- To advance the education of the public by the provision and maintenance of an arboretum containing National collections of birch (Betula) and alder (Alnus) and by researching Birch and Alder and associated organisms in order to share knowledge and increase the scientific understanding of the genera.
- To promote the conservation, protection and improvement of the physical and natural environment, in particular by:
- the preservation of rare and endangered species contained within the arboretum;
- promoting the cultivation and distribution of Birch and Alder trees in order to create greater awareness of the environmental benefits of planting trees, creating new wildlife habitats and increase biodiversity.
- preserving the Ashburner Arboretum for its merit as an example of innovative (naturalistic) and outstanding landscape design.
- To advance education of the public in the understanding and appreciation of the arts and garden design by organising exhibitions, events and encouraging high standards of arts.