uses of horehound*

White horehound was mentioned as a remedy for respiratory problems in ancient Rome. Roman encyclopaedist Aulus Cornelis Celsus wrote about it in 'De Medicina', in the first century.

In 1658 Nicholas Culpepper stated, “The leaves used with honey, purge foul ulcers, stay running and creeping sores, and the growing of the flesh over the nails. The juice, with wine and honey, helps to clear the eyesight, and snuffed up the nostrils, it urges away the yellow jaundice; and, with oil of roses, dropped into the ears, eases the pains of them.”

It was used as an anti-poison. It was used to heal thorn-scratches and the bites of 'serpents' and dogs.

Taken in large doses, horehound acted as a gentle purgative. Taken as a tea, it was used to treat eczema and shingles.

*As always, this isn't to be considered medical advice today. Please don't use any plants mentioned in these blogs as medicine without advice from a doctor.

Medieval herb garden blogs

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