Author Archives: Tom Turner

Corten steel garden planters

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Corten steel garden planters

Corten steel garden planters


Iron is the fourth most common element in the Earth’s crust and, by mass, the most common element. It is a wonderful material, famed for its strength and mystery. Iron oxides give soils their red and yellow hues. They are nature’s foil to the often-garish colours of flowers and vivid greens of foliage. But gardeners associate iron with one of their enemies (rust) and coat it with expensive paints. Instead, they should learn to love the rich colours of iron oxide on Corten Steel.

Wrought iron has a low carbon content. Mild steel has a higher carbon content. Cast iron has an even higher carbon content (above 2.1%). Corten steel (patented as Cor-Ten) is an alloy of mild steel with copper and chromium. It oxidises to create a protective outer layer which stops corosion: it rusts a little and rusts no more. One can therefore enjoy the beauty of the iron oxide without worrying about the rusting destroying the steel. Having all the tensile strengh of steel, Corten garden planters are completely frost resistent and impact resistent. Since they are not mass produced, they can be supplied to order (eg by Crinklecrankle.com in the UK).
See also: corten steel in garden and landscape design

MOER Green roofs: history, classification and naming

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Scandinavian Green Roof Institute at Malmo

Scandinavian Green Roof Institute at Malmo

This blog has often discussed green roofs and green roof typologies but they always need more consideration:

Green roofs c3500BC

Turf was the standard roofing material in Neolithic North Europe. You can still see this roofing technique in Norway and Iceland

Roof garden c1000BC

The most famous elevated garden in history, the Hanging Gardens of Babylon, may not have been on a roof. Nothing is known about the construction and they may have been ‘hanging’ on an embankment rather then a roof. But they were definitely used as a garden and the only illustration of this type of space is a carved tablet in the British Museum. This was a place for fruits and flowers and a place to walk in the cool of the evening

Roof gardens in the twentieth century

Cities were becoming much denser and much higher-rise, so people began making modern roof gardens. Corbusier proposed one in Paris and the landscape architect, Ralph Hancock, designed one for Derry and Toms, now called the Kensington Roof Garden

Green roofs in the twentieth century

People began to remember that ‘green stuff’ could also serve as a roof-covering material and then found many reasons for reviving the idea: water conservation, biodiversity, acoustics, insulation etc. This led to the making of what are called ‘extensive’ green roofs and, by way of contrast, roof ‘gardens’ came to be called ‘extensive’ green roofs. I think the terminology began in Germany.

Moer Roofs in the twenty-first century

The City of Malmö and the Scandinavian Green Roof institute established a 9000m3 green roof which is called the Augustenborg Botanical Roof Garden. It is a good project and, though the name suggests ‘a botanical garden on a roof’, the design objectives of the Malmö roof are broad: ‘environmental, economical, and to improve storm water management, health and aesthetics in our communities’. This type of roof needs a new name and we could base it on MOER technology: Multi-Objective Environmental Roofing (pronounced as ‘mower’, for irony). The roles of a broad spectrum Moer Roof would include: social use, aesthetic use, food production use (including aquaponics), water conservation, biodiversity, acoustics, insulation, energy generation, sustainability etc. The SGRA has a useful classification of green roof advantages and design objectives
Image courtesy i-sustain

Does Greenwich Park have the oldest avenue of trees in England?

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The most important avenue in Greenwich Park, because it is grass, not tarmac, and because it has so many ancient chestnuts, is blocked by a Royal Bin Store for the cafe (above left - also note the design of the picnic tables, and sigh). When the bin store is removed the view on the right will be revealed. Queen Elizabeth I was born in 1533 in the palace of Placentia, in Greenwich, and learned to ride a horse in the park (not in this avenue, which was not planted until 1660-1, possibly on the recommendation of John Evelyn).

The candidates for ‘oldest avenue of trees in England’ include:

  • The yew trees in Westbourne said to have been planted in 1544.
  • The Bucklebury Oaks, also known as The Queens’ Avenues, which may have been planted to commemorate a visit by Queen Elizabeth I as well as a later visit by Queen Anne
  • Joris Hoefnagel’s drawing of Nonsuch Palace makes it look as though a line of trees leads to the entrance and there was a similar feature is shown on reconstructions of the Palace of Beaulieu

But the ‘correct’ answer depends in the interpretation of the question:

  • the processional route at Stonehenge is often described as an avenue and probably passed through trees for some or all of its length. Other stone circles (eg Callanish) also had what are assumed to be processional routes, as did Egyptian and Mesopotamian temples
  • the word ‘avenue’ (from the French avenir) was not used in English until the mid-seventeenth century. A similar feature made before this date would probably have been called an alley (from the French aller)

So on a strict interpretation of the word ‘avenue’, the oldest avenue in England may be in Greenwich Park. The chestnut trees, which survive, were planted c1660 and John Evelyn, who is recorded in the OED as the first English author to use the word ‘avenue’, may have advised on the layout. He had an avenue, which does not survive, in his nearby garden (at Sayes Court in Deptford). The best-looking avenue of old trees in Greenwich Park runs north from a point near the intersection of the Great Cross Avenue with Blackheath Avenue. The view along this avenue was blocked a few years ago by the erection of a ‘hit-and-miss’ fence round an outdoor rubbish dump for the park cafe. It makes one think that the Royal Parks, who manage Greenwich, either have no knowledge of garden history or no interest in garden history. So one does not know whether to conclude ‘forgive them, Oh Lord, for they know not what they do’ or whether to conclude ‘forgive them, Oh Lord, for they know exactly what they do’. But I regard the positioning of this rubbish dump as unforgivable. When an airplane crashes, an accident investigation team is established. There is a need for a similar investigation of the Royal Parks Agency. The Commission of Enquiry should have plenipotentary powers to call for papers, to summon witnesses, to take evidence under oath and to make binding recommendations, if necessary for the future involvement of expert garden historians and landscape architects in decision making for the Royal Parks. How many managers of Royal Parks have qualifications in garden history? Are there any qualified garden historians on the agency’s payroll? Several excellent landscape architecture firms have given advice on Greenwich Park but, so far as I know, no trained designers or historians have had a role in the Greenwich Park management hierarchy. And it shows. Greenwich Park is to be closed for a month in 2012 for the Olympic Equestrian Events. Wouldn’t it be wonderful if the rubbish dump were removed as part of the Olympic legacy to Greenwich Park?

Cycling policy in Amsterdam and London

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With thanks to Christine for the link, I am delighted to extend the availability of this history of cycling in Holland. Britain had a Conservative Government at the time of the 1973 oil crisis, which is identified as the starting point for the Dutch cycling policy. The response of Heath’s government was pathetic. They (1) gave a few grants for 50mm of roof insulation (2) borrowed a lot of money to keep downt he price of fuel (3) did nothing whatsoever about cycling. Today we have a Mayor of London and a Prime Minister who are keen cyclists. Please can we do what the Dutch did after 1973. And please can the London Cycling Campaign stage some really good stunts. I would, for example, like to see Whitehall, The Mall, Trafalgar Square and Parliament Square CARPETED WITH PRONE CYCLISTS for the state opening of parliament. I’ll the there, sun, wind or rain.

Parliament square urban landscape redesign LCC

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London Cycling Campaign re-design of Parliament Square landscape

Congratulations to the London Cycling Campaign (LCC) for publishing a re-design of Parliament Square’s urban landscape, also discussed on this blog this last year (see The landscape architecture of Parliament Square, Westminster, London UK). My comments on the LCC design are:

  • it concentrates on traffic at the expense of other considerations
  • the urban design history of the space is crucial: it began as New Palace Yard. The Square was a nineteenth century addition
  • the future use of the space is also crucial: just creating a patch of grass is insufficiently ambitious
  • the LCC design proposals also lack ambition: the fountain is perfunctory and the roadworks are ugly

The LCC’s scheme opts for a ‘Trafalgar Square’ solution on the north and west sides of the square. It would be better to revert to the historic idea of a ‘palace yard’ in which paved space was shared between vehicles and pedestrians. This is now known as a ‘shared space’ and Exhibition Road is a good recent example. With regard to the future use of Parliament Square, it should be a place for the elected representatives of the people (MPs) to meet the people they represent and the people who are affected by their decisions (you, me, cyclists, drivers, visitors to London). The below maps show the evolution of New Palace Yard into the Parliament Square Traffic Gyratory

Climate change in London and the Thames Estuary

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Climate change in London and the Thames Estuary

The above chart, from the Museum of London, shows the pattern of climate change in the past  500,000 years. It does not have a vertical scale but I think mean temperatures were about ten degrees centigrade cooler at the Last Glacial Maximum (the last dip before the 50,000 years of global warming before the present). I am not a chart expert or a climate change expert but, to me, it looks as though a period of global cooling should be expected, whatever the consequences of man-made (anthropogenic) climate change.

Climate change has produced dramatic changes in the landscape of the Thames Valley