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  • Blogs

    1. The hornbeam (Carpinus betulus) in Catalonia

      This year we have planted 11 European hornbeams in the streets of Olot, Catalonia.


      planting of hornbeam as street tree in Olot, Catalonia


      After an initially good start, we saw the newly planted trees suffer during the extremely hot and dry summer. The trees showed different signs of stress in midsummer (wilting of leafs and leaf loss), which are of course not uncommon for freshly planted trees.


      leafs are wilting and turning brown in june


      The young trees haven’t had time to develop a proper root system after they have been taken out of the field in the nursery. Which makes it difficult for them to absorb enough water to sustain the leafs in the tree crown.


      primary roots have been cut in nursery to create rootball


      But it was not until we had seen the hornbeam in its natural habitat in Eastern Europe forests before we started to ask ourselves the question:

      Is the hornbeam a suitable tree for the landscape in Catalonia?


      hornbeam in Poland


      In order to answer this question we made a small study of its natural habitat and its preferences and compared this parameters to the situation in Catalonia.


      The hornbeam is native to central, eastern, and southern Europe, including southern England. It can also be found in Western Asia (source Wikipedia).


      map of the distribution in Europe (wikipedia)


      The map shows us that the hornbeam is not native in Spain, although it is in some countries nearby such as France and Italy. However the (small orange triangle)    in Catalonia means that the tree has been introduced and naturalized in this area.

      Natural habit

      The hornbeam prefers growing in a shade place with a moderate soil fertility and also moderate moisture. It likes growing in forests of oak and beech trees and is often found near the borders of the forests. It is also common in wet areas near rivers (source wikepedia, árboles de Europa, Margot y Roland Spohn)

      Most street trees have a lot of sun hours in Catalonia, due to the high sun elevation angle. During summer days there isn’t much shade for normal street trees. The soil fertility strongly varies in the different areas of Catalonia, however the fertility of the soil within a city is normally poor. Not only do the trees in cities have little soil available, but there also hardly isn’t any organic layer in the soil. The moisture level of the soil is low during summer. During hot periods in Catalonia the soil can even completely dry out.


      All together the conditions in Catalonia don’t seem to be favourable for the hornbeam. Some parameters can be improved, such as the soil fertility and the humidity by adding fertilizers or installing a water system. It also possible to plant the hornbeam in the shade of a high building, bridge or other high trees.

      Before planting the hornbeam it is recommendable to improve the soil condition by adding organic material. After the planting it is important to provide enough water until the roots are developed. We are going to continue monitoring the development of the planted Hornbeams in Olot and next year we can hopefully dedicate an new post to them.

      What is your experience with the hornbeam? Please let us know by writing a comment.



      leafs of the hornbeam


      this blog is an adaption from:


    2. Man has always had a direct link to the landscape, though that link, whilst it is always there, may not be in the form that it once was. Keeping with the wood pasture theme, which I am really enjoying learning about through books and journal articles, I thought we’d look at how the manner in which we approach the ecosystem has changed over the centuries (quite briefly). Of course, what is written below doesn’t stop just at wood pasture – it has cross-over to other ecosystems, where the reasons for interaction with the landscape have altered through space and, more pertinently, time.

      Historically, wood pastures were managed for economic purposes. The grazing of animals on grasslands containing trees (and the feeding of the livestock with cuttings from pollarded trees, and a tree’s fruit crop), such as cattle and pigs, was for the direct benefit of communities, who relied upon the produce of the livestock (milk, meat, and so on) in order to make a living, and to generally therefore survive. Of course, the wood pastures needed to be conserved, so that they did not disappear, due to over-grazing. In this sense, they were actively conserved (by replanting dying and dead trees, and limiting grazing intensity), though largely because, without actively conserving them, the livelihood of many tens of thousands of people would be challenged. A by-product of this conservation of wood pastures, for the benefits created from grazing livestock, was that the sites were very rich in biodiversity – birds, fungi, insects, and plants, for example. The complex mosaic of niches within the wood pasture, ranging from open and disturbed soils through to the (perhaps sizeable) groves surrounded by the mantle and fringe vegetation, meant that a large number of organisms could viably frequent the site. However, for all of the biodiversity present as a result of the careful management and conservation of wood pastures throughout history, biodiversity was not the reason for management – until recently.

      The shift, in Europe, probably begun when wood pasture became disliked (for hope of a better word), during the 19th-20th century (varies depending upon the country). Foresters wanted to maximise output from the trees (coppice – sometimes with standards), and farmers wanted to maximise agricultural output. Therefore, the two practices, initially married, were divorced from one another (somtimes farmers were forced to stop grazing their livestock in wood pasture!). Wood pastures were thus either cleared of trees entirely, or alowed to regenerate into forest. With this came a decline in the richness of biodiversity and, eventually, this loss of biodiversity caused a rather evident of panic amongst conservationists. Ironically, therefore, the rationale behind creating and maintaining wood pasture became largely ecologically-driven, in place of economically-driven (though, particularly in Spain and Romania, wood pastures remain, are these are generally economically viable). Regardless of reason however, the status of wood pastures essentially went full-circle.


      A fantastic wood pasture in Estonia. Source: Ideas for Sustainability.

      Of course, this new found love for wood pastures does not necessarily mean that they can ever exist in the manner in which they did before. First and foremost, wood pastures are extensively grazed, and thus, for operations to be self-supporting financially, they must cover large expanses of land (unless the wood pasture is maintained for subsistence purposes, or grants are provided as a means of financial support). As farmers in Europe are generally in ‘the game’ for profit (they must make a living), managing livestock in wood pastures is probably not going to be all too popular, as it’d probably signal a marked drop in profits and / or a marked increase in labour input (at least, initially). Scope does exist to harvest edible mycorrhizal mushrooms from the wood pasture, such as truffles, though this is a specialised pursuit that is far from the current farming status quo of Europe.

      Furthermore, European culture has changed. Gone are the days of communities being self-sufficient, and instead many Europeans now work a job (that they may even hate) and buy their food from the supermarket (or even order it online). Therefore, is there even the desire to re-introduce wood pastures, for anything other than ecological reasons, or to supply the market with a niche animal product (such as Iberian ham from the black Iberian pig, in the holm oak dehesas of Spain). With this change in culture there has also been a change in learning priorities, and unfortunately many today seem to be fixated with knowing pointless facts about sports teams and celebrities. Functional and practical knowledge is largely gone. As a consequence, the management of wood pastures will be left to an expert few, where knowledge has either been gained academically, or via being passed-down through the generations (usually limited to rural areas where grazing still takes place). However, as more people now live in cities than in rural areas, and this trend will likely continue as rural areas are swallowed up by urban sprawl, or people move into cities for economic reasons, this tradition of passing practical knowledge on and keeping up the family tradition of extensive livestock grazing within wood pasture may very well become ever more the stuff of legend.

      black iberian pig dehesa

      The black Iberian pig grazing amongst a landscape of holm oak, in a Spanish dehesa. Source: Andrew Petcher.

      Society is simply in a different place than it once was. For this reason, the conservation of wood pasture is to be far from mainstream. People are certainly aware of nature (of which wood pastures feature), though more and more awareness comes from watching on the television and less from direct experience, and with this comes a discord. There is less emotional and cultural attachment to nature, and as a result, less of an impetus to associate with nature. Why help with the recreation of wood pasture when you can watch about its conservation on television, utter some lamentations, and then switch the channel and soon relegate it to a mere memory? That’s even assuming people watch such programs, in large numbers, in the first place.

      This probably turned out far more dystopian than I ever intended for it to come out as, though hopefully this illustrates how social changes have led to landscape management changes, with specific focus upon wood pastures in Europe. This is obviously applicable to other landscape types as well, of course. The principle generally carries across.

      Source (of inspiration): Hartel, T. & Plieninger, T. (2014) The social and ecological dimensions of wood-pastures. In Hartel, T. & Plieninger, T. (eds.) European wood-pastures in transition: A social-ecological approach. UK: Earthscan.

    3. We have been splitting logs lately, the timber has been lying in the yard for a couple of years and now we want to get it converted into logs to finish seasoning indoors so we have been busy with the firewood processor. Looking at the pile of logs and thinking about selling it all next winter has led me to consider the best way to market and sell our produce.  Since Trading Standards and the Weights and Measures Act 1985 have little to say regarding firewood we are a bit in the dark when it comes to quantities, packaging and pricing. With most goods the law is quite clear and very strict with serious penalties for suppliers who sell goods in quantities or measures outside those prescribed in the Act. Firewood however is a bit of a mystery, I suspect that it falls under the category of solid fuel, but its hard to confirm if thats the case. However it is viewed officially it would appear that the market is wholly unregulated.


      Logs are sold in a variety of ways, here are a few of the most common:


      By weight; usually by the “ton” however this is almost never confirmed by any kind of weigh bridge ticket something which  is likely to be illegal as far as the weights and measures act goes as one thing they are strict on is selling by weight. There is however a fundamental problem for the consumer with buying timber by the ton, this is simply that the wetter the wood the more it weighs. So there is an obvious incentive for the supplier to sell unseasoned wet wood as this will significantly ‘up’ his margin, if he bothers to weigh it at all that is!  Supermarkets have been dicing with the same issue for years when it comes to meat, hanging the meat performs the same function as seasoning logs, it dries out a little and whilst the flavour may improve, and possibly the price per kilo, the lost moisture is lost profit since they bought the meat by weight in the first place. They have got around this problem by injecting the meat with “stuff” to bulk up its weight, and apparently this is ok with trading standards! This has gone on for years of course, in times gone by bakers used to be infamous for adulterating their flour with fillers such as bone meal, chalk, sawdust and even gypsum! Thankfully at the end of the 19th century laws were brought in to standardise what could be called flour, maybe its time they took a look at bacon! (all that white stuff that comes out as it fries is the supermarkets added filler).


      So back to logs, selling by weight simply encourages the supplier to sell wet wood, and wet wood is not good for burning, not only does it produce little heat but because it burns at a lower temperature the combustion is incomplete, so gaseous tar and soot condense in your flue potentially leading to chimney fires. It would perhaps be ok to buy logs by weight at a known moisture content as happens in the wood chip for biomass industry, but that rarely happens.


      By far the best way to buy firewood is by volume, this way you get what you pay for, they may still be wet, but 100 logs are still 100 logs wet or dry, so now the incentive is with the supplier to sell a quality product, assuming he wants to keep your business that is. So the next problem to arise is quantifying that volume, a cubic meter is a relatively common unit and should be the ideal but thats not always the case, which leads us to what is perhaps the most common way of selling logs…..


      The load. So what is a load of logs? Well, anything you want it to be really, and this is where the industry really needs some guidance from the government. The load could be a bulk bag, but these vary in size from 2 cubic meters down to less than 0.5, or it could be a vehicle of some sort, trailer, pickup, 4×4 or even a car boot. From the consumers perspective how are they to compare one ‘load’ with another, does the back of one suppliers transit van compare favourably with another’s trailer? Who knows?  The upshot is the poor consumer is left in the dark. With weights and measures regulations so strict on other industries, including coal and smokeless fuel, why is it that logs are still in the dark ages when it comes to consumer protection?


      The answer may lie in the fact that during the industrial revolution we abandoned wood as a fuel, only to re-discover it in the last 10 years or so, and when the laws on weights and measures were made firewood just wasn’t on the radar. But these days it is most definitely back as a serious contender in the fuel market, sales of wood burning stoves have soared thanks to the carbon neutral credentials of  burning wood over fossil fuels. (don’t get me started on the carbon credentials of imported eastern european logs though!)


      Its time for HM Government to wake up to the burgeoning market in firewood and apply a little common sense to the way in which our logs are sold. We could do with a standardised moisture content for firewood, so that customers can expect to be able to get a certain calorific value from their wood, at least if its advertised as ‘ready to burn’ anyway. Then theres the weight / volume issue, logs really should be sold by volume, and all prices should be advertised by the cubic meter, irrespective of the size of vessel used to deliver them. This way the consumer can confidently compare prices from one supplier to the next. We have found that selling by the cubic meter we loose out to other suppliers selling by the bulk bag, our £60 per m3 has less appeal than a £50 bulk bag even though that bag may only contain 0.6 cube, making it considerably dearer, what do we do, sell unseasoned wood in order to cut our prices further, or try and skimp on the amount we sell?. Sadly the lack of regulation is currently driving quality down as firewood producers engage in a race to the bottom to stay in the game.


      So if you agree with the views expressed above please share this article on Facebook with your local trading standards office, yes they all appear to have FB accounts! You could also share it with your MP. You never know we may end up with a fairer firewood market in the not to distant future.


      For some further reading here’s a helpful PDF from the Forestry Commission.

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    4. 'The hidden heath'
      David Humphries, trees management officer Hampstead Heath


      The following article is taken from a series looking at the hidden treasures to be found in London.
      Lonely Planet Magazine
      January 2012
      Words by Matt Bolton
      Main Photo Matt Munro



      David Humphries on Sandy Heath. His latest obsession is studying how fungi and trees cohabit.


      'You don't just stumble across this place,' says David Humphries a man whose excitement at clambering up the nearest trunk puts even the keenest five-year-old to shame. 'It's a place for locals only really. You'll be lucky to see two or three dog walkers a day here, unlike the rest of the park.' Here on Sandy Heath - a serene wooded Glen in the western section - there is a preternatural serenity. It's difficult to believe that this peace can be found just a couple of miles from the frantic tumult of the City, nor in an open space that attracts seven million visitors a year. 'In spring, when it's in full leaf,' says David, 'you can't hear anything except the rustle of leaves.'



      David has worked at the Heath since 1985 first joining as a sixteen year old apprentice. Despite being London bred, he says that he was never a city type, and was always drawn to a more rural lifestyle. The remarkable character of Hampstead Heath has allowed David to fulfil his dream.
      Unlike London's more sedate Royal Parks, the true mark of the wild remains in the Heath. Trees are allowed to grow in crooked angles or to fall to the floor, and dead stumps slowly rot (they are a vital habitat for insects and bats) while leaves are left to pile up and decompose. 'Some other parks are more sanitised, like a Victorian pleasure park, 'says David. 'Every leaf is cleaned away so people don't get their shoes dirty. On the Heath, we're more about leaving nature to its own devise.'




      A short walk from Sandy Heath are the ruins of Pitts garden, which once belonged to the 18th century prime minister, William Pitt the Elder. A red-brick arch is all that remains, incongruous amid the woodland. A huge Beech has sprung up beside it, the roots pushing the wall of the arch over to such a crazy angle that David had to insert a support frame to stop it keeling over- a quick intervention to satisfy both the historians and the naturalists. 



      Across the road is the Hill Garden, perhaps the greatest of all the heaths hidden treasures. The huge stately home had been turned in to luxury flats, but the long serpentine pergola walkway that winds its way above the grounds for a third of a mile is open to the public. It's stone path is lined with pillars that in spring are wound with wisteria and roses.
      'Spring is a time of natural noise. You can actually hear the sap rising,' says David. 'Summer is a time of buzz, the insects and crickets. And the winter is a time of dormancy and silence. That's my favourite time of the year , when the Heath feels at complete peace'


      The viaduct bridge was built in 1845 as part of a failed attempt to turn the Heath into private gardens. 



      Hampstead Heath, NW3



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