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Medieval herb garden blog 56: Fennel

Thursday, February 05, 2026

Week 56 volunteer update

The ground was still sticky, but we couldn’t leave it any longer. Today we carried out our annual “cull” of the liquorice. Liquorice can send runners out to 20 feet (6 m). So, we have to control it so that it doesn’t take over the garden.

Caroline and Louis tidied around the rhubarb, which is coming on nicely. They also cut back the soapwort. Meanwhile, Carole and Kim tackled the liquorice.

The liquorice runners are not wasted. They are cut and washed and passed on to Kelly, Learning Officer. She will use them on some of her outreach teaching days with local schools.

Four volunteers in green fleeces getting stuck in tidying and weeding in the Medieval Herb Garden

The volunteers hard at work

As the ground was soft, we took the opportunity to remove a couple of the larger bushes that we no longer needed. We moved the green feverfew.

We then transferred the second obelisk into its final position. The hops are already showing growth buds. They were planted to one side of the obelisk.

Hopefully, if the weather gets a bit drier, we will be able to get to grips with the weeding. We will also move plants around that have outgrown their allotted space.

A black metal obelisk (plant support) in the Medieval Herb Garden surrounded by green shrubs

The obelisk standing proud in the Medieval Herb Garden

Plant of the week: Fennel (foeniculum officinale)

'Foeniculum' is the genus name for fennel. This comes from the Latin word 'foenum', meaning hay, because of its hay-like scent. This was corrupted in the Middle Ages into 'Fanculum'. In turn, this led to its alternative popular name 'fenkel'. 'Fennel' came into Old English via 'fenoil', the Old French version of Foeniculum.

Fennel is native to the Mediterranean. It is a hardy, evergreen, perennial herb. It is umbelliferous, which means it is part of the umbellifer plant family.

It prefers to grow in full sun to partial shade, in chalky soil. However, it will grow in any well-drained soil other than heavy clay. Fennel smells similar to aniseed or liquorice.

Fennel can grow up to 7 feet (over 2 metres) tall. It has an erect, hollow, smooth, green stem. The leaves grow up to 16 inches (40 cm) long. They are finely dissected, with the final segments being filiform (threadlike) and very narrow.

Fennel typically flowers between August to October. However, visitors to the Medieval Herb Garden will have seen that ours was still in flower in January!

The flowers are golden-yellow. They are terminal, flat-topped, compound umbels of tiny florets. The florets are 2 to 7 inches (5 to 18 cm) wide. Each umbel section has 20 to 50 tiny yellow flowers on short pedicels.

Fennel has a deep, strong, whiteish taproot. It does not form a base bulb like the Florence fennel, which is used as a vegetable.

Fennel plants in flower, long green stems with clusters of tiny yellow flowers on the end of the stems

Fennel in flower in the Medieval Herb Garden

Culinary uses of fennel

Every part of the plant smells and tastes like aniseed or liquorice. It is often used when cooking fish, to flavour salads and soups, or is chopped into salads. The stems are used to flavour oils and vinegars. The seeds are often dried and sometimes ground. These are used in many different cuisines in both savoury and sweet foods.

Fennel seeds are the main flavour component in Italian sausage. In Spain, the stems of the fennel plant are used in the preparation of pickled aubergines (berenjenas de Almagro).

In many parts of India, fennel seeds are called saunf. Sanuf is consumed raw or roasted as mukhwas. This is an after-meal digestive and breath freshener. They are also candied as a comfit.

Fennel is also an essential ingredient in the Assamese / Bengali / Oriya spice mixture panch phoron, and Chinese five-spice. In China, fennel stem and leaves are often ingredients in the stuffings of jiaozi and baozi. They are also used in cold dishes as a green vegetable.

In Syria and Lebanon, the young leaves are used to make an omelette (along with onions and flour) called ijjeh.

A mid-sized green shrub with lots of fluffy-looking thin leaves growing along green stems

Fennel growing in the Medieval Herb Garden

Use of fennel as a dye plant

Fennel flowers can be used to make a bright yellow dye. Greens can be made by using the leaves and stems. Alternatively, by adding iron to yellow dye baths, you can get mossy or deep pea-green shades. 

Folklore and other facts about fennel

Pliny (77 AD) believed that fennel could be used to treat 22 different ailments. He also observed that serpents eat it “when they cast their old skins, and they sharpen their sight with the juice by rubbing against the plant”.

In Greek mythology, the Titan God Prometheus gave the gift of fire to humans. He carried the fire in a stalk of the poisonous giant fennel plant.

Fennel tea was believed to give courage to warriors before battle. Holy Roman Emperor Charlemagne mandated the growing of fennel on all imperial farms.

The Hittites called fennel the "seeds of desolation" and used it in curses.

In Elizabethan times, fennel symbolized flattery. It featured in Shakespeare's Hamlet.

On Midsummer’s Eve, fennel was hung over doorways and its seeds were inserted into keyholes. This was thought to protect the house and its inhabitants from evil spirits and witches.

Fennel stems have also been used as fly-twitches on horses.

Fennel flowers attract a wide variety of beneficial insects. These including bees (honeybees, bumblebees, solitary bees), wasps (paper wasps, potter wasps, mud daubers), flies (hoverflies, tachinid flies), and butterflies. It is a great pollinator plant.

Fennel also hosts pests like thrips, yellow willow aphids, armyworms and cutworms.

Medieval medicinal uses of fennel*

Fennel has been used for thousands of years to treat a range of conditions. These include abdominal pains, arthritis, cancer and colic in children. It has been used to treat various gastrointestinal issues. Fennel has also been used to treat liver pain, jaundice and kidney stones. Colds, fevers and chest infections have also been treated with fennel.

Fennel was used as a remedy for problems surrounding the menopause and menstruation. It helped to improve milk production in nursing women.

Fennel seeds were chewed to sweeten breath and help a toothache. They were gargled to relieve sore throats.

It was also believed that fennel could help people lose weight.

It was an antidote for poisonous mushrooms and snakebites. A plaster of fennel roots was a traditional treatment for the bites of mad dogs.

*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

Browse all blogs by our dedicated team of volunteer gardeners at Pontefract Castle. Discover a different 'Plant of the Week'.

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