A guide to foraging ground ivy (Glechoma hederaceae) – Lamiaceae
Savoury mint aromatics and the number one remedy to soothe away nettles stings.
Ground ivy is such a beautiful and useful herb, far too often overlooked. Even with its gorgeous flowers, remarkable powers and intriguing scent, this plant produces mixed feelings from gardeners, as it’s habit is to take over where it’s not wanted.
Although only a small wee thing, it makes a big impression on the eye when in flower. During the spring you can find large patches of land adorned with splashes of blue-purple, often lower than the tops of the grasses it finds itself in.
By learning the key identifying characteristics of this plant, you will also find yourself with the keys to identifying unknown mint family relatives when you meet them in the wild, or out in zones 00-5.
Ground ivy botanical description
Glechoma hederaceae is a perennial plant, and another useful member of the large and mostly aromatic mint family.
When identifying the mint family plants, you will soon find that the key plant family patterns to look out for are: an aromatic plant with square stems, opposite pairs of simple leaves, five pointed calyx, and two lipped flowers, which often have long corolla tubes.
Ground ivy’s stems are covered in fine bristly hairs. The kidney-shaped, deep green leaves are typically scalloped, or crenated, and slightly undulating at the margins, with essential oil glands on the undersides. The leaves are borne on long petioles.
The upper leaf surface has a covering of very small downy-bristly hairs. The leaves can often be a slight purple hue, depending on soil, site, and time of year. Ground ivy can be found in all but the harshest winters.
It comes into flower around early spring. The main flowering season is late March or April until May. As with all its relatives, these distinctive, almost orchid-like flowers have a two-lipped corolla. On ground ivy, you will usually see two or three flowers appearing from the leaf axil. The corolla tubes are quite long (approx 10-12mm), with nectar at the base. These flowers are great wildlife attractants.
At a glance, this plant could superficially be mistaken for purple dead nettle (Lamium purpureum) and henbit dead nettle (Lamium amplexicaule). Both those plants are related and edible. Touching, engaging, and smelling are, as ever, vital in helping you distinguish between species.
Only when ground ivy is in flower will it be found growing upright and erect. Even in flower I don’t often see ground ivy flowering much above 8-10 inches high, except in the longest of vegetation.
It’s trailing habit comes from the nature of quickly spreading runners’ (horizontally growing stems, just above the soil surface that can produce roots and shoots from every node). This adaptation makes ground ivy an exceptional coloniser of bare soil and darker, shady areas of the garden.
A similar method of growth is employed by mints (Mentha) but their stems are found just under the soil surface, carrying the same capacity to root and shoot at every node.
Habitats to look in when foraging for ground ivy
This plant can be found in a number of settings up and down the land. You might find this distribution map from the online flora of Britain and Ireland helpful, to aid your searching.
Ground ivy loves field edges, hedgerows, woodlands and grassy banks, especially the shadier ones. It is not particularly fussy about soils so has been found in more than 85% of the UK, aside from the extreme North and North West of Scotland.
Parts used – Leaves and flowering tops.
Harvest – Just before flowering is best, though leaves and flowers can be taken for medicinal or culinary use at any time.
Key constituents – Amino-acids, flavonol glycosides (including rutin, isoquercitrin). Flavone glycosides (inc luteolin), Sitosterol, saponin, tannin, wax, volatile oil (inc linalool, limonene, menthone, terpineol, alpha-pinene, pulegone, rosmarinic acid.
Actions – mild expectorant, anti-catarrhal, vulnerary, diuretic, astringent.
Traditional uses – Many herbal authors of old, such as Gerard (circa 1597), noted its use and action on the mucus membranes, thus employing the plant as an expectorant and a cure for colds. Ground ivy’s aromatics really remind me of sage or thyme and mint. I love the scent, but they’re not everyone’s cup of tea.
Its chemistry has been quite extensively documented. The essential oil plays a majar part in ground ivy’s therapeutic ability. The astringent activity is reportedly due to rosmarinic acid, whilst terpineol is known to be antiseptic. Astringency and anti-inflammatory actions of ground ivy are usually associated with the tannins and flavonoid fractions.
Pulegone is the abortifacient agent responsible for the actions of Pennyroyal (Mentha pulegium) where it is found at concentrations of 1-2%. However, it is not present in this plant in high enough concentrations (0.03-0.06%) to be considered harmful.
The terpene-rich volatile oil of this plant indicates it will be an irritant to the mucous membranes of the stomach as well as other parts of the gastro-intestinal tract and kidneys. Irritation is not necessarily harmful because the C.N.S is kick-started into producing responses we desire from it.
More detailed information about medicinal plant constituents and their actions will be found in a previous article here.
Without question this plant is the best antidote I know of for nettle stings. Simply crush and squeeze the leaves and rub the expressed juice on the afflicted area. I have a hunch that its the thicker essential oil components partly responsible for soothing the reaction to the nettle stings. Read more on nettles, stings and medicinal use of urtication in this article on foraging nettles.
As a food, ground ivy makes a good addition to pies, soups or broth. Stuffing mixes and wild salsa verde are enhanced with ground ivy. Flowers can be added to salads for sublime splashes of colour. The somewhat bitter leaves can be used in salads, but I think they need finely chopping before mixing in, because of their strong flavour.
This plant would have been especially welcome to our ancestors, more so in the late-winter-to-early spring period, when fresh new leaves are scarce. Its leaves cook down like spinach and the volatile oil lends a mild sage/mint-like flavour to dishes.
For the home brewer ground ivy is well worth foraging for during spring. It lends an aromatic bitterness and has renowned abilities to clarify ale, for which it was once popularly used.
If you are wanting to learn more about wild food foraging then you can book a place on to one of my upcoming foraging walks and courses. If you would like to read more about the easily found plants of late winter and spring, then check out my seasonal wild food guides, as well as my new monthly foraging highlights.
If you are planning lots of foraging adventures this year, then you may want to read this article on harvesting wild plants. You need never miss a trick during the new foraging year with these colour coded, seasonal harvesting charts, and with this set of pocket-sized, waterproof I/D cards, youcan get instant I/D help. The cards have ben designed to help you begin to confidently identify plants in the field.