Saturday, July 26, 2025

Polaris of Enlightenment

Discover autumn’s edible plants

Published 14 September 2024
– By Editorial Staff
Even in autumn there are plenty of edible plants to pick.
5 minute read

Despite the end of summer, there is still plenty to pick when it comes to edible plants. Heather grows in the forest, which according to Swedish folklore should not be brought into the home, but which can be effective against gastritis. A common lawn weed that grows in the autumn also contains a lot of nutrients.

As summer turns to autumn, much of the Swedish vegetation begins to wither as the heat fades. However, there are a lot of herbs and other plants that grow into autumn, and also a lot to pick all year round in both forests and fields.

Sweden’s “right of public access” (allemansrätten) allows people to pick many plants, mushrooms and berries in the country’s forests and fields. Remember, however, that one needs the landowner’s permission to pick the fruits of trees and certain other plants. Also, never pick more than you need, and remember that many plants are food for other animals.

One thing that is always important is to never eat anything you are unsure about, as many of the country’s plants can actually be very poisonous.

Chickweed (Stellaria media)

Harvested: All year round

This herb is a very common weed and grows mainly in gardens throughout the country. It grows in large stands and has egg-shaped leaves with small white flowers. It can also be recognized by the hairs on one side of the stem. In Sweden, it is the most common herbaceous weed.

It has many different names, but is most commonly called chickweed because it is often eaten by birds. It is also called fat grass and reed grass.

You can eat its leaves, flowers, shoots and stems. It is rich in carbohydrates and protein with a good amino acid composition. The herb also has a high content of ascorbic acid, i.e. vitamin C. The leaves also contain minerals and trace elements such as calcium, potassium, phosphorus, copper, magnesium, iron and zinc. It is also said to be rich in antioxidants. In short, it has a high nutritional content compared to other green plants.

The plant is often used raw in salads where you can mix in the whole plant, flowers and all. It is also said to be great for making pesto. The flavor is described as mild, grassy and spinachy. It is best to cut the tops and avoid getting the slightly coarser parts of the stalk further down. It should also be good to fry in butter and then flavor with salt, lemon and nutmeg.

The chickweed is said to be expectorant and therefore good for coughs. It has also been used to treat rheumatic pain, kidney problems, hemorrhoids and asthma. It is also said to have been used in folk medicine to bandage wounds. The leaves also have a moisturizing mucilage that makes it effective against sunburn or eczema, for example.

Chickweed. Photo: Harry Rose/CC BY 2.0

Hairy bittercress (Cardamine hirsuta)

Harvested: March to November

This herb, often considered a weed, grows along the coastal strip up to the central parts of Sweden. It grows in various places such as forest edges, rock outcrops and gravel fields. It flowers in spring, but continues to grow until November. It is paired at the base and then has up to seven pairs of small leaves, as well as some hairy stem leaves and white flowers. It can be easily confused with other brambles, but all in the genus are edible.

The flavor is mildly peppery and you can eat the leaves, flowers, seeds and shoots. It can be used raw in salads, but also in soups or stews. However, it can lose some of its flavor if cooked, so it’s best to add it towards the end. The seeds can be used as a spice.

It contains some carbohydrates and proteins, but also potassium, calcium, magnesium, iron and zinc. It is also said to have antibacterial, antifungal, antiviral and antioxidant properties.

Traditionally, it has been used for inflamed hemorrhoids, coughs, whooping cough and indigestion. It is also used to make a paste that can be applied to wounds.

Hairy bittercress. Photo: Andreas Rockstein/CC BY-SA 2.0

Heather (Calluna vulgaris)

Harvested: July to October

Autumn heather, as it can also be called, is a dwarf shrub found throughout the country. It often grows in poor soil on moors, in sparse forests, pine bogs and rocky ground. Heather grows to a height of between 20 and 80 centimeters, has coniferous leaves and light purple flowers. It can be confused with the bell heather, but it has urn-shaped flowers instead.

Heather is a common decorative plant, especially in autumn and winter. It is also the landscape flower of Västergötland.

According to Skogsskafferiet, you can eat the stem, flower and leaves of heather. The plant is mainly used as a herbal tea, which is said to have a calming and anaesthetic effect. It is also said to be effective against gastritis, in which case the tea should be taken 30 minutes before meals. Traditionally, heather has also been used for its anti-inflammatory and antibacterial properties. It is also said to be used to make an infusion of heather and to bathe wounds. Drinking heather tea can also provide relief from urinary tract infections.

The name “Calluna” comes from the Greek kallyno, meaning “to beautify”. According to Swedish folklore, however, it was not a good idea to bring heather into the home as an ornament, writes Sydved. It could lead to both poverty and death, according to the saying: “Pick heather – die young”. On the other hand, the seeds could be used to enrich flour and the roots were used to make baskets. The plant is also said to have been used for coloring yellow and brown.

Heather. Photo: Tero Karppinen/CC BY 2.0

 

Daisy (Bellis perennis)

Harvested: March to November

It grows on many lawns and pastures, but mainly in southern and central Sweden. They flower almost all year round. The flowers are usually white, but sometimes with pink radius and yellow disk floret.There are also several cultivated varieties in different colors, but the most common is red.

They resemble ox-eye daisies (leucanthemum vulgaris) commonly known as prästkrage in Sweden, but are smaller in size. Daisies also grow closer to the ground and often form “carpets” of flowers, while ox-eye daisies often grow higher up with one flower per stem.

Both flowers and leaves are edible. They can be used in salads and the flowers can be sprinkled on any dish. The flower petals can also be used as sprinkles or instead of coconut on chocolate balls.

In folk medicine, it has been used to treat fever and as an expectorant for coughs. It has also been used to treat eczema and fungus. The stems contain a sap that is said to have been effective against pimples.

The daisy. Montage. Foto: New York State IPM Program at Cornell University, Conall/CC BY 2.0

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Recycled plastic may cause hormonal disruptions

Published 24 July 2025
– By Editorial Staff
Recycled plastic pellets from polyethylene can be used to manufacture products such as water bottles.
3 minute read

Recycled plastic leaches chemicals that can affect hormones and metabolism in zebrafish larvae, according to research from Sweden and Germany. A single plastic pellet made from recycled plastic could contain more than 80 chemicals.

Plastic pollution worldwide poses a significant threat to both human health and the environment. Recycling plastic has been seen as part of the solution, but since plastic contains thousands of chemical additives and other substances that can be toxic, and these are almost never declared, dangerous chemicals can end up in recycled products.

To investigate this further, researchers from the University of Gothenburg, Sweden, purchased plastic pellets recycled from polyethylene plastic from different parts of the world. Polyethylene, abbreviated as PE, is a type of plastic used in numerous products such as plastic bags, bottle caps, pipes, ropes, toys, and household items. These types of plastic pellets are used to manufacture products like plastic bags or hard plastic water bottles.

Altered hormones

The researchers let the plastic pellets sit in water for 48 hours. After this, they exposed zebrafish larvae to the water for five days. There, the researchers discovered that gene expression in the larvae changed in genes linked to fat metabolism and hormone regulation.

These short leaching and exposure times are yet another indicator of the risks that chemicals in plastic pose to living organisms. The effects we recorded show that plastic in nature has the potential to alter fish physiology and health, says Azora König Kardgar, lead author and researcher in ecotoxicology at the University of Gothenburg, in a press release.

Furthermore, researchers conducted a chemical analysis of the chemicals that leached from the plastic pellets into water. They discovered a variety of different chemical compounds, but these differed between different pellet samples. However, a single pellet could contain over 80 different chemicals.

We identified common plastic chemicals, including UV stabilizers and plasticizers, as well as chemicals not used in plastic manufacturing, including pesticides, pharmaceuticals, and biocides. These may have contaminated the plastic during its first use phase, before it becomes waste to be recycled. This is further evidence of the complexity of plastic waste flows and the toxic chemicals that contaminate recycled plastic, says Eric Carmona, researcher at the Department of Exposure Science, Helmholtz Centre for Environmental Research in Leipzig, Germany.

Recycled plastic not safe

Previous research has also shown that exposure to toxic chemicals in plastic has similar effects on humans as on zebrafish larvae. Certain chemicals used in plastic are known to disrupt hormones, which in turn can have negative effects on fertility and children’s development, as well as having links to certain forms of cancer and metabolic disorders, including obesity and diabetes. The researchers therefore point out that this is among the biggest obstacles with recycled plastic – that you simply never know for certain which chemicals will end up in an object manufactured from this plastic.

Finally, the researchers conclude that plastic is not recycled in a safe and sustainable way unless dangerous chemicals are addressed.

Our study clearly shows the need to address toxic chemicals in plastic materials and plastic products throughout their entire lifecycle. We cannot produce and use recycled plastic safely if we cannot trace chemicals through the entire production, use, and waste phase, says Professor Bethanie Carney Almroth.

Invasive Asian hornet threatens Nordic honeybees

Published 15 July 2025
– By Editorial Staff
European honey bee on the right, Asian hornet on the left.
2 minute read

The Asian hornet has now been observed in Denmark. There are concerns that European honeybees are increasingly threatened, including in the Nordic region.

The Asian hornet, scientifically known as Vespa velutina nigrithorax, belongs to the hornet family and occurs naturally in Asia. It is suspected to have first arrived in Europe with a shipment of pottery from China to France in 2004, and has since rapidly spread to Spain, Switzerland and Germany.

Observed in Denmark

The species has now been observed on the island of Funen in Denmark, and the spread is considered a serious threat to the beekeeping industry, says Astrid Bjerke Lund, communications manager at Norges Birøkterlag (Norway’s Beekeepers’ Association) to the Norwegian state broadcaster NRK.

This worries us. It’s a threat to our honeybees and therefore also to fruit and vegetable production, says Bjerke Lund.

The East Asian honeybee has the habit of forming a ball around invading Vespa velutina individuals and heating them to death, but the European honeybee has not learned this defense method. In Europe, the Asian hornet is perceived as so frightening that European bees don’t dare to fly in the same way as usual.

If the honeybee cannot get out to collect nectar and pollen, they will not survive. That’s why it’s very serious if the Asian hornet comes to Norway, continues Bjerke Lund.

Swedish Board of Agriculture also warns

The Swedish Board of Agriculture (Jordbruksverket) does not rule out that it could become a threat to southern Sweden as well, both to honeybees through predation, and to the European hornet through food competition.

The Asian hornet is somewhat smaller than the European hornet and is dark on the abdomen, except for a yellow band at the rear, while the European hornet has red markings on the abdomen. Additionally, it is known for having yellow legs.

The forest lives when trees die

Biodiversity

Published 4 July 2025
– By Editorial Staff
Leaving a variety of dead trees in forests is vital for many species' survival.
2 minute read

When old trees die, life begins for many other species, according to a new dissertation. Numerous threatened species need dead wood to survive, along with a varied landscape.

Dead wood, meaning dead trees and branches in nature, is vital for about a quarter of Sweden’s beetle species. Many fungal species also depend on dead wood for survival.

Together with microorganisms and fungi, beetles contribute to the decomposition of tree remains, which provides nutrients to the soil and creates habitats for other insects that, in turn, become food for birds and other animals.

However, many of these fungal and beetle species are threatened today, partly because dead wood has become scarce – especially in managed forests. Paulina Bergmark from the Swedish University of Agricultural Sciences (SLU) has examined in her dissertation whether these species are better preserved in landscapes where nature conservation is combined with forestry, often called eco-parks. The state-owned Swedish forestry company Sveaskog established the first eco-parks about 20 years ago, with the aim of supporting species negatively affected by traditional forestry. Today, there are 37 such forests in total.

In five of these eco-parks, Bergmark studied beetle and fungal species living in high-cut stumps. She then compared the results with four areas in regular production forests.

More red-listed species

The eco-parks contained more diverse tree species and good access to dead wood. The production forests had many beetles, but not to the same extent as the eco-parks.

– Generally, we found both more species and a larger number of red-listed species in the eco-parks compared to the production forests, she says in a press release.

The dissertation also highlighted the importance of tree diversity in forests. Different types of dead trees benefit different species, according to Bergmark.

– In the eco-parks’ varied landscapes, there is a larger proportion of forest where both old and young trees contribute to the creation of new dead wood over time. Increasing variation with both deciduous and coniferous trees in different stages of decomposition can be an effective way to strengthen biodiversity in managed forests, she says.

Moose and polecat added as threatened species on Sweden’s red list

Biodiversity

Published 4 July 2025
– By Editorial Staff
The moose population has increased significantly in northern Sweden - but across the country as a whole, there is a clear decline.
2 minute read

The Swedish University of Agricultural Sciences (SLU) has published a new preliminary version of the red list, where the moose and European polecat are now proposed to be classified as threatened species. Meanwhile, the Eurasian otter is considered to have recovered sufficiently to be removed – after a long period of growth.

The red list is a compilation of species deemed to have such small or declining populations that they risk disappearing from the country in the long term. It is updated every five years, and this year’s preliminary version is open for review and reporting until September 15.

The red-listing of the moose may come as a surprise – especially in northern Sweden, where the population has increased in several areas. In several counties, hunting pressure has therefore been increased to reduce browsing damage. However, looking at the country as a whole, the moose population has decreased by almost a quarter over ten years.

– We are not influenced by any societal goals or the forestry industry’s desire to reduce the population, says Henrik Thurfjell, species group manager at SLU’s Species Information Centre, to Swedish news agency TT.

According to Thurfjell, hunting is the main cause of the decline – despite many hunting teams deliberately shooting fewer moose than their allocated quotas.

– While there are concerns about warmer climate and diseases, the main reason is hunting, he says.

Porpoise in danger, otter recovering

Another species causing concern is the Belt Sea harbor porpoise, which often gets caught in fishing nets as bycatch. Meanwhile, some species show clear recovery. The Eurasian otter has steadily increased for several years and is now being removed from the list, thanks in part to efforts to reduce environmental toxins and chemicals in Swedish water environments.

For a species to be reclassified as viable, the rate of decline must have been below 15 percent over three generations. However, even if this requirement is met, the species is kept on the list for an additional five years as a precautionary measure before potentially being completely removed.

The European polecat, now proposed for red-listing, is believed to be declining in numbers – partly due to competition from otters, which inhabit the same environments.

This year’s preliminary list includes more new additions than removals. In total, 210 species have been added, and 228 have received changed classifications compared to the previous list. Among the newly red-listed species are the elder-flowered orchid, sea trout, herring, and the ringed seal – a seal species native to the Baltic Sea.

Being red-listed doesn’t mean a species is immediately facing extinction. The criteria vary depending on the species. A population of under 20,000 individuals may be sufficient for red-listing – but in other cases, such as for the golden eagle, the number must fall below 2,000.

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