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Champion Trees
The glorious garden at Trewithen boasts 24 Champion Trees. These are trees that have been officially measured by the Tree Register and declared champions for either being the tallest of their type or for having the largest girth. Major gardens and parks throughout Britain and Ireland are inspected to update Champion Tree records - Trewithen's trees have been measured twice in the last five years.Of the 24 Champions, four are, unfortunately, completely inaccessible - although it is possible to see their canopy. The accessible 20 are clearly named and numbered on the garden guide and marked with an asterisk on their descriptive tags.
D=Deciduous E=Evergreen S=Semi
Evergreen
| | NAME | ORIGIN | CHAMPION BECAUSE... |
| 1 | Photinia prinophylla (E) | West China | height & diameter |
| 2 | Amomyrtus luma (E) | Chile | height & diameter |
| 3 | Acer cissifolium (D) | Japan | diameter |
| 4 | Acer laxiflorum (D) | West China | diameter |
| 5 | Reherodendron macrocarpum(D) | West China | height & diameter |
| 6 | Magnolia campbellii subsp.mollicomata(D) | South East Tibet | diameter |
| 7 | Rhododendron arboreum subsp.cinnamomeum(E) | North East India | height |
| 8 | Magnolia kobus(D) | Japan | diameter |
| 9 | Stewartia sinensis(D) | Central China | height |
| 10 | Ilex cyrtura(E) | South West China | height & diameter |
| 11 | Enkianthus chinensis(D) | West China | height & diameter |
| 12 | Magnolia campbellii ‘Charles Raffill’(D) | Kew Gardens | height |
| 13 | Acer laevigatum | China | only one of its stature |
| 14 | Magnolia campbellii subsp.mollicomata ‘Lanarth’(D) | Lanarth | largest of its type grown from a layer |
| 15 | Magnolia sargentiana(D) | West China | diameter |
| 16 | Magnolia sprengeri var.diva(D) | Caerhays Castle | diameter |
| 17 | Eucryphia cordifolia(E) | Chile | diameter |
| 18 | Schima wallichiivar.khasiana (E) | Assam in Burma | height & diameter |
| 19 | Schima wallichii subsp.moronhae var.superba (E) | Assam in Burma | diameter |
| 20 | Eucryphia moorei(E) | South East Australia | diameter |