Himalayan balsam, an ‘alien invader’, growing in the wildlife garden at Birdland
Following the news that homeowners who fail to control Japanese knotweed in their garden could face fines or ASBOs (anti-social behaviour orders), I thought it might be a good time to think about non-native plants. Now, I am definitely not suggesting that anyone should choose to grow Japanese knotweed, or allow it to spread further than it already has – it’s a problematic plant in the UK. But it’s easy to clump all non-native plants into the same category, when the reality is considerably more complicated.
My latest book, Jade Pearls and Alien Eyeballs, is all about unusual edible plants, and the people who grow them. It looks at some of the history of crop introductions from the ancient world right through to the modern, and explores some of the reasons why people might choose to grow something to eat that they wouldn’t expect to find in their local area. Towards the end of the book I touch on the debate about whether we should plant native or non-native plants, ending with the suggestion that “there’s a place for native plants in gardens, but it’s not the veg patch”. It’s a somewhat controversial suggestion, made for very good reasons. As the previous chapters of the book explain, most of what we find growing in our farms and gardens has made a very long journey to be there – our favourite foods are all native to somewhere, it’s true, but that’s not likely to be your local area. The UK, in particular, has rather a limited native flora, due to a history of being either covered in ice or cut off from the rest of the European continent by a body of water. So how do you determine whether a species is native? By its length of stay in a region, or how it arrived there? If you go back a few thousand years, all of the ecosystems on Earth would look substantially different….
Here’s another controversial suggestion – the whole native v non-native plants debate is pointless, because it misses the point. There are very few ecosystems left on the planet that could be said to be ‘natural’, in that they haven’t been disturbed by humankind. We should be taking care (or at least an interest in) which species we’re moving around the planet and why, but the basis on which we decide whether a species is useful or not changes over time. We’re not the only things moving species around the planet, and ecosystems aren’t static – they evolve as conditions change. The changes to the climate and ecosystem that our lifestyles are driving are likely to have much more of an impact on which species grow where than anything else we do.
‘Alien’ is not a synonym for ‘invasive’. Although some introduced species can take over, most are perfectly well-behaved. We don’t hear about those because they’re not causing any trouble. Money is spent on the control of invasive species, in some cases without scientific evidence that they’re causing harm. Although there are clearly some places where conservation matters, in many others ecosystems could be left to rebalance themselves.
In terms of wildlife, there are some animal and insect species that have very specific feeding habits, and rely on a particular plant, but most are more generalist and don’t distinguish between native and non-native plants (as anyone fending off pests in the vegetable garden will have noticed!). Although native species are good for wildlife, non-native species can be too – biodiversity is what we should be aiming for.
“Classifying biota according to their adherence to cultural standards of belonging, citizenship, fair play and morality does not advance our understanding of ecology” (Davis et al), which is a complicated way of saying that we have allowed ourselves to become prejudiced against all non-native species, rather than judging each one on its merits. When we’re choosing a new plant for the garden, we should put that bias to one side and make a decision based on which plants will thrive in the location we have available, which ones are unhappily invasive and which ones will deliver the benefits we’re looking for. Chances are, we’ll find ourselves with a happy mix of native and non-native species.
What do you think? Are you firmly on one side of the debate, or do you have a good mix of plants in your garden?
Davis, M. A., Chew, M. K., Hobbs, R. J., Lugo, A. E., Ewel, J. J., Vermeij, G. J., … & Briggs, J. C. (2011). Don’t judge species on their origins. Nature, 474(7350), 153-154.
Holmes, B. (2014) Loving the alien: A defence of non-native species. New Scientist, 2962, 54.
Posted in Blog on Nov 21, 2014 · ∞
Last modified on Nov 20, 2014
Today, for a change, I thought you might like a glimpse of the things that have appeared in my feed reader (Feedly) that have caught my eye and been saved to read later….
- Nature’s Poisons has been pondering how people come to eat poisonous plants, and advises you not to eat anything with death in its name. A perennially-useful reminder that not all plants are benign (but that taking reasonable precautions mean we don’t need to fear them).
- I follow From the Kitchen Of Olivia because she blogs recipes involving tea (my current obsession, in case you hadn’t noticed). Being from the UK, rather than the US, I’ve never had campfire S’mores, so I find this indoor recipe intriguing.
- Another foodie one, and a recipe that might come in handy for Christmas – DIY Cranberry Gin from the Telegraph.
- The Odd Pantry has been making chutney from sorrel leaves – a common name that really needs clarification as it is used for different plants in different parts of the world. In this case, Hibiscus sabdariffa, aka Roselle.
- Ethnobotanical Pursuits, based in America I believe, has been investigating Cinnamon vine or air potato, although naughtily the scientific name is not mentioned (it’s Dioscorea oppositifolia, or Dioscorea batatas). You can buy your own from Real Seeds if you want to give it a go.
- And Alys Fowler explains how to grow Mediterranean myrtle in our less than Mediterranean climate.
That should give you plenty to read and chew over :) What’s the most interesting article you’ve come across this week?
Posted in Blog on Nov 19, 2014 · ∞
Tags: food & ethnobotany.
Quite often, when I tell people that I’m an ethnobotanist (and explain what that means), they grin and joke that I must enjoy studying Cannabis. In fact, I have a pair of silver cannabis-leaf earrings that I sometimes wear as an ethnobotanist’s joke. But plant-based drugs are an interesting topic, so before we moved, Ryan and I took a day trip into London to visit Kew Gardens during their Intoxication Season – a celebration of mind-altering plants. Some of the species on display were familiar, and legal:
Tea and coffee both contain mind-altering caffeine
The display notes that tobacco could become a biofuel crop, and is being used to develop an experimental drug to combat the Ebola virus
Salvia divinorum is used by shamans to produce altered states of consciousness.
But most are illegal in at least some countries:
The cannabis plant was kept under lock(s) and key
As was the peyote cactus
Kew couldn’t obtain a license to have a real Coca plant, so visitors had to make do with an illustration
The Opium poppies had been harvested and dried. They’re legal to grow in the UK, but trying to turn them into drugs isn’t.
Intoxication Season, which focused on different types of plants over four weekends, was designed to inspire debate about mind-altering plants, society’s views on them and the choices we make as to which are legal and which are not. There’s a nice write-up over at New Scientist for those of you who would like to know more, and I can thoroughly recommend Mike Jay’s book on the topic, High Society: Mind-Altering Drugs in History and Culture, which is utterly fascinating.
Posted in Blog on Nov 12, 2014 · ∞
Last modified on Nov 12, 2014
Tags: ethnobotany & gardens.
Ethiopia is in the news today, remembering the famine of 30 years ago. Rather than dwell on the past, I thought I would share this upbeat video from Perennial Plate – celebrating Ethiopia’s food culture:
Ethiopia! from The Perennial Plate on Vimeo.
The description of the video on Vimeo says “We travelled to Ethiopia for two weeks and filmed the making of injera, false banana and coffee as well as everything else we saw. Please watch, enjoy and visit this amazing country!”
For those of you who are intrigued by the ‘false banana’, it’s Ensete ventricosum, also known as the Ethiopian banana, Abyssinian banana, or simply ensete. I found a nice article that explains how this multipurpose plant is turned into different foods – ensete doesn’t produce fruit, but has edible pseudostems (the ‘trunk’ is formed from tightly-packed, overlapping leaf sheaths).
Posted in Blog on Oct 23, 2014 · ∞
Tags: food & ethnobotany.
The Feedback section in the New Scientist last week (9th August 2014) was mostly devoted to the topic of toilet roll – having asked for figures on the annual consumption of this essential commodity, they have been regaled with anecdotes about the size of the army rations thereof, and differences in quality in different countries.
It’s not often that the topic of toilet roll comes up in gardening circles. There is occasional talk, perhaps, of the lack of toilet facilities on allotment sites, or the construction of composting toilets by an enterprising committee.
And, most springs, you can find yourself involved in a discussion on the use of toilet roll inner tubes for sowing individual seeds. They’re good for larger ones, like beans, and can be planted out whole to avoid root disturbance. It’s much easier to get your hands on them these days, as I’m told they’re no longer wanted for craft projects at nurseries and play schools, due to the perceived problem of contamination.
From an ethnobotanical perspective, it might also be interesting to explore the potential plant replacements for the job, should our choice of tissue become unavailable. Mullein frequently gets mentioned as being suitable for this purpose, and PFAF says that Brachyglottis repanda is also known as Bushman’s toilet paper. Knowledge of this kind is worth persuing in advance should you be an outdoorsy kind of person likely to find yourself caught short.
So… toilet roll and gardens. What are your thoughts? Would the truly self-sufficient grow their own toilet paper?
Posted in Blog on Aug 14, 2014 · ∞
I’m not a politician. I’m not a diplomat. I’m not an expert on foreign policy. It’s hard to watch what’s happening in Gaza and the West Bank with any equanimity; over 1300 Palestinians have been killed so far, including 315 children and and 166 women.
I believe that more unites us and divides us, and that’s certainly true of the people in Gaza. They are farmers, gardeners and foragers.
In 2008, a team of ethnobotanists from Palestine published a research paper entitled “Traditional knowledge of wild edible plants used in Palestine (Northern West Bank): a comparative study“. Traditional knowledge is a hot topic in ethnobotany, as our changing lifestyles mean that less and less of it is passed on to each generation. In most places in the world, the traditional uses of plants are being forgotten, and we are becoming more and more reliant on cultivated plants and agriculture.
The team found that, across 15 local communities in Palestine, locals were collecting 100 wild edible plant species, 76 of which were mentioned by 3 or more people. Those plants were distributed across 70 genera and 26 families. The most significant species were:
Some of those won’t be familiar to people outside of the Middle Eastern/ Mediterranean region. Others are. Fenugreek is on that list, as is wild mallow. Of the 100 wild species listed, some require very specific processing to remove toxins. I certainly wouldn’t rush to consume any members of the Arum family, and I’d be wary of consuming Cyclamen bulbs as well. This is where the traditional knowledge, and the Palestinian culture, combine. There are plenty of edible plants of the region that aren’t on the list, and no doubt some that are wouldn’t be considered edible in other places.
The Middle East is one of my areas of interest, because I enjoy the foods of those cultures. The Gaza Kitchen: A Palestinian Culinary Journey has been on my wish list for some time; I bought a copy yesterday when I read that 8 members of author Laila El-Haddad’s family had been killed in one night.
Flipping through it this afternoon, a recipe for chard and lentil stew caught my eye. The book says that “chard is used extensively in southern Palestinian cuisine.” Chard and leaf beet are two of my favourite plants – easy to grow and generous, endlessly versatile in the kitchen. Chard is also an attractive plant, that could just as easily fit in the flower border, with its colourful stems.
“Khobeiza or mallow grows wild all over Palestine”, the books says above a recipe for greens with dumplings. Or there’s purslane stew – known as rilja or baqla, purslane is a “succulent plant found growing through sidewalls and in abandoned lots all around the Mediterranean.”
There are recipes for broad beans, cauliflower, spinach and okra. The gardener in me wants to find a source of the short, stout, red carrots that are a “Middle Eastern variety with a long history”; substituting stumpy orange carrots just wouldn’t be the same.
I’m still waiting to hear when I can move into my new house (and the garden), but I already know there will be Palestinian plants in the garden next year, and Palestinian meals on the table. The Gaza Kitchen looks like a comprehensive guide to Palestinian cuisine, beginning by explaining the spice mixes and condiments, and moving on through salads and mezze, pulses and grains, vegetable stews, meats and seafood, preserves and conserves. Photos throughout give a taste of life in Gaza before the current crisis, as well as sections about farming and foraging there, with profiles of residents and explanations of ingredients and the cuisine itself. I am looking forward to reading it properly, and trying the recipes, but I can already recommend it if you’d like to know the region better through its food. You can also look out for Zaytoun‘s fair trade ingredients from Gaza, including olives and olive oil, za’atar, almonds and dates and cous cous.
There are farmers, gardeners and foragers in Israel, too. Of course there are – there is more that unites us, than divides us.
Posted in Blog on Aug 5, 2014 · ∞
Last modified on Aug 7, 2014
Tags: books & ethnobotany.
Loving this infographic from Chadwicks :)
For those of you without a magnifying glass, this is the link to their sources!
Posted in Blog on Jun 25, 2014 · ∞
Thirty years ago, Ethiopia’s Antsokia Valley was known as the “Valley of Death”. 15-20 people died every day, in the midst of the worst famine the world has ever seen. Ethiopia was in the midst of a drought, and Antsokia was a wasteland.
Today, the picture is much brighter. World Vision’s relief work in the region turned into a long term development effort. They provided local farmers with seeds, tools and livestock. They planted more than 22 million seedlings, may of which were fruit plants. They brought bee hives, training and new infrastructure: flour mills, veterinary clinics, roads and irrigation channels.
Traditional Ethiopian crops including sorghum and teff now grow here once again, but they are mixed with novel crops that bring multiple harvests every year. Mangoes, papayas and oranges hang from the trees, and are joined by bananas, sugar cane, tomatoes and cabbages in the fields. More productive agricultural techniques, such as organic fertilising and crop rotation, mean that over 99% of the children here are now classed as ‘adequately nourished’ by World Health Organization standards. Life here may not be easy, but the people in the Antsokia Valley can live without the feat of hunger.
Elsewhere in Africa, the outlook isn’t as rosy. World Vision’s Grow Hope campaign is bringing orange maize seeds to vulnerable people in Zambia. Although maize (sweetcorn, Zea mays) is a staple food for over a billion people in sub-Saharan Africa and Latin America, the varieties commonly grown are lacking micronutrients (vitamins and minerals), such as vitamin A, that are vital for health.
But maize is naturally high in genetic diversity, and varieties exist that are high in provitamin A (converted to vitamin A by the body when the maize is eaten). Conventional breeding has created Orange Maize – agricultural varieties that are naturally high in provitamin A.
A field of orange maize. Image credit: HarvestPlus Zambia Country Program
Look out for World Vision’s Grow Hope show gardens this summer – they’ll be at BBC Gardeners’ World Live from 12-15th June and RHS Hampton Court Palace Flower Show from 8-13th July. (If you’re lucky, you will already have seen their Chelsea show garden!)
And if you register for more information about the Grow Hope campaign, World Vision
will send you a free pack of Calendula (pot marigold) seeds and some freshly ground Ethiopian coffee as a thank you gift. And if you sign up via this special Grow Hope link, you’ll also be entered into a competition to win two tickets to the Hampton Court Flower Show!
Posted in Blog on Jun 10, 2014 · ∞
Last modified on Jun 10, 2014
Tags: competitions & ethnobotany.
Those of you who were keeping up with my virtual book tour for Jade Pearls and Alien Eyeballs can’t have failed to notice that I’m sporting a jaunty pith helmet in my author photos. I chose it because it is part of the quintessential wardrobe of the stereotypical ‘gentleman explorer’ of the late 19th and early 20th centuries. No self-respecting plant hunter would have ventured to the tropics without one. Although they have now gone out of fashion, I can confirm that they make great sun hats – shielding your eyes and keeping the sun off your head. They are light-weight and breathable. At least I now have something to wear to fancy dress parties and steampunk conventions.
But why is it called a pith helmet? Probably the first thing that springs to mind when you think of pith (if, indeed, you ever do) is the bitter white stuff you find between the juicy segments of citrus fruits. That’s actually their mesocarp (or albedo), a pale and spongy inner layer of the rind. It contains chemicals that are good for combating bruising, if you can choke it down. It’s interesting to note that the Buddha’s Hand citrus (Citrus medica var. sarcodactyl) consists only of pith covered in a highly-scented rind.
Botanically speaking, real pith is spongy parenchyma cells, used for the storage and transport of nutrients. In eudicots (plants whose seedlings have two leaves), pith is found in the centre of the stem. In monocots (plants like onions, with one-leaved seedlings) the pith extends into flowering stems and roots. In both cases it is encircled by the rings of xylem (which transports water) and phloem (which transports nutrients). Aren’t plant vascular systems fun?
Pith helmets (AKA topees) were originally made with pith, from an Indian swap plant called Sola (Aeschynomene aspera and some similar species). They were sometimes referred to as solar topees, and the ‘solar’ comes from Sola, rather than their sun-protection function.
It was around 1870 when the pith helmet became popular with military personnel in Europe’s tropical colonies. Although they have been particularly associated with the British and French empires, they were used by all of the European colonial powers of the time. They were adopted as civilian headgear, for both men and women, in the 1940s. Latterly they tended to be made from cork, which is more durable.
My pith helmet (which I bought, naturally, from Amazon – the department store home of the odd and unusual) is made from genuine pith, from trees in northern Vietnam. Apparently the Vietnamese learned the art of making pith helmets a hundred years ago, during the French occupation. It’s amazing that there’s still enough demand to keep them in business….
The Sola has edible flowers, and its tender leaves are used as a vegetable. Its pith has also been cut into small pieces, strung together to make ‘ear ornaments’. Or turned into dyed beads and made into garlands for decorating religious statues and newly-wed couples. The white, spongy “wood” can also be used for paper, fibre, artwork, handicrafts and artificial flowers.
It’s not the only plant with useful pith. That of the sago palm, processed to remove toxins, is an important food source in Melanesia and Micronesia (in the Pacific Ocean). And the scourge of all children subjected to school dinners, although personally I quite like it ;)
Posted in Blog on May 17, 2014 · ∞
Tags: books & ethnobotany.
Coconut: Nose to Tail from The Perennial Plate on Vimeo.
In Sri Lanka, the coconut is, in a sense, a source of life. Not only it is the main ingredient in most Sri Lankan dishes, but it also plays a major role in many non-culinary parts of every day life. Without the coconut, things in Sri Lanka would be very different. Filmmakers spent the day with a family of 8 on their modest coconut plantation outside of Negombo, to see what the coconut has to offer.
Posted in Blog on Apr 17, 2014 · ∞
Last modified on Apr 14, 2014