Tuesday, August 12, 2025

Polaris of Enlightenment

Spring greens from the Nordic pantry

Published 18 May 2025
– By Editorial Staff
Wood sorrel takes many Swedes back to childhood.
8 minute read

Many people remember the sour taste of wood sorrel, or how dewdrops filled the grass on the lawn in the morning, but over the years they have forgotten that these plants are actually edible. In the forest, on the lawn, and even in the city, there are lots of herbs and other plants that can be eaten during the green season in spring.

However, it is important to remember that Nordic plants can often be poisonous, so you should never eat anything you are unsure about.

The darkness is receding and light is returning to the Swedish landscape. With light, sun, and more warmth, the earth is slowly thawing and the leaves are spreading their buds. The green leaves are not only a delight that brings spring feelings, but also contain a lot of edible plants. In Sweden, there is plenty to eat in nature besides the well-known lingonberries and the wide variety of mushrooms that attract people to the forest. There are also weeds, trees, bushes, and flowers. In this article, we take a look at some of the edible herbs and leaves of spring.

In Sweden, the forest is there for everyone through the right of public access, but you should always respect both the landowner and nature. For some things, such as trees, you need the landowner’s permission to pick, and you should not pick more than you will use. It is also important to think carefully when you are in the forest, as it is easy to get lost.

Many edible plants are found not only in forests but also in cities, but you should always avoid picking them along roads due to exhaust fumes. If necessary, you can use Stans Flora to learn how to recognize different plants. It is important to remember never to eat anything you are not sure about, as there are many poisonous plants in Sweden that can have disastrous consequences if ingested. Read up, look carefully, and never guess.

Blueberry leaves (Vaccinium myrtillus)

Harvest: May to June

Most people know that blueberries are edible, but not everyone knows that the leaves are edible too. Blueberries themselves are very healthy, but the leaves also have many beneficial qualities. Among other things, they contain flavonoids, which act as effective antioxidants, as well as neomyrtelin, which is said to be good for type 2 diabetes, according to Läkeörter.se. The leaves contain vitamin C and chromium.

The best way to use blueberry leaves is to make a decoction, i.e., tea. Fresh leaves are perfectly fine to use, but you can also dry them and use them during the winter. Blueberry leaf tea is said to counteract diarrhea and stomach problems, as well as have blood sugar-lowering properties and be good for urinary tract problems.

Pick the leaves before the berries appear. Photo: Ann-Sophie Qvarnström/Public Domain

Shepherd’s purse (Capsella bursa-pastoris)

Harvested: April to November

The plant has a slender stem with white flowers and grows in meadows. Along the stalk there are fruit pods that are slightly heart-shaped. It is one of the most common weeds and is found throughout Sweden, except in the mountains.

You can eat the whole plant, except the root. It is said that the shepherd’s purse was already used as food in the Stone Age.

The fruit pods in particular have a taste reminiscent of ginger and mustard. The young leaves can be used in salads, or they can be dried and used later in cooking. One tip is to make spiced butter from the unripe fruit pods.

The shepherd’s purse is said to have a hemostatic, bactericidal, anti-inflammatory and vasoconstrictive effect, making it effective in wound care. It can be dried and powdered, for example, and then used and sprinkled directly on wounds to stop bleeding.

It is also high in iron, calcium, vitamin K and vitamin C. It can be confused with the field pennycress, but it is also edible. It is also said to have been used against chills in the past.

Avoid eating it during pregnancy and if you have problems with kidney stones or kidney disease.

Shepherd’s purse. Photo: Andreas Rockstein/CC BY-SA 2.0

Wood sorrel (Oxalis acetosella)

Harvested: April to October

This classic herb likes to grow in wetter woods and has three heart-shaped leaves that resemble clover. Both flowers and leaves can be eaten. Its flowers, however, are similar to those of wood anemone, which is poisonous to eat, but the difference is that wood anemone flowers have white seed stalks and pink veins. Both also flower around the same time in May. So look carefully to make sure it’s not an accidentally picked-up wood anemone, especially if children are around.

The wood sorrel is often called the barometer of the forest because it sheds its leaves when it rains.

The herb has a sour taste, which comes from the poison oxalic acid. However, eating foods with oxalic acid is not toxic, but you should not eat large amounts (which is difficult to do with resin acid). If you suffer from kidney stones, you should not eat anything with oxalic acid in it. The acidic taste is suitable as a flavor enhancer in sauces or salads, for example. It is also good in desserts or mixed in water for a mealtime drink. Or why not go for a snack on your walk?

It grows throughout Sweden, except in northernmost Norrland.

Wood sorrel. Photo: Tero Karppinen/CC BY 2.0

Lady’s mantle (Alchemilla vulgaris)

Harvested: May to July

Perhaps as a child you used to pick lady’s mantle from the lawn and drink the morning dew that collected, if nothing else, the common plant is probably recognized by most people. It is found throughout Sweden and is common, in addition to lawns, also in meadows. It can also be found in the forest.

The leaves are bowl-shaped and it has small yellow-green flowers.

The name Alchemilla comes from the belief that the water droplet formed in the plant’s bowl was an important ingredient for alchemists.

Traditionally, the plant has been used as a medicinal herb and is said to be good to drink during pregnancy. It is also said to have been used after childbirth as the tannins in the plant can help tighten the skin, so it has also been used as a compress for wound healing. For this reason, it is also said to be beneficial to drink lady’s mantle decoction during heavy menstruation.

It has also been called “a woman’s best friend” as it is said to be good for facilitating regular menstruation and also relieving menopausal symptoms.

It also contains essential oils and saponins, which together with the tannins can prevent chapped skin.

Both leaves and flowers can be eaten. Cut off the leaves at the base and the plant will continue to grow. Dry and use as a tea, or as a salad topper. Make a decoction and then use as an astringent toner.

Lady’s mantle. Photo: Alexandre Dulaunoy/CC BY-SA 2.0

Birch leaves (Betula spp.)

Harvested: May to June

The white-black tree is easy to recognize. In spring, the leaves start to bud on the tree and this is when they are best to pick. Birch leaves are useful both internally and externally.

Birch leaves have long been used to give the body an extra boost after winter. The leaves can be used as a tea and provide a range of benefits to the body. Among other things, they are said to be high in vitamin C, but also to help support the kidneys and clear waste products from the body. The leaves are also said to be anti-viral and anti-inflammatory, and good for rheumatism.

Furthermore, you can also make an infusion of the leaves and use it as a toner, which is supposed to help clearer skin. It is also said to be good for eczema. Why not take a bath with birch leaves to benefit the whole body?

If you want to try a natural shampoo or household cleanser, mix a liter of water with a deciliter of fresh leaves. Leave for 24 hours, stirring occasionally. After that, you can strain the leaves and it should have created a form of soap. You can use this for your hair or to scrub with.

Photo: Bengt Littorin/ CC BY 2.0

Stinging nettle (Urtica dioica) and whitetop (Lamium album)

Harvested: March to August

Stinging nettle is found throughout Sweden, grows a little everywhere and should be picked with gloves because it burns. It can be picked as a shoot but also as a fully grown plant.

The plant is very rich in vitamin C and is relatively rich in protein. It also contains iron, calcium, phosphorus, silicon, manganese and sulphur.

However, do not pick stinging nettles on nitrogen-fertilized soil or near manure gardens. Nettles have the ability to store nitrates which can be harmful to eat in large quantities.

It can be used as spinach in hot dishes and can also be dried and used as tea. The seed pods can also be picked and dried, which can be added to muesli for extra energy. Nettle soup is also a popular dish.

The white dead-nettle is very similar to the stinging nettle, except that it has white or red flowers (red thistle). However, it has no stinging hairs. It’s also a very common plant and you can eat both its leaves and flowers. Making tea from the flowers is said to be particularly good and tastes sweet and toffee-like. It is common for children to suck nectar from the flowers.

Stinging nettle and white dead-nettle. Photo: Andreas Rockstein/CC BY-SA 2.0

Water avens (Geum rivale)

Harvested: April to October

The herb is said to have gotten its Swedish name humleblomster (bumblebee flower) because the flower mimics the hindquarters of a bumblebee. The flower grows throughout the country and is part of the Dianthus genus, which means it can be confused with carnation, which is not poisonous. Carnation, on the other hand, has yellow flowers, while hop flowers are more purple-brown in color. It usually grows in wetter areas. The root, which is best picked in spring, has a sweetish flavor and can be used to make a chocolatey drink by peeling the root and placing it in a saucepan filled with water. Bring to the boil, then remove from the pan and leave to stand for 20 to 30 minutes, then strain out the roots and add sugar and hot milk. The shoots can be eaten fresh and the flowers are great for decorating salads, for example. The leaves can be added to a soup or used in stews.

Traditionally, a decoction of the root has been used internally for chills, fever, diarrhea, and intestinal and stomach issues. Externally, it has been used to treat various skin conditions such as blotchy skin, acne, and freckles. In folk medicine, the root has also been used for its anti-inflammatory, antiseptic, and astringent properties.

Water avens. Photo:Thibault Lefort/Public Domain

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Radioactive method ready for use against poaching

Biodiversity

Published yesterday 7:45
– By Editorial Staff
Rhinos are being injected with radioactive material.
2 minute read

After an extended testing period, the Rhisotope project in South Africa is now in full operation. The technology, which makes rhino horns both traceable and unattractive to poachers, can now be used on a large scale.

It was in June last year that researchers injected radioactive material into the horns of 20 rhinos in South Africa. The project, called the Rhisotope Project and led by the University of the Witwatersrand (Wits University) in South Africa, began six years ago with the idea of stopping poaching of the endangered rhinos. The concept was that the radioactive material should be detectable at border controls, but also becomes toxic to consume. Furthermore, the radioactive material should be harmless to the rhinos.

Now the project has been thoroughly tested and reached full operational status, writes Wits University in a press release.

We have demonstrated, beyond scientific doubt, that the process is completely safe for the animal and effective in making the horn detectable through international customs nuclear security systems, says James Larkin, professor at Wits University and scientific director of the Rhisotope Project.

Sold as “medicine”

Rhino poaching is a recurring problem, particularly in South Africa. Last year, 420 rhinos were killed illegally in the country, where the horns often end up on the black market. They are often sold as medicine and can be worth more than gold. The treatment is carried out by sedating the rhino and then drilling a small hole in its horn. Two small isotopes with radioactive material are then inserted.

This means in practice that private and public rhino owners, non-governmental organizations and conservation authorities can contact the Rhisotope Project to treat their rhinos with the radioactive material.

Our goal is to deploy the Rhisotope technology at scale to help protect one of Africa’s most iconic and threatened species. By doing so, we safeguard not just rhinos but a vital part of our natural heritage, says Jessica Babich, CEO of the Rhisotope Project.

Swedish crayfish threatened with extinction

Biodiversity

Published 10 August 2025
– By Editorial Staff
From 30,000 population to under 600 – the noble crayfish is critically endangered.
2 minute read

Crayfish plague continues to devastate Sweden’s native noble crayfish. In just a few decades, populations have plummeted from around 30,000 to fewer than 600 – and the trend continues downward.

The biggest culprit is illegal releases of non-native signal crayfish, which are themselves heavily fished and can also be affected by the disease.

The signal crayfish, which spreads the disease, has increased dramatically and today exists in between 10,000 and 15,000 populations. In Värmland, a province in western Sweden, illegal releases have been documented in as many as 239 bodies of water between 2000 and 2024.

— Noble crayfish populations in Värmland and Dalsland were 430 in the early 2000s; today only 60 remain, says Lennart Edsman, crayfish expert and researcher at the Freshwater Laboratory at the Swedish University of Agricultural Sciences (SLU), to Swedish news agency TT.

When August and crayfish season arrives, the question arises of which species the environmentally conscious consumer should choose for their crayfish party.

— You should eat noble crayfish if you can afford it. That gives them value that makes them worth protecting. And you should eat signal crayfish too, but absolutely not spread them, Edsman believes.

Imports worth hundreds of millions

Swedes eat far more crayfish than the country can produce. Between 70 and 80 percent of the crayfish on tables are imported. In 2023, imports amounted to a value of €40 million, while Swedish crayfish were sold for €27 million.

Previously, the largest portion of imports came from China, but today Spain, Turkey and also Egypt dominate the Swedish market.

Most Swedish-caught crayfish are signal crayfish, with a large share coming from lakes Vättern and Hjälmaren in central Sweden. Recently, however, many consumers have complained that the crayfish have become smaller.

— This is partly because fishing has been too intensive. There is great demand for crayfish in this country. Sweden is quite extreme when it comes to crayfish consumption, Edsman explains.

The signal crayfish originates from western North America, as does crayfish plague – a parasitic algae fungus. Although the species is more resistant than the noble crayfish, it is not immune to the disease.

How the signal crayfish took over

The signal crayfish originally comes from western North America and was introduced to Sweden in the 1960s as a way to replace the noble crayfish, which had been severely affected by crayfish plague at the time. The idea was to preserve crayfish fishing and its economic benefits, since the signal crayfish is more resistant to the disease than the noble crayfish.

The problem is that the signal crayfish carries the very crayfish plague – a parasitic water mold – that is deadly to the noble crayfish. Although the invasive species itself can be affected, it is significantly more resilient, which means it functions as a disease carrier and accelerates the decline of the noble crayfish.

Since its introduction, the signal crayfish has spread rapidly and is now found in between 10,000 and 15,000 populations across Sweden. Many of these have resulted from illegal releases. The consequence is that the noble crayfish has declined from around 30,000 populations to fewer than 600 throughout the country.

New giant insect discovered in Australia

Biodiversity

Published 5 August 2025
– By Editorial Staff
Acrophylla alta lives in a very limited area of high-altitude rainforest.
2 minute read

Researchers have discovered a new species of stick insect. The insect, which can grow to almost half a meter long, is said to potentially be Australia’s heaviest.

It was at high altitude in the Atherton Tablelands in northern Queensland, Australia, that the stick insect was found. Researchers at James Cook University helped identify the new species, which they call Acrophylla alta. The most remarkable thing about the insect is its length and especially its weight: It can grow 40 centimeters long and weigh about 44 grams, which is slightly less than the weight of a golf ball.

There are longer stick insects out there [in the region], but they’re fairly light bodied, says Professor Angus Emmott in a press release. From what we know to date, this is Australia’s heaviest insect.

It was through the eggs that researchers were able to identify that it was a new species, since no species of stick insects have identical eggs.

They’ve all got different surfaces and different textures and pitting, and they can be different shapes, he says.

It is not uncommon for new insect species to be discovered, but the reason this heavy insect has gone unnoticed is likely due to its habitat. These insects live in a limited area of high-altitude rainforest and live high up in the tree canopy. Emmott also believes it is precisely their living environment that has made them so large.

It’s a cool, wet environment where they live, he says. Their body mass likely helps them survive the colder conditions, and that’s why they’ve developed into this large insect over millions of years.

Protect yourself from horseflies this summer

Published 29 July 2025
– By Editorial Staff
Horsefly: Tiny body, big summer nuisance
2 minute read

Bites from horseflies can both hurt and cause allergic reactions. Here’s what you can do to avoid being bitten.

In the Nordic countries, parts of the summer have offered warm and humid weather, which means a delight for the summer pest horsefly to thrive in. Summer is not yet over and neither is the risk of being bitten by a horsefly.

Horseflies, also called clegs, don’t bite by stinging like mosquitoes, but cut open the skin with their mouthparts, which makes the bites more painful. Only females suck blood, which they need to develop their eggs. Males, however, are harmless and feed on nectar and pollen, making them pollinators.

The summer pest often stays near water, in pastures or by stables and mainly during daytime when the sun is shining.

Treat bites

Bites can cause symptoms such as swelling, itching and even allergic reactions. Often it’s not a major danger, but more an irritating element after a day at the beach. However, if you want to be on the safe side, you can clean the bite. If you’re very bothered by the bite, you can relieve it by dabbing with an aloe vera product or applying a local anesthetic ointment. For severe reactions, it can also be good to take antihistamines.

Don’t look like a flower

To avoid being bitten by horseflies, it can be advantageous to neither smell like nor look like a flower, writes Land.se (a Swedish agricultural publication). That is, avoid both colorful clothes and perfume. If you see a horsefly swarm, it’s best to be still and quiet, so maybe it will pass by. Horseflies are also attracted to sweat, something that’s harder to avoid in the heat. Mosquito repellent can to some extent help against being bitten.

Food also attracts horseflies, so you can for example cover the food before eating if dinner is to be consumed outdoors.

Don’t panic

If you happen to end up in a swarm of horseflies, it’s best not to panic. Keep your mouth closed, otherwise there’s a risk of being bitten in the mouth, and it can also be good to close your eyes – but a tip is to take in the surroundings first so you don’t stumble into a tree.

Then you should move slowly away from the swarm, with your arms as still as possible.

Think about your clothes

Avoid loose-fitting clothes since the horsefly can accidentally get caught between the fabric and body, which of course risks bites. Going barefoot should also be avoided. Preferably you should have full-coverage clothing if you want to be more certain not to be bitten, which also means having something on your feet – barefoot in the grass is therefore not a good idea.

It’s better to dress light and matte, than dark and shiny. Especially black and blue are colors that horseflies are attracted to.

Fact: Horse flies

Horse flies are large, blood-sucking flies that belong to the family Tabanidae and are found throughout Sweden, particularly during warm summer months. The country has around 45 species distributed across several genera.

This summer pest is recognizable by its robust body structure, large eyes and patterned or spotted wings. Body length varies between 6 and 25 millimeters depending on species.

Among the most common species in Sweden are the deer fly (Chrysops relictus), which is silent and fast, the notch-horned cleg fly (Haematopota pluvialis), which thrives in the northern parts of the country, and the pale giant horse-fly (Tabanus bovinus), one of the largest and most aggressive.

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