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Happy New Year with the novel app Curio-xyz for trees!

January 3, 2018

Dear friends of Thai flora,

It has been a long time since I wrote a blog for Dokmai Dogma. I am busy teaching dendrology, tree physiology and tree pathology at our arborist classes at Sweden’s largest gardening school Hvilan Utbildning. Meanwhile I get reports from our beloved Dokmai Garden. Little seedlings have grown into big trees with flowers and fruits. Apparently the native red kapok trees (Bombax ceiba) have flowered, and also the peculiar South American Cannon Ball Tree (Couroupita guianensis).

Last year, a new app, Curio-xyz, was launched which I believe will be a valuable tool for monitoring and teaching about trees. The app pinpoints your location, and shows a Google satellite image of your surroundings. If somebody has done the job, there will be coloured dots on the trees nearby your position. Click such a dot, and the name of the tree will appear, sometimes even with photographs and stories. The app is free and adapted to cell phone and web. I have introduced this app as a tool when we teach dendrology and tagged over 800 trees and shrubs in our Swedish school garden. The nearby Swedish university arboretum SLU Alnarp has registered thousands of trees and shrubs with Curio-xyz, and the nearby city Malmö has registered about 100 000 thousand street trees. If you think that is impressive, check out New York, more than 600 000 trees registered!

Are there any trees tagged in Thailand? Yes, the first native Thai tree ever tagged with Curio-xyz, and one of the first in Asia at all, was Dokmai Garden’s giant forest mango (Mangifera caloneura). I could comfortably tag it sitting at my desk at my office here in Sweden. Looking at Dokmai Garden from space makes my heart beat, and I recognize many individual trees, close friends of mine. However, to make sure my memory does not fail me I need to return to the spot and make sure the position of every tree is correct. After all, Dokmai Garden contains over 1100 different plant species, and one can only tag larger shrubs and trees.

The biggest obstacle at the moment for the Thai tree lover is the database. You can not just write a scientific name, you need to select from a list to avoid an accumulation of misspelt names. The list for the northern temperate region is rapidly expanding, even containing cultivar names, but for the tropics the Irish group behind Curio-xyz is negotiating to use a reliable database with accurate and modern scientific names.

Meanwhile, as you can see if you search for Chiang Mai and select Hang Dong district, you will see a restricted number of tree species at Dokmai Garden which I recently added to the database. The inventors of this app are keen to serve the user and reply pretty fast to comments and suggestions, so try their chat service!

Being a novel technique, Curio-xyz is still under development. A drawback is that the Google satellite images are old, and they are taken at a time when the sky is clear, i.e. the dry season when monsoon trees such as teak have shed their leaves, making such trees somewhat difficult to distinguish. It should also be emphasized that the images are useful for parks, gardens and streets, while the canopy cover in a forest makes tagging of individual trees difficult.

Why would you need a name of a tree? Once you have the name, you can google anything you want to know about the tree, from tree care and diseases to anecdotes and ethnobotany. Before you have the international scientific name, the tree remains a mystery or a source of confusion and misunderstandings.

With Curio-xyz, I believe amateur gardeners will learn a lot about trees, and purchase new exciting trees, and professional arborists and park managers can keep track of their gardens, parks and streets, and easily involve new staff without spending years showing around.

When iTree is fully incorporated with Curio-xyz, and adapted to different climates and tree species of our planet, a user can calculate the value of individual trees, and even design a future tree planting to optimise the ecosystem services in a neighbourhood.

For Thailand, the tourist from overseas can finally get the names already at the resort garden, quenching a thirst for a deeper knowledge of this beautiful country.

Happy New Year 2018!

Eric Danell




Impressions of an arborist student

August 8, 2016

Dear readers of Dokmai Dogma,


The blog still has around 200 readers a day in spite of me nowadays working in Sweden. At present I teach about trees in the temperate zone which is why I have not added any new blogs to Dokmai Dogma. However, below are the personal impressions by a student of mine, who spent a few weeks in July at Dokmai Garden.

Cheers, Eric Danell


The thought about an apprenticeship abroad was planted by Dr. Eric Danell, who all of you know from earlier blogs. It was more or less one of the first things he brought up when we started our eduction to become arborists late August 2015. At Hvilan Utbildning AB in Sweden, where he is teaching nowadays and I am being educated, he mentioned the possibility to gain experience in a more exotic environment, more precisely: Dokmai Garden. I was totally surprised about me being the only one in my class actually flagging for having interest in the idea. Now I am looking back at a very giving experience. I mean, where do you have the possibility to work with so many different species? When will you have the possibility to do whatever you feel makes most sense? Sure, there were some challenges as well. I was offered housing in the traditional home of a beautiful Thai couple, but they did not speak English. Furthermore, physical labour in this climate is something you will have to get used to and work pace needs to be reduced substantially. You will have to drink liters of extra water during the day. Aggressive tree-ants will take any possibility they get to make your life miserable and so do mosquitos and other insects. However, you get used to all this rather soon, surprisingly enough.

The first thing you will notice when you walk around at Dokmai Garden is that all has been very well made. This is a place in which people invested without compromising on quality. The entrance with a spacious parking lot, the beautiful gates, the conference building, facilities for personal hygiene. The garden itself is an interesting collection of species that are asking to be touched. I mean: the garden is rather young, as much of the vegetation was planted only around 2009. The fact that over here all grows quite a bit faster than back in Sweden makes that there is an even stronger need for young trees to be trained. With a pruning saw and pruner to be preferred over machete, if I may choose. I was offered quite some suggestions about what I could do during my almost 3 week stay, but soon found that I would never be able to tick all the boxes. During the first days I lost myself in the teak and longan plantation, deadwooding and training each individual tree in this part of the garden. And as I thought it would be a great idea to work as efficiently as possible I simply continued pruning until I was completely done, after which I soon found that pulling branches more than one full day is actually far less fun, especially in this climate.

From then on I initiated smaller projects that I completely finished before moving on. 1 project being one tree, or a smaller group of trees. I did climb at the garden, but in many cases climbing simply is impossible due to tree-ants that will attack you altogether if they get a chance. Their bite is not dangerous, just painful. Though: I did find that climbing a Samanea saman (Rain tree) is at least as challenging as climbing an oak, as it has such a wide canopy, with the distinction that you feel far less certain about durability of branches when climbing unfamiliar tree species. But you take the opportunity you get to do some climbing and on the beautiful small sign next to the Gmelina arborea (Snapdragon tree) I read that durability of its wood is strong. I was taught that in Hopea odorata a dangerous female spirit is living that will haunt you if you would fell this species without monks having taken precautions. You can imagine I pruned this one with extra care! Furthermore, I promised myself to marry the one who smells like blossoming Plumeria obtusa everyday of the year, despite that fact that this one cannot be referred to as a collector’s item.

To anyone who is a student in arboriculture: can you please promise me to take the opportunity to gain an experience like this when offered?

Text and Photo: Adrian


Characteristic bark of Bombax ceiba.


Male flowers of Hura crepitans.


Red sap of the durable native timber tree Pterocarpus macrocarpus.


Not my friends…(red weaver ants).

Dokmai Garden revisited

July 27, 2015

Dear friends of Thai flora,

Due to an overwhelming workload in Sweden we have not had time for tropical Dokmai Dogma blogs. However, we paid a swift visit to Dokmai Garden in Chiang Mai this July, and so we wish to share some impressions.

We arrived in the midst of the El Niño drought, but since we have experienced such droughts before we were not worried, confident our selection of hardy plants would survive like last time. In fact we eventually received some 20 mm of rain, and in two days the landscape changed into a jade green, although teaks and other deciduous trees had already decided to shed their leaves. Flowering trees which normally display their beauty in the (normal) drought of April started flowering all over again (e.g. Delonix regia and Cassia fistula).

The garden was full of birds and butterflies, including the endangered golden birdwing butterfly. Neighbours had noticed this island of life too. Of course they wanted to know how to achieve such biodiversity. The answer has been hinted in Dokmai Dogma blogs before; establish a broad range of plant species providing shelter for birds, food for butterfly larvae, fruit, pollen and nectar, and stay away from fire and pesticides! We were also pleased to see that the quarry still contained water in spite of the drought, and there were still plenty of native fish, many of which have become quite large (e.g. giant gourami). During rainy La Niña years the quarry fills up, but Dokmai Garden is naturally drained so unlike the rice field areas around town we are never flooded.

In addition to the wild fauna, Dokmai Garden has new zebu cows, many white ducks and many more chicken including black-skinned (white-feathered) chicken. The sheep have become mutton, as they destroyed many plants, including treasured bananas.

To our great joy most of the orchids that were mounted in the trees until 2013 have survived and many are naturally reproducing. One example is the orchid Aerides multiflora, which never produced fruit until this year when we counted 57 capsules! This hints that the garden keeps evolving and attracting more species, including the elusive pollinator of this orchid.

Aerides multiflora fruits July 2015

Although we lost the Mediterranean plants which apparently needed Eric’s love and care, the native monsoon trees have grown rapidly. The payom, Shorea roxburghii, which has a valuable timber and is one of the best natural substrates when orchid seeds germinate, have grown to such an extent the five trees confused our orientation. They seem to have doubled their size in 18 months! The Benjamin fig, Ficus benjamina, has grown at an amazing speed too. A tiny seedling which originally  germinated on a log was fastened to a rock six years ago, and its roots dispersed to eventually create a giant claw grasping the rock. This strategy has worked very well because the current impression of this fig tree is that of liquid roots. They look like they were made of melted metal.

Ficus benjamina root July 2015

Ficus benjamina liquid root. DG July 2015

Another native fig that has left childhood is Ficus racemosa. For the first time in its life it produces impressive amounts of red fruits to the joy of birds, insects and humans:

Ficus racemosa fruit.72

The ebonies are getting taller too, and we had a bountiful crop of santol fruit (Sandoricum koetjape). We also admired the height and health of the little known native tree Protium serratum. Although we could see its edible fruits, they were still immature. Many more delicious and rare fruits are expected over the coming years. The local climate of the garden is much cooler today thanks to the unbroken canopy of the monsoon woodland in the southeast. Humans can no longer reach the lowest branches in many trees, and like proud parents we remember that in June 2006 this entire woodland was gathered as seedlings in the back of our car! The native but rare rosewood (Dalbergia oliveri) has also grown rapidly. We should strongly recommend planting this native and gorgeous tree in Chiang Mai. Not primarily because of its valuable and beautiful wood, but because it can resist drought and has blue blossom and a lovely foliage which is red when the buds burst.

The area surrounding Dokmai Garden is developing quickly, with new houses and a brand new gasoline station, café, convenient store open 24/7 and ATM about 2 km away. The transformation of the canal road into a four lane freeway will commence in 2017. Being 2 km away we can not hear the traffic, but still rapidly access civilization when needed. The canal road is already the main route between town and the Doi Inthanon national park, which we of course also visited during our short stay.

See ya!

Ketsanee Seehamongkol & Eric Danell

Kapok fruit July 2015.72

Harvest of Dokmai Garden kapok fruits (Ceiba pentandra) for filling of cushions

News from the 16th Flora of Thailand Conference

September 14, 2014

The 16th Flora of Thailand Conference was held at the Royal Botanic Gardens, Kew, earlier this week. The amount of new and important information is quite large, so I have prepared a series of blogs to treat one aspect at a time. If you wish to read the abstracts of the posters and talks then click here! Below is an introductory summary.

Kongkanda and Simpson

Dr Kongkanda Chayamarit from the Forest Herbarium, Bangkok, was dubbed ‘Mother of Thai Flora’ due to her determined leadership to get the manuscripts published. Indeed, during her time as executive editor the publishing rate has increased significantly. To the right is Dr David Simpson, Head of the herbarium at Kew and the host of the conference.

Some short facts about the Flora of Thailand project:

The project aims at listing and describing all wild and naturalized vascular plants in Thailand through a series of publications which can be ordered from the Forest Herbarium. The first issue was published in 1970, and up to date about half of Thailands 12050 vascular plant species have been treated. Dr Kongkanda who is the executive editor declared she set the deadline for the last issue to the year 2021. That means a significant increase in publication speed. Beware that another goal for 2020 is to assess all of Thailands flora to determine which species are endangered. The committee declared at the meeting they will go on with printed editions of the Flora, while the electronic versions, which many of us want, will have to wait.

Another fact is that when a specialist begins exploring a certain plant family, there are often entirely new species described. Dr David Middleton reported that in 2006 there were 161 species of Gesneriaceae known from Thailand, but this year (2014) he had reached 245, including several species new to science. A sad fact is that the forestry cover of Thailand has decreased from 53% in 1960 when the Flora of Thailand project was under planning, to 25% or less in 2014 depending on how you define a forest.

The conference talks were quite diverse, with e.g. honorary lectures by H.R.H. Princess Sirindhorn, historical treatments of the first botanists in Thailand (Arthur Francis George Kerr from Ireland and Carl Kurt Hosseus from Germany, active in the beginning of the 20th century), student and professor presentations on various plant families,  other floras under preparation (Vietnam, Himalaya, Malesia, Indochina), conservation efforts including my own report on the Orchid Ark, lichens, mosses and even physiology.

Sad more or less recent news were the reports of dead botanists such as Christian Puff and Kai Larsen, and bird watcher Tony Ball. We were also surprised to learn about cut funding for botanists worldwide. At Kew Gardens the staff will be cut by 25%, a striking blow for the world’s centre of botanical research. At the Queen Sirikit Botanic Gardens in Chiang Mai the budget for displays has also been cut, and at Copenhagen University orchidologist Dr Henrik Pedersen has been forced to step down 25%, essentially a 25% cut of his salary since a researcher can not work part-time.


H.R.H. Princess Sirindhorn gave a presentation on the historical botanical ties with Great Britain and Denmark, the plant lab established at the Royal Palace, the work on Dipterocarpus alatus from the northeast of Thailand, the school gardens and her own interest in the genus Durio.

Other more positive news were the plans for a worldwide flora on line, a portal accessing information from various sources to present all known plants on Earth, based on the Plant List and eMonocot. Other important web sources are a key to Parmeloid lichens of northern Thailand, Ferns of Thailand, Laos and Cambodia and Palms of Thailand.

The Forest Herbarium has also published a new revised version of the Rosetta Stone Thai Plant Names, and all speakers would receive a copy by mail, but by some reason this book would not be for sale.

A conference is not only a place for sharing results during official presentations, but also a place for brainstorms where people with similar interests can meet and exchange ideas. I sometimes think the most important collaborations and projects begin at pubs, coffee breaks or in washrooms. As to the orchids, this was a rare occasion where many devoted people could meet. The results of our talks and informal chats will be the theme of the next blog.

Eric Danell, grateful to Drs James Wearn and David Simpson for their generous support, and to Mr Vince from Bangkok who let me stay at his beautiful house in Chiswick.


The new revised edition of ‘Thai Plant Names’ was a dear surprise even to members of the Flora of Thailand committee!

Hogwarts for real

August 31, 2014

Dear friends of Thai flora,

I am still in Swedish exile but preparing for the 16th Flora of Thailand meeting in London next week.  To show the love for flora in Sweden, I wish to share some impressions from the arboretum at the university campus in Alnarp (Swedish University of Agricultural Sciences). To me, this is the main summer attraction in the Lund-Malmö region, yet virtually unknown to  foreign tourists.

Dokmai Garden benefactors Corien and Folbert Bronsema visited us and this adorable campus a few weeks ago. A striking feature is the castle, built of local yellow brick in 1862. It replaced a much older castle, used by the governors of the province Scania since the 17th century. However, this new castle was solely built to host students and teachers devoted at agricultural sciences, a ‘Hogwarts’ if you like. Today, the building hosts the Department of Landscape Architecture, Planning and Management. I use the arboretum in my spare-time as a destination for family picnics, and I take my arborist classes there for their teaching.

Building a castle in honour of science, knowledge and flora is such a rare event. However, at times benefactors, royalties and governments do contribute generously. It is important to keep this in mind when you feel like the loneliest person in the world, trying to raise awareness of minute endangered orchid species in remote jungles. My quest in London is to find partners with whom Dokmai Garden can collaborate to prevent extinction of Southeast Asian orchids. I foresee a network of Orchid Arks. The facts that Kew Gardens generously covered my registration fee, my current employer Hvilan Utbildning AB encourages me to attend as a part of my teaching position and Khun Vince from Bangkok let me stay at his house in Richmond are already promising signs of international collaboration…


Alnarp castle.72

Bruce Bebe, one of the permaculture founders, asked me to announce his upcoming course: Permaculture Design Course in Thailand 7-21 December 2014.

Eric Danell

Elite plants

May 26, 2014

Plant shopping in Chiang Mai is exciting, but the lack of scientific names and the high risk of buying unhealthy plants or plants unsuitable to the Chiang Mai monsoon climate can sometimes cause irritation. Here in Sweden,  the concept E-plant (elite plant) includes nursery plants with a guarantee:

1. A variety selected for Swedish climate.

2. A variety which has been tested at many Swedish places to give local advice.

3. Local production to ensure the plants are in phase with the current season.

4. Species and variety guaranteed and of course labeled with scientific names.

5. Healthy plants free from viruses and fungi.


Lately, woody e-plants are equipped with a microchip with a number which can be read with a certain device. The number of the chip can be used to look up the individual plant in a database, providing all the necessary information. A lost tag will no longer mean the information is lost. The technique is still novel, and it remains to find out how reliably the information can be read, and if the plant is damaged by the injection of the microchip.

The cost for an e-plant is about 10% higher than for ordinary plants.

Future will show if this is a clever step to ensure high quality, or if this is an unnecessary technology.

Text & Photo: Eric Danell

Sheep for sale!

May 3, 2014

Dokmai Garden has decided to sell the sheep after a seven months experiment. The sheep are perfect in a pen with grass, but wandering about in the precious botanical garden they cause a lot of trouble:

They uproot aluminium signs and bend them, 1200 Baht a piece. It seems green grass is their least preferred feed and so they rather focus on shoots, banana leaves, garbage and chicken feed. They have twice attacked the mirror image of themselves in the glass door of the shop with 15000 Baht in repair costs. The jew Bebe makes loud noises at night irritating the gardeners.

We reject the academic view that sheep are mainly grazers. These sheep are pronounced foragers.

While the mowing problem remains (pollution, costs, time and noise) we have decided to sell the sheep. Anyone with a pen or the intention of breeding sheep is most welcome to give the sheep a home before they turn into meat. Two rams (1 and 2 years old) and one ewe (5 years) remain. If you are interested in buying the flock, kindly leave a message below.

Knight and lion.Svaneholm

Sometimes a simple solution is not all that simple. Maybe the archaic scythe is the solution to the mowing problem? More contemplation is needed….