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Jeremy Bartlett's LET IT GROW blog

The wonder of plants and fungi.

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"People from a planet without flowers would think we must be mad with joy the whole time to have such things about us." - Iris Murdoch

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Wild Strawberry, Fragaria vesca

Jeremy Bartlett's LET IT GROW blog Posted on 8 June, 2019 by Jeremy Bartlett8 June, 2019

Wild Strawberry, Fragaria vesca

Yesterday I ate my first Wild Strawberries of the year and they were delicious. Sorry, I would have shared some with you, but there were only a handful and they’ve all gone now. But there will be more soon.

The fruits of the Wild Strawberry are a treat at this time of year and have a concentrated flavour that makes up for their small size. (I would describe it as concentrated strawberry with a slight hint of bubblegum.) The plants don’t flower and fruit all at once, either, so you can keep going back for more.

Both photographs on this page were taken on 6th June 2019 – the ripe fruit, which I picked, was from a sunnier part of the garden than the plants that were in flower.

Wild Strawberry, Fragaria vesca

Wild Strawberry, Fragaria vesca, is a low growing perennial herb that can be found throughout the British Isles. It is also native throughout Europe and in Western Asia, and has been introduced to other parts of the world, such as the Eastern United States and parts of Africa and Eastern Asia. It is a member of the Rosaceae (the Rose family), and has the typical showy flowers of many family members, with five white petals, five sepals and many spirally arranged stamens.

Wild Strawberries like to grow in fairly dry places in the UK, in woodland, hedgerows, amongst scrub and on basic rock outcrops and screes. Manmade habitats include the floors of quarries and old railway embankments.

Wild Strawberries spread by seed but also by their stolons, stems which grow just above the surface of the soil, producing new plants at the nodes. (Cultivated strawberries have them too and we usually call them runners and use them to propagate more strawberry plants.)

The “berry” part of the name is not strictly accurate. The fleshy part of a strawberry is actually the swollen receptacle of the flower and each “seed” on the outside of the strawberry is an achene, a dry fruit which contains the seed (note 1).

It is a treat to find Wild Strawberries in the countryside and I remember stopping at the roadside near Trollhättan in Sweden, while on a cycle touring holiday, to snack on the fruit. (It’s best to avoid fruit at ground level near a well used path, in case of canine contamination.)

Wild Strawberry fruit are eaten by a variety of mammals and birds and the leaves are sometimes eaten by deer. Fragaria vesca is also one of several foodplants of the caterpillar of the Grizzled Skipper butterfly.

For a more reliable supply of fruit, Wild Strawberries are a lovely plant to grow in a garden, where they prefer (the mythical) moist but well drained soil, ideally slightly alkaline.

In 1992 I bought a couple of Wild Strawberry plants in a pot from Natural Surroundings and planted them in our previous garden, where they soon spread. I transferred some to our allotment, where they grew as groundcover under a Kentish Cobnut tree. I brought some to our current garden when we moved house.

We have rather dry, sandy soil in the garden and on the allotment, which can be a problem in very dry summers (note 2). Most of the allotment plants died off in the summer of 2006. In the current garden, I planted Wild Strawberries in a partly shaded border but they were mostly bullied out by Sweet Woodruff. However, they found an ideal growing spot in gravel under a bench. In the sunniest places, some of the leaves went a bit crispy last summer but the plants revived and are now doing well. The fruit is better in sun but the plants survive drought better in shade, so it’s a good idea to let the plants spread around and some should always thrive. Wild Strawberries also look good trailing from containers, as long as you keep them watered in summer: add some composted bark to a peat free potting compost.

Fragaria vesca is also known as the Alpine Strawberry, Mountain Strawberry or Wood Strawberry. There are several cultivars, including ‘Alexandria’ (which doesn’t have runners) and the more refined ‘Mara des Bois’ (with larger fruit, developed in France in the 1990s). We grew both of these in the early days of Grapes Hill Community Garden, along with the wild form. They all tasted good, but the wild form did much better in the droughty conditions beneath shallow rooted Ash trees.

I also grow the Plymouth Strawberry, Fragaria vesca var. ‘muricata‘. Its flowers are green and leafy and the fruits are covered in spines. The plants seem less vigorous than the wild type. I grow it purely as a curiosity, in a different part of the garden, so the two varieties don’t mix.

The most obvious use of Wild Strawberries is to eat their fruit. However, the fresh or dried leaves can be used to make tea. Jekka McVicar (note 3) suggests adding the mashed fruit to facepacks to whiten skin and lighten freckles or applying cut strawberries to ease slight sunburn. (“If you get bored you can always eat them”.) If you have sore gums or mouth ulcers, the leaves can be used to make a gargle and mouthwash.

Wikipedia lists some of the phytochemicals found in strawberries (the cultivated hybrids, rather than Fragaria vesca, but the compounds should be similar for Fragaria vesca), including a long list of chemicals that give the fruit its characteristic fragrance. Strawberries are a good source of Vitamin C and manganese. However, a small percentage of people are allergic to them.

Larger, cultivated strawberries are not just highly bred Fragararia vesca. They are Fragaria x ananassa, a cross of Fragaria virginiana (Virginia Strawberry), from eastern North America, and Fragaria chiloensis (Chilean Strawberry), from Chile. The parents grow in totally separate parts of the world and the hybrid was produced in Brittany (Bretagne) in the 1750s. Wikipedia provides a good account of strawberry cultivation throughout the world: in 2016, world production of strawberries was 9.2 million tonnes. I grow cultivated strawberries on the allotment. Like Fragaria vesca, they suffer in drought on light soil in full sun, but I always get a decent crop of fruit, which have a lovely flavour. Nowadays, commercially grown strawberries can be as good, but in the past I have eaten large, bland and disappointing fruit from irrigated, over-pampered plants.

One other possible source of disappointment is to confuse Barren Strawberry for Wild Strawberry. Barren Strawberry, Potentilla sterilis, is a relative of Fragaria vesca, and a lovely plant in its own right. It is superficially quite similar but there is no point in looking for tasty red fruit. Barren Strawberry has only has small, hard achenes and is “quite un-strawberry like both in flavour and texture“.

The leaves of both plants have three leaflets but Barren Strawberry leaves are much less glossy and have fewer teeth and it is only half the height of Wild Strawberry. Barren Strawberry flowers earlier in the year than Wild Strawberry (February to April, rather than April to July) and the flower petals are notched and widely separated. The Wild Flower Finder website has good photographs of both Potentilla sterilis and Fragaria vesca.

Although cultivated strawberries are sometimes grown on straw, which stops soil splashing onto the fruit, this isn’t how the name is thought to have arisen. In Anglo-Saxon “straw” meant small pieces of chaff, referring to the achenes (pips) on the outside of the fruit (note 3). Fragaria is from the Latin word for strawberry, related to fragrans, meaning fragrant. Vesca comes from the Latin for small or thin.

Notes

Note 1 – If you thought this was complicated, I suggest you read my post about nuts from December 2012.

Note 2 – At Noar Hill in Hampshire, the Wild Strawberries frizzled up in the 1976 drought, leading to  extinction of the Grizzled Skipper colony there. Matthew Oates (2015), “In Pursuit of Butterflies: A Fifty Year Affair“, Bloomsbury, London. Page 99.

I was a bit worried that this might have happened in the summer of 2018 at Stoke Ferry Cut-off Channel, one of Norfolk’s two remaining sites for Grizzled Skipper, but I’m glad to say that the butterflies were alive and well this spring, and Wild Strawberry was still growing there.

Note 3 – Jekka McVicar (2009), “Jekka’s Complete Herb Book“, RHS, London. Pages 114 and 115.

Posted in Edible, Foraging, Ornamental | Tagged Alpine Strawberry, Barren Strawberry, Fragaria vesca, Fragaria x ananassa, Mountain Strawberry, Potentilla sterilis, Strawberry, Wild Strawberry, Wood Strawberry

Field Cow-wheat, Melampyrum arvense

Jeremy Bartlett's LET IT GROW blog Posted on 28 May, 2019 by Jeremy Bartlett28 May, 2019
Field Cow-wheat, Melampyrum arvense

Field Cow-wheat, Melampyrum arvense

Last week we went back to the Isle of Wight for a week (see my 2016 blog posts about Ribwort Plantain and Ivy Broomrape). We saw twenty species of butterflies, 29 species of bees and lots of  other interesting invertebrates, Wall Lizards, a Red Squirrel and several new species of plants. The most spectacular and beautiful of these new plants was undoubtedly Field Cow-wheat, Melampyrum arvense.

Field Cow-wheat is now a rare plant in the British Isles, and is found in only four sites in South-east England. It is a member of the family Orobanchaceae, along with Ivy Broomrape and Purple Broomrape. It is a hemi-parasite: it possesses chlorophyll and makes its own sugars but it also takes some of its nutrients from its hosts, which include grasses and crops such as alfalfa.

Field Cow-wheat is an annual. It grows to 50cm tall and has upright stems with opposite pairs of lanceolate leaves, topped by flower spikes from May to September. Our plants were just beginning to flower on 23rd May. The flowers are mauve and yellow and grow from long, spiky mauve bracts. I can recommend the superb photographs and descriptions on the Wild Flower Finder and NatureGate websites. The Wild Flower Finder website describes the unopened flowers as “like a Guppie fish or some kind of whale with a trimeran or speed-boat type keel. Note too the walrus-type moustache.” The bracts have minute nectar-producing glands which attract ants, bumblebees and other insects. The flowers are pollinated by bumblebees.

Field Cow-wheat was first recorded in the British Isles in 1724, introduced accidentally as a contaminant of crop seeds. Elsewhere in Europe the plant is a more ancient introduction, classed as an archaeophyte, a plant introduced before 1500.

In the 19th and early 20th Century, Field Cow-wheat could be a major nuisance for farmers and on the Isle of Wight it acquired the local name of ‘Poverty Weed’. It was “so abundant as to render the bread discoloured and unwholesome, the seed being ground up with the wheat”. The plant’s scientific name is made up of arvense (Latin for ‘of cultivated land’) and Melampyrum, from the Greek words melas– (‘black’) and –pyros (‘wheat’). By the 1930s, improved preparation techniques resulted in cleaner flour and began the demise of the plant.

Field Cow-wheat seeds contain a iridoid glycoside, aucubin. Aucubin is slightly toxic and may make plants less attractive to herbivores; it is also found in (and named after) Aucuba japonica, the Spotted Laurel. Aucubin has antimicrobial and anti-inflammatory properties and appears to protect against liver damage and to speed healing of oral wounds.

Outside the British Isles, Field Cow-wheat is distributed throughout Western Europe, with the exceptions of central and southern Spain, southern Italy, Ireland, Iceland, Norway, central and northern Sweden, and northern Finland. It can also be found in parts of Turkey and the Ural Mountains.

Field Cow-wheat is in decline in  Britain, France, Belgium, Germany, the Netherlands and Finland. In Britain, its decline is due to improved seed cleaning, agricultural intensification. The plant is also intolerant of both strong competition and heavy grazing. Fortunately, the site where we saw it is being well managed by the Hampshire and Isle of Wight Wildlife Trust and the plant is gradually spreading from a bank into the adjacent field.

 

detail of Field Cow-wheat flower

“Like a Guppie fish or some kind of whale with a trimeran or speed-boat type keel. Note too the walrus-type moustache.” Field Cow-wheat, Melampyrum arvense, in close up.

Posted in Ornamental | Tagged aucubin, Field Cow-wheat, Melampyrum arvense, Orobanchaceae, Poverty Weed

Nail Fungus, Poronia punctata

Jeremy Bartlett's LET IT GROW blog Posted on 8 May, 2019 by Jeremy Bartlett14 November, 2019
Nail Fungus, Poronia punctata

Nail Fungus, Poronia punctata, at Buxton Heath.

At the end of April a group of us visited Buxton Heath, just north of Norwich. We had mainly gone to look for insects but it was a cold day with light rain and, apart from some dung beetles, most of the insects we’d hoped to see had sought shelter.

Nonetheless, we had a good walk and up on the drier heath I was very pleased to find something I hadn’t seen before: Nail Fungus, Poronia punctata. It is a very distinctive species, which looks rather like one of those flat-headed nails used to fix bituminous roofing felt to the roof of a garden shed. The First Nature website has some great photographs. The cap of the fungus has distinctive pores, hence the generic name, Poronia.

Nail Fungus appears in autumn but persists through winter into spring. It can be found growing on dung in open areas, such as grassland and heathland, where ponies graze. It is an ascomycete in the family Xylariaceae, and therefore is a relative of Cramp Ball (King Alfred’s Cakes, Daldinia concentrica), which I wrote about last May.

In Britain Nail Fungus grows on pony dung but in other parts of the world it has also been found on the dung of cows, sheep and elephants.

Nail Fungus is a declining species in Britain and throughout the world. At the time of writing it was being assessed for the Red Data List for fungi. Its decline is due to the reduction of natural and semi-natural grasslands and the use of agrochemicals, pesticides and veterinary additives. In her MSc thesis Nicola Edwards studied the fungus at Hockwold Heath and Cranwich Camp in Norfolk, and found that dung needed to be damp enough and have a reasonable amount of dung beetle activity for the fungus to grow (note 1).

Poronia punctata is a UK Biodiversity Action Plan species. The NBN Atlas lists 198 British records and shows its distribution in the British Isles. A century ago it was quite common but it declined until The New Forest in Hampshire was one of its last strongholds. Now that ponies are being used more widely for conservation grazing the species is cropping up more frequently again and it has been recorded from Dorset, Hampshire, Surrey and even London. In Poland, the species was rediscovered in 2016, after an absence of a hundred years.

In Norfolk Nail Fungus was rediscovered in Thetford Forest in 2012, the first record for the county since 1944. It has been seen a few times since then, including by James Emerson at Holt Lowes last autumn (note 2). It was good to have seen Nail Fungus on Buxton Heath.

Nail Fungus is considered to be inedible. Even if it wasn’t rare, Nail Fungus would not be a species for fungal foragers, as it is small and grows on dung. As the First Nature website says: “who would even want to try eating them?“. However, some scientists are interested in the fungus because it contains a number of bioactive compounds, including a group of sesquiterpenes known as punctaporonins, which inhibit the growth of competing bacteria and fungi in dung.

Notes

Note 1 – See “Does Breckland vegetation and its management influence abundance of Poronia punctata?“, Nicola Edwards, MSc thesis, Sparsholt College, 2015.

Nicola found that the anthelmintic drug pyrantel wasn’t detrimental to the fungus, presumably as it didn’t reduce the number of dung arthropods. However, elsewhere, the anthelmintic drug ivermectin has been implicated in the decline of dung beetles, which will presumably have a knock-on effect on Nail Fungus.

I’m glad to say we found good numbers of Minotaur Beetles on Buxton Heath when we visited.

Note 2 – Nail Fungus was plentiful at Holt Lowes when I visited at the end of October 2019.

Posted in Fungi | Tagged Nail Fungus, Poronia punctata

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