Tag Archives: legume

Veg posters from open farm sunday

What a great day, 9 June! Yet another successful Open Farm Sunday at the Hutton Dundee. Crowds of visitors enjoying themselves in sunny weather. The Living Field garden did its bit as before – exhibits on barley and legumes in the polytunnel, potato varieties in the west garden and further science exhibits in the cabins.

Our friends from Dundee Astronomical Society were here again showing people round the new observatory and explaining about the sun, moon and noctilucent clouds. And this year we were helped for the first time by a workshop on cyanotype imagery run by Kit Martin.

The centrepiece was the new Vegetable Map of Scotland, shown top left and centre in the panel above. For more on how it was made, see Vegetable map made real. The map occasioned much comment and wonder that the country was already growing such a wide range of vegetables and could grow much more of its own.

The two posters located next to the Vegetable map are available to view or download here.

The Vegetable Posters

One of the posters – The Vegetable Products of Scotland – explained the background to the original Vegetable map which was first shown at Can we grow more vegetables? The poster is reproduced below as a low resolution jpg image. It is also available as a pdf file printable up to A3 size.

Click for an A3 size pdf of the Vegetable Products of Scotland.

The other poster – Vegetables in the Living Field garden – showed many of the vegetables typically grown in the garden, grouped into leaves, fleshy fruits, roots and seeds. More on the plants can be seen at the garden pages under Vegetables. This poster is also reproduced as a jpeg below and available as a pdf.

Click for an A3 size pdf of Vegetables in the Living Field garden.

Contacts for Living Field activities: gladys.wright@hutton.ac.uk or geoff.squire@hutton.ac.uk

Open Farm Sunday was a joint effort between The Farm, science staff, the events team, the Living Field community and many others.

Beans on toast revisited

The famous Beans on Toast Project was started 7 years ago by student Sarah Doherty and artist Jean Duncan with Geoff Squire and other members of the Living Field team [1]. The project looked at the origins of this seemingly simple meal.

Not so simple in fact – 10 crops, grown in four continents and using masses of water and other precious resources – the product of a highly complex supply chain leading to a tin, a packet and a tub.

This example of the worldwide growing and sourcing of products that go into the food we eat has been used many times by the Living Field, most recently at a Citizen’s Jury event at the Scottish Parliament in March.

Beans on toast a few years on…

Sarah’s been reflecting on the project. She writes –

“Seven years on, I look back at the ‘water footprint’ for the Beans on Toast project as an eye-opening experience!

It was a reminder that there is a story behind everything. Almost everything we eat has travelled a long way to get on our plates. For so much water to go into the humble beans on toast – it baffles me how much more water and effort goes into producing other things.

I recently took up sewing and have been struck at how expensive it is to buy material for making home-made clothes. When mass- produced for high street stores, clothes may seem easy and cheap. However, making material is an energy and water intensive process too often involving crops for fibres such as cotton and linen. 

I’m certainly more mindful of this now which is why I’m learning to cut my wardrobe down to what I really use and like the most! 

At the Citizen’s Jury Scottish Parliament

Geoff was asked to attend a Citizen’s Jury as a specialist assisting the Jurors with background information on the topic being considered.

He used the Beans on Toast example [2] to show, first, that much of the food we eat is not grown here but imported, and second, that most of our pre-prepared food is made from mixing the products of many different crops grown using the resources of other countries.

Beans on Toast relies on haricot bean, tomato, oil palm, soybean, wheat, maize, sugar cane, paprika, onion, and oilseed rape ….. and that’s just the main ingredients. And the food on one plate of it needs several bathfulls of water.

The famous Beans on Toast project continues …

Beans on Toast is an excellent example to show that we need to use less of other countries’ resources and more of our own.

What’s known as the legume-gap or protein gap – the difference between home grown and imports – is massive. We grow just a few percent of the plant protein needed for feeding peole and farm animals.

We have been adding to the information on sourcing food and estimating how much water and nutrients it takes to grow and process food like this [3]. Beans on Toast lives ….

The supply chain deopicted by a youngster at Wormit Primary School following a visit by Sarah and Jean.

Sources, links

[1] Sarah was studying at Durham University when she worked at the James Hutton Institute for about a year in 2012 . She has kept in touch. She last visited in summer 2018. Jean Duncan who worked with Sarah on educational projects with local schools still works with the Living Field project.

[2] The Citizen’s Jury event was held at the Scottish Parliament in Edinburgh 29-31 March 2019.

[3] The EU TRUE project runs currently, coordinated at the James Hutton Institute. Among its aims is to study the global food and feed supply chains, to cut waste and and to raise local production. It’s full title is Transition Paths to Sustainable Legume-based systems in Europe https://www.true-project.eu

Contact for this page: geoff.squire@hutton.ac.uk

Pollinator plants

Want to help stop the widespread decline of bees and other airborne insects? Here are some notes on the Garden’s plants most visited by bumble bees, hive bees, hoverflies and the occasional butterfly. Most of these plants are easy to grow.

One of the main aims of the Living Field garden is to allow native cropland plants some space away from weedkiller treatment and competition with crops. Recent scientific reports have drawn attention to the widespread loss of invertebrate life and insect life in particular. The declines are happening all over the world.

Everyone who owns or manages land can do their bit to support flying insects. Here we show some of the Garden’s plants and plant groups that have offered food and shelter to flower-visitors over the years.

The legumes

Legumes – (upper) sainfoin, (middle) lucerne and white melilot then (lower) tufted vetch – Images by Living Field

The legumes (family: Fabaceae), just ahead of the Composites, are the single most important group supporting wild flyers. The legumes as a whole offer probably the greatest variety and longest flowering season of all plant groups in the garden. They fix their own nitrogen from the air. All parts of the plant are high in protein.

Sainfoin, the melilots and lucerne were once grown or tried as forage crops in Scotland. The clovers, mainly white and red, are still sown, but the red is more commonly seen in the wild. The bumble bees’ favourite of them all is the blue-flowered, tufted vetch (lower images in the panel) – its strings of flowers produced for months on indeterminate sprawling and clinging stems.

The composites – thistles and knapweeds

The composite family – hemp agrimony (upper), greater knapweed, tansy and common thistle (middle), cotton thistle (lower) – images by Living Field..

Next are the composites (family : Asteraceae), each flowering head consisting of many individual florets. Not all species are equally visited, but the best here for pollinators are thistles and knapweeds. The great cotton thistle grows like a small tree, supporting large heads several centimetres across, bumble bees often bustling two or three to a head.

The greater and common knapweeds, hemp agrimony and tansy shown above are perennials, whereas the thistles in the garden tend to be biennial – germinating one year, overwintering as a rosette and flowering the next. The weedy perennial creeping thistle is too invasive in the garden’s small space and though it supports insects is discouraged in favour of other thistles.

Field scabious and teasel

Field scabious in the meadow, attracting a wide range of pollinator species, flowering for the longest period in the Garden – images Linda Ford / Living Field

Of all the species in the garden, field scabious (family: Dipsacaceae) is the one that offers sustenance to flyers for the longest period. A perennial, growing mainly in the meadow, plants put out flower after flower from early summer to late autumn (except in the very dry 2018). If there was one plant that we could grow for the bees, it would be this.

Teasel is a close relative that also grows well here. It self seeds and is mostly biennial. Plants are moved at the rosette stage in autumn or early spring to form clumps that flower in the medicinals bed.

Labiates – mints, sages, deadnettles and woundworts

Labiate family – betony (upper), sage (lower rt) and clary in the meadow – images by Living Field.

The labiate family (Lamiaceae), including mints, sages, woundworts, deadnettles, hempnettles and basils – are well represented among the medicinals and herbs. They grow in sun, in shade and as occasionals anywhere. The large flowered types such as the herb sage are most frequently visited by the Bombus species, while betony tends to attract more of the smaller carder bees.

The smaller flowered species, such as meadow clary (a perennial n the meadow), fields mints, hempnettle and wild basil are less attractive to larger flying insects but have their own specialist range of inverts.

And many more when the weather’s right

These are not the only plants that offer food and shelter for flying insects. Among the first in the year are the flowers and leaves on the garden’s native trees and shrubs. Early summer in the hedges, flowers of wild roses offer a welcoming landing platform for grazing hoverflies.

One of the longest flowering species, not shown here in the photographs, is viper’s bugloss Echium vulgare, one of the borage family. (See it at the Bee plants links below.) Borage itself and the comfreys are also well visited.

Populations of bees and other flower-visitors were very badly affected here by the dry 2018. There was little left in flower by the end of August, while in most years the field scabious and viper’s bugloss are still visited in late October.

The coming year’s weather is uncertain as always, but we’ll try to manage the plants to give the longest possible season to the resident insects and spiders. First out will be the willow ….. .

But not the main crops

Nearly all the plants referred to here are native species or ones introduced long ago and now naturalised. Very few of the crops grown in the region (and the garden) – barley, wheat, oats, peas – support or need pollinating insects.

Oilseed rape fields provide a crop-based source of food for a few weeks early in the year and field beans also offer high-protein flowers much later. But the main sown crops and leys that could provide the right seasonal habitat – the legume forages and grass-clover mixtures – are rare and mostly long gone.

In the broader landscape therefore, the main source of food for flying insects lies in the broadleaf ‘weed’ species that live in crop fields and disturbed margins – in fact most of those shown in the panels above belong in this category. These arable plants, mostly not injurious to crops, have declined over the last century to the point where many of the plants themselves are now rare. It’s no wonder insects apart from pests are having a hard time in cropland.

Contacts

The Living Field’s page on Bee plants give further notes and images of the individual species most frequently visited in the garden.

As usual, the plants are grown and tended by Gladys Wright and Jackie Thompson with help from the farm.

The photographs of the insects on field scabious were taken by Linda Ford on an ideal summer day a few years ago, the others by Geoff Squire. Colleagues from the farm cut the Living Field meadow once a year and trim the hedges in sequence every few years to allow flowering and fruiting (e.g. for roses, willow, hazel).

Contact: geoff.squire@hutton.ac.uk or geoff.squire@outlook.com

Mashlum no more! Not yet

The mixed cereal-pulse crop known as mashlum. Decline after 1950 yet still grown in a few fields. The question of crop mixtures in prehistory.

An earlier article Mashlum – a traditional mix of oats and beans [1] suggested that the mixed cereal and pulse crop known as mashlum had died out in Scotland but no ….. an email from a farmer in Fife, Douglas Christie, confirmed that it was still grown on his farm. Here is a photograph.

Earlier we had related an account from 1925 [2] on the difficulties of growing mashlum and also the benefits. Mr Christie reports that the mixture worked very well, that chemical and nitrogen fertilizer costs were drastically reduced, but that he had to pick the field carefully as some weeds would be difficult to control.

He also overcame some of the problems in sowing and harvesting a mixture reported in earlier accounts from the 1920s. He has a drill  that can sow (direct drill) the two crops at the same time and a grain dresser that can easily separate the two crops after harvest,

Since hearing from Douglas Christie, the Living Field has noticed on Twitter that several farmers in the south of the UK are also working with mixed cereal-pulse crops. A further question arose in correspondence as to their antiquity.

Mashlum in the crop census

That mashlum merited a separate chapter in the 1925 Farm Crops [2] shows how seriously it was taken. It first appeared in the agricultural census [3] under the heading ‘vetches, tares, beans, mashlum for fodder’ between 1902 and 1919. The category in the census then changed slightly to ‘vetches and mashlum for threshing’ which declined to a low point in 1939 (grey symbols in Fig. 1). Presumably the need for fixed nitrogen during shortages caused vetches and mashlum to increase in area almost 10 times during the war years.

Most of this increase was in mashlum, which in the 1940s and early 1950s became the most widely grown legume crop in Scotland – covering more area than beans and peas – and was listed in the census simply as ‘mashlum for threshing’ (orange symbols in Fig. 1) , that is, grown and harvested for seed.   After a few years, it declined again in the early 1950s and had almost died out by 1960. In 1961, mashlum disappeared from the census and any remaining fields were combined with ‘other crops for stockfeeding’ (green symbols to the right of the trace in Fig. 1).

Fig. 1 The area sown with mashlum and related crops in the agricultural census in Scotland, 1902-1978 [3]. Mashlum was listed as a separate item in the crop census from 1944 to 1960 (orange). Before that it was part of ‘vetches, tares, etc.’ up to 1919 (light blue-grey), then vetches and mashlum for threshing (grey). Any crops remaining after 1960 were counted as part of ‘other crops for stockfeeding’ (green symbols).

The period from the late 1950s to the 1980s was the time of rapid increase in the use of mineral nitrogen fertiliser.  The cereal-pulse mix became uneconomical.

Despite its temporary revival in the 1940s, mashlum, as all other legume crops, was grown on a small part of the arable surface in the 20th century, generally less than 1% of it.

Cereal-pulse mixtures in prehistory?

A question then arises as to how old is the practice of sowing mixed  cereals and pulses. The Dictionary of the Older Scottish Tongue (DOST) finds that mashlum, in the spelling mashloche, was in use more than 500 years ago [4], but that in itself tells little of the crop’s ancestry. Was the method handed down from earlier Bronze or Iron Age  farmers to the medieval period or was it brought over by the Romans or early Christians?

The archaeological record in the north of Britain is thin on peas and beans: there is one record of field beans in Scotland  – also known as horse bean and Celtic bean, now faba bean.  Peas and beans appear far less frequently than cereal grains, but this difference is often attributed to the methods of cooking them: beans are less likely than grain to be charred and hence preserved. In an authoritative survey beans and cereals were examined in 75 locations in southern England [5].

At some archaeological sites, beans and cereals, such as emmer wheat, are found together and in numbers that suggest they were both grown as crops for food. Descriptions of the finds at Foster’s Field, Sherborne in Dorset  for example, include the line that beans ‘may have been grown as a mixed crop with barley or as part of a crop rotation system’ [6], a statement repeated in the broader survey [5].

The archaeologists agree that presence itself does not mean anything definitive about how the crops were grown – whether alone, in broadcast mixtures, or in rotation or sequence. It is not hard to imagine, though, that cereal-pulse mixtures have been used from the earliest times. Imagine a household or village had some cereal and some legume seed, not enough to be sown alone, but together they would make a field.

And the same farmers would have known, as all farmers up to the mid-1950s have known, that cereal and pulses together do better on poor soil than cereals alone because of the nitrogen-fixing ability of the pulses, and if the pulse is faba bean, then also the support offered by the stronger bean stem.

Common sense tells that they would have grown mixtures but there is no definitive evidence.

Sources, references

[1] Mashlum – a traditional mix of oats and beans posed some questions about the crop grown as a sown mixture rather than a line intercrop.

[2] O’Brien DG. 1925. The Mashlum Crop. In: Farm Crops, edited by Paterson WM, pages 297-302, published by The Gresham Publishing Company, London.

[3] Crop census records for the main crops from early in the century to 1978 are available online as Agricultural Statistics Scotland from the Scottish Government web site at Historical Agricultural Statistics. Mashlum is sometimes included with other pulses and forages but is given as a separate crop for the period indicated in Fig. 1 above.

[4] DOST Dictionary of the Older Scottish Tongue cites the crop in the spelling mashloche from the 1440s at http://www.dsl.ac.uk/entry/dost/mashloche.

[5] Treasure ER, Church MJ (2017) Can’t find a pulse? Celtic bean (Vicia faba L.) in British prehistory, Environmental Archaeology, 22:2, 113-127, DOI: 10.1080/14614103.2016.1153769. An excellent paper on the occurrence of field bean in Britain.

[6] Jones J. (2009) Plant macrofossils. In Best J, A Late Bronze Age Pottery Production Site and Settlement at Foster’s Field, Tinney’s Lane, Sherborne, Dorset.  Archaeology Data Service 2009: idoi:10.5284/1000076. Many of the source papers on the topic are only available free to academic data services, but this one is available online through the link. 

ScoFu: the quest for an indigenous Scottish Tofu

Chantel Davies writes:

As a long-time vegetarian and fan of Asian food, particularly tofu, in recent years I have limited my consumption of soya due to the sustainability issues of soya production and potential negative impacts on health.

Beginnings

My inspiration grew from a Japanese anime series, ‘Yakitate!! Ja-pan’ (i.e ‘Freshly Baked!! Ja-pan’), which follows the adventures of the young protagonist, Kazuma Azuma, as he follows his passion to invent an authentic Japanese bread of which the Japanese people can be proud. In a similar vein, I have embarked on a quest to produce an authentic Scottish tofu, using local ingredients and some gastronomic daring.

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I acquired some faba bean powder (flour) from the Institute’s Pete Iannetta, who is growing beans in experimental fields at the Dundee site (and using them to create new bean-based products including craft beers).

My first experiment, ScoFu No. 1, was to test the production method and make some technical adjustments. It was marginally successful, but the quantity of final product after pressing resembled a crêpe with a lot of left-over okara (bean pulp). Not really what I was aiming for, though the okara could be used for faba bean falafel – an experiment I will save for another time.

ScoFu No. 2

For ScoFu No. 2, I increased the quantity of ingredients and modified the processes. Firstly, I produced the purée. After a bit of culinary alchemy, and a handy little tofu box, I managed to produce a very neat-looking block of tofu (image below).

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Block of ScoFu made from faba bean (Chantel Davies)

After a little more magical waving and muttering, the tofu became a delight of pan-fried strips, infused with chilli and garlic, served with spicy rice and a dash of soy sauce. The texture, although soft and crumbly, held together nicely when cutting and cooking.

The flavour was definitely faba bean, with a hint of bitterness due to the preparation method (and maybe the coagulant), but also a touch of umami; beany flavours are often preferred in East Asia. On a firmness scale of 1 to 5, with five being very firm, I would put this at 3.5, or ‘momen-dofu’ as the Japanese would say.

A rather delicious stock was produced in the formation of curds, which could form the base of type of miso soup, or vegetable stock.
Whilst this has been a success, there are so many different variables to consider when making tofu that can influence taste, texture and firmness that I feel my adventure has only just begun. Onward to ScoFu No.3!

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Stir fry with ScoFu (Chantel Davies)

Contacts, sources, links

Chantel Davies email: chantel.davies@hutton.ac.uk; c.davies@growing-research.com

The beans used to make the Scofu are locally grown faba beans Vicia faba. 

Also on the Living Field web:

Feel the Pulse – our exhibition on beans at Baxter Park with Dundee Science Centre and Legumes in the Living Field garden.

Related: SoScotchBonnet – our search for the truly indigenous crop.

[Published 27 June 2017; updated with new images 21 July]

Fixers 3 Crimson clover

Third in a series on nitrogen fixing legume plants.

The crimson clover Trifolium incarnatum ssp incarnatum was once grown widely in the south of Britain and trialled in the north, where it never found favour as a forage ley compared to the white and red clovers. So a small field of mixed legumes in Tarbat, a few miles south  of Portmahomack, was unusual.

Crimson clover was the most visible of the plants, in full flower late September, but the patch also contained red clover, two white- flowered clovers and a few other plants. On its margins a stray sainfoin appeared, probably a relic from a previous sowing.

lf_ntsmgs_mxdlgms1_gs_1100

Crimson clover was noted in Lawson & Son’s Vegetable Products of Scotland  (1852). They report that, if sown in autumn, it can be cut in June the next year ‘…. and the land fallowed for wheat or spring corn’.  They report that is makes a valuable green food for cattle and when cut in full flower ‘it makes a more abundant crop, and a superior hay to that of common clovers, at least it is more readily eaten by horses’.

They also report a comparison of ‘common crimson clover’, a variety of it named ‘late-flowering crimson clover’ sourced from Toulouse in France, and Moliner’s clover which was said to be grown in France and Switzerland. The late flowering variety came out top.

In modern taxonomy, the only one of these native to Britain is now called long-headed clover Trifolium incarnatum ssp molinerii, white-flowered, but that is found at only a few coastal sites in the south of Britain. This is likely to be the same as the Moliner’s clover mentioned by the Lawsons, but their seed was most likely sourced from European seedsmen rather than from the wild in Britain. Crimson clover is now Trifolium incarnatum  ssp incarnatum. Moliner’s and crimson are therefore considered sub-species (ssp) of the same species.

So what was it doing here? It was probably sown in a clover mix as a legume contribution to CAP Greening measures (see Sources). As can be seen the mix was luxuriant in foliage and flower well into autumn, when many other wild plants were dying or seeding.

Tarbat is a rich agricultural region, and you can see why the Picts farmed and established their monastery and unique monuments here  over 1000 years ago. Today, small fields and patches like the one shown offer refuge and food for  insects and birds in a landscape dominated by grazing land, and harvested or ploughed fields.

lf_ntsmgs_mxdlgmns2_gs_1100

Sources

Peter Lawson and Son. 1852. Synopsis of the vegetable products of Scotland. Edinburgh: Private Press of Peter Lawson and Son

Mixtures for CAP Greening and also crimson clover alone: Cotswold Seeds https://www.cotswoldseeds.com/seed-info/greening-and-cap-reform

Taxonomy from: Stace C. 1997. New flora of the British Isles 2nd Edition.

Links to legumes on this web site:

Contact: geoff.squire@hutton.ac.uk. Images are the property of the Living Field project.

Feel the pulse

With Dundee Science Centre, the James Hutton Institute is  contributing to a range of outreach activities in 2016 as part of The Crunch, and initiative headed by the UK-wide Association of Science and Discovery Centres and supported by the Wellcome trust.

Our exhibit at a community-run event in Baxter Park Dundee on 28 July 2016 was called – Feel the Pulse – a display of beans and peas, which along with lentils are known as ‘pulses’ (images below).

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Why pulses? They yield a highly nutritious, plant protein that can be grown without nitrogen fertiliser because the plants themselves fix nitrogen gas from the air into their own bodies. Nitrogen is essential for plant growth, but in its mineral form (from bags of fertiliser) can be a serious pollutant, contaminating streams and drinking water.

Once, peas and beans were widely grown and eaten, but the arrival of industrially made nitrogen fertiliser about 100 years ago and the ready import of plant protein from other countries caused pulses to decline as crops.

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Yet today, pulses are widely acclaimed for their benefits to health and the environment. The field bean Vicia faba crops above were grown locally without nitrogen fertiliser. They also offered a habitat and refuge for insects and small animals.

Is there a way to turn the tide – to farm more locally-grown cereal and legume produce, use less mineral N and support a cleaner environment.

We believe there is but one of the first things to do is to increase awareness of the benefits of peas and beans and similar products.

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Our exhibit – Feel the Pulse – shows some of the things that are being done, such as finding types of peas and beans suited to the local conditions, comparing the nutritional value of different pulses and finding new pulse-based products for the market, for example bean bread and bean beer, both made from field bean flour. 

Sources, links

Feel the pulse at Picnic in the Park, Baxter Park Dundee, 28 July 2016. Part of The Crunch at Dundee Science Centre.

Contact for pulses: pete.iannetta@hutton.ac.uk

At the event: Pete Iannetta, Philip White, Geoff Squire and Stephanie Frischie, a doctoral student visiting from the NASSTEC (Native Seeds) programme: www.nasstec.eu/home

See also: Bere and cricket

Macoto Murayama and T rep

T rep. The short form given by our field survey teams to white clover Trifolium repens. Still a common plant of pasture and waysides, so common that the intricacies of its structure and lf_noim_macoto1_gki1_350function generally go unnoticed.

Yet the mathematical artworks by Macoto Murayama shown in July at Dundee University reveal these intricacies in astonishing detail (image right).

The exhibition was held by courtesy of Frantic Gallery, Tokyo.

The Living Field’s correspondent gk-images sent some cellphone snaps from the exhibition. 

The introduction gives some detail of the artist and how he transfers the complex flowering heads and flowers of his botanical subjects to two-dimentional images.

“Macoto Murayama is a Japanese artist who cultivates ‘inorganic flora’. His extraordinary images are created after minutely dissecting real flowers and studying [them] under a microscope. His lf_noim_mctmryt_gki3_350drawings are then modelled in 3D imaging software then rendered into 2D compositions on photoshop before being printed on a large scale.”

Born in Kanagawa, Japan in 1984 he is now a researcher at Institute of Advanced Media and Art and Sciences, Tokyo.

The photographs, with reflections of lights and the opposite wall are of white clover (top) and spanish broom (lower).

Sources, links

Dundee University – Macoto Murayama: Growth and Form Exhibition. 14 May to 20 August 2016. Lamb Gallery, Tower Building, Dundee. Click the link for opening times.

Macoto Murayama at Frantic gallery: http://frantic.jp/en/artist/artist-murayama.html

Frantic Gallery Tokyo. Looks like some great exhibitions, for example the Universe and other Oddities by Zen Tainaka.

On Growth and form, a classic treatise by D’Arcy Thompson.  Web site http://www.darcythompson.org/about.html

Images Thanks to gk-images for the photographs shown here.

Ps Back to T. rep. There would be, in the 1940s, five or six legumes growing as ‘weeds’ in cornfields but they have since been ousted by nitrogen fertiliser and chemical herbicide. Trifolium repens is one of the the last remaining of these nitrogen fixers still found, but then rarely, in arable fields.