As of 1 April 2025 Trees and Shrubs Online contains nearly 15,000 individual articles on woody plants hardy in the northern temperate zones, illustrated by over 23,500 images. Over half these articles represent brand new text specially commissioned for Trees and Shrubs Online; these articles comprise the accounts of the nearly 150 genera listed below that we have revised in full to date. The remainder of the articles are derived from the Eighth Edition of Bean’s Trees and Shrubs Hardy in the British Isles (1976–81) together with the Supplement (1988) and from New Trees: Recent Introductions to Cultivation (2009); these will be updated as funding becomes available.
The following list identifies the major groups that have been fully updated so far. It is updated whenever a new account is published: