Five of the Best London Boroughs for Street Trees

From Hibiscus in Shoreditch, Golden Rain Trees in Osterley, and Bottlebrush trees in Pimlico, London has unexpected and fascinating street trees. Our urban forest, often under appreciated, is extremely varied and, what grows where differs around the city. So, which are the most interesting boroughs for a discerning London street tree admirer to visit, and why? Read on to find out about 5 London boroughs that, in no particular order, stand out…

1. Hackney

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Hipster Tree: Flowers of a Red Heart Hibiscus syriacus in trendy Shoreditch
Until about 20 years ago, Hackney was one of the less forested boroughs but around the turn of the millennium, it started catching up, and boy, did it catch up. Hackney now is a veritable arboretum: you can find streets lined with Kentucky Coffee Trees (Gymnocladus dioicus) in Clapton, Hibiscus (Hibiscus spp.) in Shoreditch, Wild Service Trees (Sorbus torminalis) in Stoke Newington and Scots Pines (Pinus sylvestris) in Dalston. The urban forest is relatively young here but what it lacks in maturity, it makes up for in diversity. There is something of interest at virtually every turn, and it will be exciting to see this part of town mature in the coming years.

2. Southwark

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Shard of Oak: Autumnal Red Oak (Quercus rubra) leaves in Southwark
Southwark is a big borough (by inner London standards), stretching from the southbank at London Bridge all the way east to Canada Water and south to Dulwich and Nunhead. Street tree planting is varied, and, like Hackney, you don’t have to go far to find something of interest. There’s a street of spectacular Yoshino cherries (Prunus x yedoensis) in Herne Hill, some of the biggest Tree of Heaven (Ailanthus altissima) specimens in London can be seen in Bermondsey and Magnolias (Magnolia spp.) are planted outside Borough Church. Southwark has pioneered some unlikely species too, including Persian Silk Trees (Albizia julibrissin) and, one of my favourites, the Strawberry tree (Arbutus unedo).

3. Hounslow

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Old Gold: A mature Golden Rain Tree in Chiswick
That long ribbon of a borough, Hounslow, has been planting great trees for years. It’s got everything, from stately Planes (Platanus x hispanica), classic Lime tree (Tilia x europaea) boulevards and landmark Cherry (Prunus spp.) avenues to being perhaps the best place to see mature Golden Rain Trees (Koelreuteria paniculata) in London. Of these elder statesmen, a tree right outside Osterley Tube station is an arboreal landmark, displaying beautiful coral pink new leaves in spring, yellow flowers in high summer, glorious autumn foliage and seed lanterns in the winter. There’s at least one tree in this borough playing host to Mistletoe too.

4. Islington

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My Cherie Amour: Lovely as a spring day, Bird Cherry in full flower, Islington
My home borough, so I might be a little biased, Islington is the part of town I know best. It’s the best borough for Caucasian Wingnuts (Pterocarya fraxinifolia), a fabulous spreading tree easily identified by tell-tale dangling clusters of little winged nuts, and is home to some other intriguing species. Islington was, of course, the first borough to plant Olive trees (Olea europaea) on the street – to reflect its Greek and Turkish communities perhaps? It is also home to some great Elm trees of various types including the Chinese Lacebark Elm (Ulmus parvifolia), the largest tree of this species in the country can be seen planted outside the Whittington Hospital. But perhaps what Islington is most noted for is ornamental fruit trees; dotted about the borough, the street tree aficionado can find rare pears (Pyrus spp.), notable Crab apples including plenty of Chonosukis (Malus tschonoskii), and unusual Yunnan Apples (M. yunnanensis). There’s also a good stock of flowering cherries including examples of the now rather out of fashion Bird Cherry (Prunus padus).

5. Westminster

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Frontline: Newly pollarded Plane trees separate Tate Britain from the Millbank Estate in Pimlico
Westminster plays host to the ‘Government Estate’, so has the job of keeping some of the most visited, filmed and photographed parts of the city looking green and pleasant. There are a lot of mature Plane trees in Westminster, as you might expect, adding to the grandeur of Whitehall and parts of the West End. But scratch the surface and you will find more interest around many corners. Westminster has pioneered the planting of Gingkos (Gingko biloba), a species well adapted to life in the busiest parts of town, and even in this most urban borough, English Oaks (Quercus robur) can be found outside Charing Cross and Pimlico stations. Perhaps the finest Mimosa (Acacia dealbata) to be found on the frontline can be seen in Pimlico and there’s even a street lined with Australian Bottlebrush trees (Callistemon citrinus)!

Stanfords

These trees and many more feature in my newly published book, London’s Street Trees and I shall be talking about the urban forest at Stanfords Map and Travel Bookshop in Covent Garden on June 5th. Please do join me!

 

 

Engaging people with trees through technology

Trees and technology are not, on the face of it, natural bedfellows. But I believe new technology can provide the trigger for people, especially young people, to become interested in what is around them. 

So, I’m very pleased to be part of a ‘Trees and Technology’ seminar during London Tree Week where I am sure this will be one of the hot topics. Other topics to be discussed are the Mayor’s street tree map, the data behind it, which is now in the public domain, surveying urban canopy cover from space, creating digital tree trails and how Internet of Things (IoT) technology can help monitor tree populations.

This event is part of the London Tree Week Lecture Series organised by the Mayor of London and the Woodland Trust. It takes place on Friday 2nd June, 2.30pm – 4.30pm at Convocation Hall, Church House, Westminster, London SW1P 3NZ

And it’s FREE!

So, to find out more and secure your place now visit the Woodland Trust’s website.

 

London’s Street Trees on the Map (well, most of them)

Some months ago I heard rumours about a London Street Tree map being prepared by the GLA at City Hall. Excitingly, that map is now live and has been for a couple of months. For those who haven’t yet poured over the fascinating insights into what trees can be found on London’s streets would be well advised to stop reading this and get over to the map now!

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Genus loci: The most common 22 tree types are mapped, and all the ‘Others’ are there too – they’re the brown dots…

Underlying the map interface there exists a vast database of information, no doubt hard won, wrestled from individual boroughs. Each borough is responsible for the trees on their patch and each has a team dedicated to their management. Perhaps not surprisingly then, each borough holds their own records for their part of the urban forest, and each borough uses different ways to gather and store this data, not to mention what data it actually harvests and holds. Therefore the feat of wrangling data from these various sources into a single dataset providing consistent information should not be underestimated – makes my brain hurt just thinking about it.

There are some black holes – for instance, Hackney and Haringey are two of seven boroughs that have yet to provide their data, but 25 of the 32 boroughs, plus the City of London and TfL have done and even with gaps, the potential of this map is becoming clear. Knowing what is planted on our streets is not only of interest to those who manage the tree inventory, this information can start to inform planning decisions, provide environmental insights and help shape policy to improve air quality. If there’s a correlation between levels of pollution and mature Plane Trees for instance, then this map could be a tool in that investigation right across the city. For me though, the most exciting possibility is the potential for public engagement.

The street tree data including location and species information is in the public domain and is released under an Open Government licence. It can therefore be used by third parties to exploit both commercially and non-commercially. And this is where the opportunities lie: imagine an app that can tell you what the tree is outside your front door, or the tree you walk past on your way to work? All possible with the data. Imagine walking up to a tree and discovering through your smart phone that it is a 150 year old Plane tree, it’s 33m tall and it’s one of 253,751 Plane trees in London, one of the most frequent trees in the city. This Plane tree stores CO2, soaks up pollution, moderates temperatures and has a financial value too. Imagine another app, this one educational, telling kids about all the minibeasts that make their home in an Oak tree outside their school or a Rowan tree on their street. It could tell them that an ancient pollarded Black Poplar tree in the local park was there long before the park and that it is a rare native tree that needs protecting. Another app could guide users on tree trails around Hampstead, Putney or wherever, it could allow the users to add comments about the trees on the trail, even add their own trail or check in at the Wembley Elm on Facebook.

And then of course there are more practical or nerdy applications, want to check out where all the Kentucky Coffee Trees are in London? Want to let your Local Authority know about the broken branch on a tree in your street? Want to see where the empty tree pits are? Want to get involved in community street tree maintenance?

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Big Apple: Every species is listed on the NYC map allowing users to easily locate their nearest Amur Corktree (Phellodendron amurense)

So, what do other cities do about mapping street trees? New York appears to be leading the way with their recently launched map. It is worth noting that New York is in a very different position to London in that one city-wide body manages the street trees ensuring the data wrangling issues faced in London just don’t exist, so they have the luxury of focusing on visualistaion and functionality. New York’s data is real time, users can register and once logged in, favourite individual trees and get involved with community street tree activities like planting and maintenance.

Melbourne’s map, like New York’s, allows users to zoom in almost to street level, but it only covers a relatively small area of the city centre. As reported in media around the world, users can email trees in Melbourne which while possibly a bit odd has clearly caught the imagination of many.

The London Street Tree map and especially the data underpinning it are tools that could help us understand, appreciate and value the trees in London which in turn could make our lives richer and healthier. I can’t wait to see it show all the street tree data, and with more detail too – exact species info would be great to see.

There’s Norway to Confuse a Maple

There are lots of maples, but the most commonly planted street trees are The Norwegian or Norway (Acer platanoides) and the Sycamore (acer pseudoplatanus), both are handsome species and at first glance difficult to tell apart. They have a lot in common, they are similar sizes and have similar native distribution.

Spiky Scandinavian: Norway maple leaves and flowers

The differences are subtle, Norway’s leaves are spikier than Sycamore’s, their flowers are produced in distinctive fresh green clusters before the leaves appear in spring, Sycamore on the other hand produces a long pendulous flower spike or panicle. Norway’s bark is lighter coloured and grooved, compared to the darker and scalier Sycamore.

The charms of large Maples are not lost on urban tree planters – the Norway Maple especially is a popular street tree – and nurserymen realised the merits of this species early on and set to work creating a myriad of varieties. Look out for Norway Maples of various leaf colour from gold through to deep purple, fastigiate and columnar trees and the inevitable variegated variety. Significant among these charms is Norway’s ability to cope with many soil types and it’s toleration of ‘hard surface’ urban situations where it may be exposed to extremes of temperature, air pollution and drought.

Suburban charms: Norway Maple flowering quietly in a North London street
Suburban charms: Norway Maple flowering quietly in a North London street

Despite the Norwegian soubriquet, Acer platanoides is native over much of Europe as far west as Belgium and France. If it wasn’t for post ice-age sea level rises, a few additional centuries of continental connection may have seen both species arriving in what is now eastern Britain under their own steam. As it is, the introduction of Sycamore is lost in the mists of time and records of Norway maple in cultivation date from 1683 (according to the BRC). No doubt practical and ornamental planting of Maples has played a part in their ‘invasive’ distribution, but, as the structure of our ancient woodlands testify, ever since we needed reliable timber supplies we have controlled tree planting.

Norway maples, like Sycamore, thrive and regenerate freely in our climate and I welcome them. Among the conservation community there is a view that both species should be weeded out but I believe this is flawed. In our age of massive human environmental intervention, extinction threats to common species like Ash as well as climate change, I think we need to embrace nearly-native, vigorous large tree species that may become important components in future woodlands.

Jog on: Autumn colours beginning to show on this young street tree
Jog on: Autumn colours beginning to show on this young street tree

You’re never far from a Norway Maple in London, here’s a row including a purple leafed variety near Finsbury Park station:

Olive and Kicking

I wonder what they were thinking, planting Olive trees on the streets of de Beauvoir Town and Pentonville? I like to think it is a nod to the glory days of 1980s Islington when media types slurped their way through tankers of new world Chardonnay accompanied by mountains of juicy olives.

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Extra virgin: Ripe fruit on an Islington street tree

Famed in tabloid imaginations for a pioneering fondness of continental gourmet goods, Islingtonians now have an opportunity to get with the small-batch artisanal craft food programme burgeoning in neighbouring Hackney. A locally produced olive crop could be the source of North London’s own cold-pressed lubricant or salty morsel – the uses of the fruit of Olea europaea are many and varied as the ancients could testify.

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A trailer loada trees: Stunted and twisted Olive trees arriving in Clerkenwell

Small but nevertheless fruit-bearing olive trees are to be found in several locations in the borough where they blend in seamlessly in these unlikely urban groves. The silvery evergreen foliage mirrors the au courant colour choices rocking the halls and doors of interiors from Clerkenwell to Canonbury.

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Singular estate: An Olive street tree graces a salubrious Pentonville Regency terrace

The Mediterranean exoticism of the olive is somewhat diminished by the ubiquitousness of hacked around trees used as props in restaurants and serviced offices. Nevertheless, the Olive tree is not to be overlooked – an attractive and extremely long-lived tree, it is a remarkable choice for a street tree, perhaps unique to Islington? Throughout my travels in Olive growing lands, I have never seen these trees lining streets in Greece, Italy or Spain.

Olives are inedible until they have been through a complex process of curing and fermenting so I am unable to report on the taste of the Islington fruit. But, while photographing trees recently, I witnessed a blackbird plucking a ripened olive from it’s branch, so they clearly do have some takers.


You can find the Islington groves here…

River Street, EC1:


Rotherfield Street, N1:

Tree Works or the Islington Pear Harvest

At this time of year I make frequent detours down St. John’s Villas, a residential turning off the Holloway Road, to see how the Pears are ripening.

These rare street trees and their fruit are pretty special – possibly unique. If you would like to read more, here’s something I prepared earlier.

Ripe and juicy: Time to pear off?
Ripe and juicy: Time to pear off?

This year, I’m pleased to report that the trees are abundantly laden, the pears growing fatter and juicier by the day, and so as the old Middlesex orchardist saying (might) go:

Pear dents in your bimmer
Christmas puddins’ll soon simmer

It looks like Islington are planning on picking the pears just as windfalls might start denting residents cars. I can only assume ‘Tree works’ (scheduled for 20th and 21st October) is a euphemism for Pear Harvest.

 Zone P? Picking Pears for Perry Production
Zone P? Picking Pears for Perry Production

It’s unclear what happens to the fruits once they have been picked, do residents produce Islington Pear Cider with them? Perhaps the council sells them to craft Perry producers or do they just go for composting?

In the meantime I’d like to think there will be a ceremony – a Pear Festival with Morris dancers and smock-wearing Islingtonians even, or at the very least an announcement less prosaic than ‘Tree Works’.


If you plan on helping the harvest, here’s where to go…

GPS coordinates: 51.5656, -0.1295; Latitude and Longitude: 51°33’56.0″N 0°07’46.2″W.

Google Street View:

Middle Eastern migrant adds sweet interest to London streets

Meet the ‘Bragania’ or Eriolobus trilobatus, a somewhat schizophrenic small tree found in the Levant, Anatolia and Thrace. The name Bragania hails from the Evros region of north east Greece, it’s more literal English names include Lebanese wild apple, erect crab apple or three-lobed apple tree. In Hebrew it’s called חֻזְרַר הַחֹרֶשׁ.

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Unassuming migrant: A young Eriolobus street tree in the safe haven of Islington North, fruits ripening nicely,

This refugee from troubled lands has arrived as a welcome and attractive migrant adding interest to London’s increasingly diverse urban forest.

Apparently the fruit is sweet and tasty, something to look forward to in October, right now in late September it is still green, I believe they will become golden yellow when ripe.

It’s rarity in the wild has translated into a confusion of names in English and possibly in the languages of its native lands – an arc of mountainous areas from northern Israel, through Lebanon, Syria, southern and western Turkey ending in a few isolated European pockets in Greece and one in Bulgaria.

It is found at altitudes of 1000m on Mount Lebanon in the Horsh Ehden (إهدن حرش) nature reserve, a remnant forest also home to the magnificent Cedar of Lebanon (Cedrus libani). In fact the Lebanese claim this refuge to be the last protected forest community of Eriolobus.

Further south, the tree is found in Israeli Upper Galilee and on the slopes of Mount Hermon in the Golan Heights.

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Street food: Greek Bragania trees have traditionally been safeguarded by local communities who value their fruit.

In scientific circles it’s known as Eriolobus trilobatus, and horticulturalists know it as Malus trilobata. It is the only species in the Eriolobus genus, but it vies for attention among well known and cultivated siblings in the Malus (apple) genus. One Greek academic paper explains the taxonomic history outlining previous classifications including as a Hawthorn or a Pear or even a Service Tree:

The taxonomic status of the species was rather ambiguous in the past as has been discussed by Browicz (1969), and the nomenclature chronologically included the following names: Crataegus trilobata Poir., Pyrus trilobata (Poir.) DC., Sorbus trilobata (Poir.) Heynh., Eriolobus trilobatus (Poir.) M. Roem., Cormus trilobata (Poir.) Decne. and Malus trilobata (Poir.) C.K. Schneid.

As well as the vagaries of botany, the Bragania is a tree that reflects the politics of disputed lands, the shifting sands of national and religious borders. These conditions may help protect it from harm, but may also cause it’s local demise where the pressure on land and resources becomes too much.

I hope it will be safe on the streets of London…

Leathery maple-like leaves of Eriolobus
Pome at last: The leathery maple-like leaves of Eriolobus

Links (all in English)


If you want to take a closer look at Eriolobus here’s where I found one.

GPS coordinates: 51.5704, -0.1219; Latitude and Longitude: 51°34’13.5″N 0°07’19.0″W.


Google Street View: