In line with its objectives, HAK has been involved in various activities, notable of which include:
- The Association has published proceedings of her workshop in hard copies and online
- The Association has at least 250 members and the number is growing steadily.
- The Association has held regular Annual General Meetings since inception.
- The Association publishes an international journal named the African Journal of Horticultural Science (ISSN 1998-9326).
- The Association has a five year strategic plan
- The Association has organized annual workshops successfully since 2000.
- HAK is affiliated to the International Society for Horticultural Sciences (ISHS) and it is the contact body to the International Society for Horticultural Sciences (ISHS) for Kenya.
- The Association was a joint organizer of the 1st All Africa Horticultural Congress held in Nairobi in 2009.
- The Association organized the 1st International Symposium on Ornamentals in Africa held in Nairobi in 2013.