trees and shrubs

With herbaceous plants it is usually fairly obvious which plants are cultivated, and which are wild or feral. This isn't the case for trees, and to a lesser extent shrubs, particularly hedgerow shrubs.

Therefore I am introducing as a rule of thumb (not necessarily to be followed to the letter) that trees and shrubs wild enough to qualify for the Florula as those which are observed to be producing seedlings.

From today's travels, these include sycamore (Acer pseudoplatanus), Norway maple (Acer platanoides) and horse-chestnut (Aesculus hippocastaneum). To these should be added hawthorn (Crataegus monogyna) - I pulled up an unwanted sapling from my back garden a few days back.

Willows and cotoneasters also qualify on these grounds, but I have yet to identify the species involved.