Marianne CannonHow to grow and use licorice

Today I’m talking with herb specialist Ian Hemphill of Herbies Spices about growing that very tasty plant, licorice (or liquorice if you are in the UK). Forget the sticky black confectionary licorice – you can make your own sweet treats like licorice icecream and even chewable sticks from your own home-grown plant.

Licorice is a fascinating plant with a long history as Ian describes!

Glycyrrhiza glabra flower Photo Paroah han

Glycyrrhiza glabra flower Photo Paroah han

Licorice comes made from the root of Glycyrrhiza glabra, a small perennial plant in the pea family (Fabaceae) that grows to about 1m (3ft) tall and wide. Its natural habitat is south-east Europe through to north-west Asia. It was brought into Western Europe by returning Crusaders in the 12 century and has since been widely grown throughout Europe and the UK.

Licorice has pretty, light-green foliage and small heads of bluish-grey pea flowers in summer and prefers to grow in full sun in deep, sandy slightly alkaline soil that is both moist but well-drained. A deep, alluvial sandy soil encourages the formation of long taproots and a wide root zone so there’s more to harvest. Plants like plenty of heat, which increases their sweetness, and will grow in mediterranean through to tropical climates as long as the roots don’t stay too wet. (USDA Zones 7-10). They will also tolerate frosts as they die down in winter.

It takes about 3 years for the plant to develop enough thick, fleshy roots to harvest but don’t leave it longer than that as the roots become woody and less palatable.

You can grow licorice from seed (soak them first) or by cutting off a new plant forming at the end of a sucker (stolon), which are stems that spread along the ground, or by root division.

How to use licorice:
Dig up the roots as the plant dies back in autumn/fall but keep some of the smaller, newer roots for replanting for your next crop. Wash and then cut the harvested roots into small chips and either leave to air dry and then store in an airtight container, or add water and boil them down to make a thick, molasses-like extract. This can then be used in Chinese and other Asian cooking and for flavouring icecream (although the icecream will be an unappealing grey colour!), as a refreshing tea hot or cold. Pontefract cake is made from pouring the extract into small lozenge-sized molds.

Packaged licorice chips imported from Spain. Photo Chameleon

Packaged licorice chips imported from Spain. Photo Chameleon

The small chips, which look like tiny wood chips, can also be chewed raw. Licorice is 50 times sweeter than sugar although the sweetness is released more slowly and is not as intense as sugar.

Licorice extract is used in a huge range of manufactured food and drink, such as Guinness beer, chewing gum and baked goods, as well as being used in cigarettes, cough syrups and pill manufacture. However often the candy sold as licorice is actually flavoured with star anise which has a similar flavour.

[Note – don’t confuse true licorice/liquorice with other plants with common names like ‘licorice plant’, which is Helichrysum petiolare. However there is a form of wild licorice native to America – Glycyrrhiza lepidota which has a similar but less intense flavour]

Where to buy licorice/liquorice plants:
Australia – Mudbrick Cottage Herb Farm (small plants); All Rare Herbs (seed)
UK – Brandy Carr Nurseries (plants and seed); Suttons Seeds
USA – Strictly Medicinal Seeds
New Zealand – Kings Seeds

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Marianne Cannon

About Marianne Cannon

Marianne Cannon has been broadcasting as Real World Gardener on radio 2RRR 88.5fm in Sydney, since September 2009, and the program is now syndicated to radio stations around Australia. It's about growing your own, the abc of plants, and how to create sustainable gardens to fit into today's environment. Not just a show about plants; it has a strong green and ecological bent, with co-presenters addressing issues such as native animals and plants, water conservation, composting, reducing waste, protecting native species and more.

4 thoughts on “How to grow and use licorice

  1. Thank you for the information. I grow liquorice in pots. Going on what I’ve just read one is ready to harvest. Did wonder about how to preserve the root once taken. Timely info for me 🙂

  2. Hello Jackie,

    well done on growing licorice successfully.
    If you cut up the roots reasonably small, then air dry them or in one of those food dryer devices, you can then store them in an airtight container for a few months.
    The other suggestion is to add water and supposedly ( I haven’t tried this) you can boil them down to a thick molasses which will store almost indefinitely.


  3. Hello
    Licorice will raise your blood pressure which is good news for people like me who suffer from low blood pressure. It contains glycyrrhizinc acid which is not found in other foods … This is what helps reduce the symptoms of low blood pressure. I reach for it when I feel weak in the legs or dizzy. I’m going to try and grow some. Thank you for your information. Katie

  4. I love liquorice root and will be growing a plant as soon as I’m able to source one – they seem to be out of stock at present. Do you know anything regarding consuming it for long periods? I recall reading somewhere that you should take a rest from it after a few months, I think, but wasn’t sure if that’s correct or not. The article mentioned something about the liver, but I can’t locate it. Cheers

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