It is headquartered at the new Horticulture House[2] in Chilton, Oxfordshire, a half-mile east of the main large science park, and a conference centre.
The Garden Centre Association was formerly run at the HTA offices, but is now in Cheshire.
[3] The Association of Professional Landscapers (APL) is a division of the HTA formed in 1995, and is headquartered also at Horticulture House.
[4] It has around 1,500 garden retailers and manufacturers in its organisation, and is part of the AIPH.
[6] It runs the British Ornamental Plant Producers' (BOPP) Certification Scheme.