HKILA ’s Panel on Accredited Arborists

Title Name Academic & Professional Qualifications
Mr. CHAN Yuen King, Paul

TechArborA, Tree Risk Assessor (LANTRA)
Hon. Secretary Mr. CHOW Siu Hang, Paul

Tree Risk Assessor (LANTRA)
Panel Members Ms. CHIR, Yasmin BSci (Agr), MScEPHM, MLA, MBA
Mr. LAU Hing Tat, Patrick BLA, MUD
Mr. LO Shun Cheong BSc, MLA BSc, MLA
CA (ISA), Tree Risk Assessor (LANTRA)
Mr. SO Shui Shan, Isaac MA, MLA
External Advisors Mr. CHEUNG Yiu Kong, Lawrence BA, BLD, MA
MArborA, MCIHort, AA (HKILA)
Prof. CHIU Siu Wai BSc, Postgraduate Diploma, MPhil, PhD
Mr. HO Kin Chuen, John BEng
Prof. C Y Jim BA(HK), PhD(Reading),
CertHydrology(US Geol Survey),
MISoilSci, FArborA, CSci, BH, JP
Mr. SO Kwok Yin, Ken BSc(Arbor), BSc(A.Bio), MPHil
Mr. LAM Tak Chak BSc(Agri), MSc,MCIHort, MTCIA,
TechArborA, AA (HKILA)
Mr. WATT, James (Not Shown)
Dr. ZHANG Hao, Allen BA, MPhil, PhD
Secretariat Ms. Joanne Lam (


Tel.: 2896 2833     Email:

Background and Objective

For decades, members of the Hong Kong Institute of Landscape Architects (HKILA), incorporated under the Hong Kong Institute of Landscape Architects Incorporation Ordinance (Chapter 1162 of the Law of Hong Kong Law have been taking up the roles in landscape planning, landscape design, supervision of greening and landscaping works. We recognize the importance of ensuring proper tree management and supervision of landscape works being implemented in Hong Kong.

There is an increasing public concern on urban trees arising from improper pruning, interference and felling of some of them. Failures of sizable trees resulting in damages to properties and human lives were even more of a concern. Proper tree management and maintenance by well trained and qualified personnel are of vital importance in enabling the public to enjoy the benefits of urban greening. 

However, up to date, arboricultural practitioners in Hong Kong are not yet represented and regulated by any local organizations recognized by statutory instruments, nor are there any locally enforceable constitution, regulations, or Code of Conduct that bind their conduct and standard of service. From time to time, HKILA have received feedback from our members and the public that the standard of arboricultural services varied substantially, some being far from satisfactory. 

For the good of the industries general public, the HKILA set up a local accreditation system for the arboricultural industry. Such accreditation system will register a list of arboricultural practitioners that are assessed to have met stipulated minimum academic, professional and experience requirements. The list shall be made available to the public for their reference in procuring arboricultural services. We recognize a person on the accredited list should possess sufficient knowledge and experience to deliver reasonable arboricultural services. 

The Development of the HKILA Accredited Arborist Scheme (Formerly the Accredited Arboricultural Practitioner’s Scheme)

The Practice Committee and Public Affairs Committee of the HKILA jointly formed an Arboricultural Practitioners Accreditation Work Group in October 2010. This work group formulated and developed framework of the accreditation system, which was then endorsed by the Council of HKILA in July 2011. The HKILA Accredited Arboricultural Practitioners Vetting Panel (hereafter called the Panel) was subsequently formed in November 2011 to administer and implement the accreditation process. Through the initial membership referral scheme (referred as the first batch), the first batch of HKILA AAP was accredited and published on our website in July 2012.

The term “arboricultural practitioner” covers different levels of people in the industry including the managers, the supervisors, the workers. As the scheme developed it is clear that the level of requirements and assessments (as detailed in the Guidance Notes to Applicants and the Assessment Interview Syllabus) are targeting those at supervisory levels on tree management or landscape implementation on site. The Panel therefore recommended in June 2018 change of the title to Accredited Arborists, and subsequently endorsed by the Council of HKILA in July 2018. The Panel is also renamed as “Panel on Accredited Arborists”

Those successfully accredited are entitled to describe themselves as 'HKILA Accredited Arborist' and to use the abbreviated designation 'AA (HKILA)'. AA (HKILA) will be bound by the Code of Ethics and Conduct for Arboricultural Practitioners under the scheme and are eligible to become an Affiliate Member of the institute. Joining as a HKILA Affiliate Member is not mandatory and would have no effect on the renewal of accreditation status. Continuous Professional Development is a mandatory requirement for the renewal of accreditation. 

Application Open to Arboricultural Practitioners in Hong Kong

We have received positive feedback and support from the government and the local arboricultural industry on the HKILA Accredited Arborist Scheme. We are also aware of the urge from the construction industry for expanding the number of AA(HKILA) in order to cope with the increasing demand for qualified arboricultural personnel at supervision level.
To realize the objective of the HKILA Accredited Arborist Scheme, we are now inviting applications from eligible arboricultural practitioners for the AA(HKILA). 

Members List

List of Accredited Arborist (HKILA)
How to find an Accredited Arborist (HKILA)? 

Use of Titles

Applicant who pass the assessment is entitled to use below titles:
  • HKILA Accredited Arborist
  • Chinese: 香港園境師學會認可樹藝師
  • Initials: AA (HKILA)

Complaints of HKILA Accredited Arborist Disciplinary Offence

Where the Secretariat receives a complaint concerning a disciplinary offence, the Secretariat shall submit the facts to the Panel. The Panel may refer any complaint concerning a disciplinary offence to an Inquiry Committee, of not less than 3 members of the Panel, for decision.

The Inquiry Committee may, in deciding whether a person has committed a disciplinary offence, have regard to any Code of Ethics and Conduct or practice promulgated by the Panel or currently in use by the Institute.

The Inquiry Committee may advise the Secretary to remove the name of the Accredited Arborist (HKILA) from the accreditation list permanently or for such period as the Inquiry Committee may think fit.


Application Form of Accredited Arborist (HKILA).doc
Application Form of Accredited Arborist (HKILA).pdf

Accredited Arborist (HKILA) Assessment Interview Syllabus

Application Guide

Passing criteria / Flow of Interview / Site Rules and Conduct / Appeals

Passing Rate
Year Passing Rate
2012-2013 59%
2013-2014 23%
2014-2015 64%
2015-2016 38%
2017-2018 67%

Sample of New Certificate (since 2018)


Syllabus, Application Form and Tree List updated
The syllabus revised to suit local arborists practical knowledge needs. The species numbers of tree list has been increased from 80 to 100 to cover common native and exotic species for garden design, roadside trees, tree risk assessment and local woodlands.

More details on assessment flow, passing criteria and site conduct were updated.

Urban Forestry Seminar + Award Presentation for Accredited Arborists

Change of Titles
‘HKILA’s Panel on Accredited Arboricultural Practitioners’ changed to ‘HKILA’s Panel on Accredited Arborists’.

‘HKILA Accredited Arboricultural Practitioner’ changed to ‘HKILA Accredited Arborist’

新聞透視 樹木判官
18:19- 採訪HKILA AAP Panel及面見評估
(Assessment Interview) 過程 312726eec0

港大兩棵八十年的細葉榕被斬,理據基於一份具爭議的驗樹報告。報 告評定石牆樹有倒塌風險,一些樹藝師及環保人士則批評報告粗疏。 同類爭議已不是首次發生,究竟撰寫驗樹報告的樹藝師是誰?具備甚 麼專業資格?

跟園境師制度不同,香港並沒有樹藝師註冊制度,樹藝師資格由不同 國家的樹木學會認可,無論是考核方式、認可條件等,皆有不同。是 否所有樹藝師皆有資格當樹木判官?現行驗樹機制之下,出現了甚麼 流弊?


Formation of Inquiry Committee
Two arboricultural practitioners accredited under the HKILA’s AAP scheme, Sum Yu Hin (accreditation no. AAP018) and Mr. Lau Siu Yeung (accreditation no. AAP008) were charged by the Independent Commission Against Corruption (ICAC) with bribery of conspiracy for accepting illegal commissions.

Details of the case per press release from

Mr. Sum was pleaded guilty in the Eastern Magistracy on 7th July 2016, while Mr. Lau had his case adjourned to 28th July 2016.

This case has been brought to the attention of the HKILA Arboricultural Practitioner’s Accreditation Vetting Panel (the Panel or this Panel).

The subject of the offence is considered by this panel directly related to the duty of their works as arboricultural practitioners and in breach of the Code of Ethics and Conduct for Arboricultural Practitioners under HKILA Accredited List, in particular paragraph 3 and 6 under “code of conduct. This panel decided to suspend with immediate effect the accreditation status of Mr. Sum and Mr. Lau. An inquiry committee nominated by the Panel and appointed by HKILA Council is formulated to carry out an inquiry in the case, with the following personnel:

Mr. S C LO (vice-president of HKILA, member of HKILA AAP Vetting Panel) Mr. Paul CHOW (council member of HKILA, member of HKILA AAP Vetting Panel) Mr. Ken SO (external advisor of HKILA AAP Vetting Panel)

The inquiry committee is entrusted by HKILA to conduct proceedings and investigation, and provide recommendation to this Panel and HKILA council on the resolution. We shall announce the updates in due course.

Paul Chan
Chairman, HKILA AAP Vetting Panel 13 July 2016

Professional Diploma in Horticulture and Landscape Management (Thei)
The Professional Diploma in Horticulture and Landscape Management offered by Technological and Higher Education Institute of Hong Kong (Thei) is now available for admission with application deadline on 23 May 2015. For details, please refer to the Professional Diploma in Horticulture and Landscape Management.

Invitation of AAP Application
Second Batch of HKILA AAP is now open for application. The Application Form can be downloaded in the HKILA AAP webpage.

Application will be invited twice a year. If the application is found to be in order, the candidate will normally be notified of the result within 3 months from the closing date of application period.

Application period for this round is from 17 January to 28 March 2013 (according to the postmark date on the envelope).