The distinction between tree and shrub is not really clear, so a decision has been taken in compiling this list to include any species or hybrid growing to 5m (17ft) or more in height and thus capable of being trained as a tree under garden conditions.
- Acer campestre
- Alnus glutinosa
- Arbutus unedo (native in Ireland)
- Betula x aurata
- Betula x intermedia (some forms)
- Betula pendula
- Betula pubescens
- Buxus sempervirens
- Carpinus betulus
- Corylus avellana
- Crataegus laevigata
- Crataegus x media
- Crataegus monogyna
- Fagus sylvatica
- Frangula alnus
- Fraxinus excelsior
- Hippophae rhamnoides
- Ilex aquifolium
- Juniperus communis
- Malus sylvestris
- Pinus sylvestris
- Populus x canescens
- Populus nigra
- Populus tremula
- Prunus avium
- Prunus padus
- Prunus spinosa
- Pyrus cordata
- Quercus petraea
- Quercus robur
- Quercus x rosacea
- Rhamnus cathartica
- Salix alba
- Salix x alopecuroides
- Salix x calodendron
- Salix caprea
- Salix x capreola
- Salix cinerea
- Salix fragilis
- Salix x fruticosa
- Salix x latifolia
- Salix x lintonii
- Salix x meyeriana
- Salix x mollisima
- Salix x multinervis
- Salix pentandra
- Salix x pontederiana
- Salix purpurea
- Salix x reichardtii
- Salix x rubens
- Salix x rubra
- Salix x sericans
- Salix x smithiana
- Salix x stipularis
- Salix triandra
- Salix viminalis
- Sambucus nigra
- Sorbus aria
- Sorbus arranensis
- Sorbus aucuparia
- Sorbus bristoliensis
- Sorbus devoniensis
- Sorbus domestica
- Sorbus eminens
- Sorbus hibernica
- Sorbus lancastriensis
- Sorbus porrigentiformis
- Sorbus pseudofennica
- Sorbus rupicola
- Sorbus subcuneata
- Sorbus torminalis
- Sorbus x vagensis
- Sorbus vexans
- Sorbus wilmottiana
- Taxus baccata
- Tilia x europaea
- Tilia cordata
- Tilia platyphyllos
- Ulmus x elegantissima
- Ulmus glabra
- Ulmus x hollandica
- Ulmus minor
- Ulmus plotii
- Ulmus procera
- Ulmus x vegeta
- Ulmus x viminalis
The following are not native but have become naturalised:
- Acer pseudoplatanus
- Aesculus hippocastanum
- Amelanchier lamarckii
- Castanea sativa
- Ficus carica
- Juglans regia
- Laburnum alpinum
- Laburnum anagyroides
- Larix decidua
- Mespilus germanica
- Prunus cerasifera
- Quercus ilex
- Rhododendron ponticum