| Abelia | Royal Botanic Garden Edinburgh |
| Abies | Ardkinglas Woodland Garden
Batsford Arboretum
Bicton Park Gardens
National Arboretum, Castlewellan
Cragside
Crarae Gardens
Dawyck Botanic Garden
Drumlanrig Castle
Eastnor Castle
Exbury Gardens
Foxhill Arboretum
Glendoick Gardens
Hergest Croft Gardens
John F. Kennedy Arboretum
Mount Stewart
Mount Stuart Gardens
The Savill & Valley Gardens
Sheffield Park Garden
Wakehurst Place
Westonbirt Arboretum |
| Acacia | Abbotsbury Sub-Tropical Gardens
Tresco Abbey Gardens |
| Acer | Ardtornish Garden
Batsford Arboretum
Bodnant
National Arboretum, Castlewellan
Crarae Gardens
Dawyck Botanic Garden
The National Botanic Gardens, Glasnevin
Foxhill Arboretum
Glendoick Gardens
The Harcourt Arboretum
Hergest Croft Gardens
Houghall College Gardens
John F. Kennedy Arboretum
Ness Botanic Gardens
University of Leicester Botanic Garden
Mount Stewart
Mount Stuart Gardens
The Savill & Valley Gardens
Sheffield Park Garden
Wakehurst Place
Westonbirt Arboretum
Winkworth Arboretum
York Museum Gardens |
| Acer palmatum | Westonbirt Arboretum |
| Aconitum | Cruickshank Botanic Garden |
| Actaea | The Harris Garden |
| Actinidia | Bristol Zoological Gardens |
| Adiantum | Tatton Park |
| Aechmea | City of Liverpool Botanic Gardens |
| Aegilops | John Innes Institute
University of Bristol Botanic Garden |
| Aeonium | Trebah Garden Trust
Tresco Abbey Gardens |
| Aesculus | York Museum Gardens |
| Agapanthus | Bicton College Garden & Arboretum
Mount Stewart |
| Agave | Trebah Garden Trust |
| Alchemilla | Cambridge University Botanic Garden |
| Alnus | Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
Hergest Croft Gardens
Ness Botanic Gardens
The Savill & Valley Gardens |
| Aloe | Newhaven Botanic Garden
Tresco Abbey Gardens |
| Alstroemeria | Ness Botanic Gardens |
| Amelanchier | Sheffield Park Garden |
| Ampelopsis | Trelissick |
| Andromeda | Glenveagh Castle Gardens |
| Anemone | Cliveden |
| Aquilegia | Fletcher Moss Botanical Gardens |
| Araucaria | Castle Kennedy Gardens
Drumlanrig Castle
Eden Botanical Institute
Glendurgan Gardens
Mount Stuart Gardens |
| Arbutus | National Arboretum, Castlewellan
The National Botanic Gardens, Glasnevin |
| Arisaema | Royal Botanic Garden Edinburgh |
| Arthrotaxis | Crathes Castle Garden |
| Arundinaria | Carwinion
Picton Castle
Trebah Garden Trust |
| Asiatic Primula | Cluny House |
| Asplenium | Chelsea Physic Garden |
| Aster novi-belgii | City of Leeds Botanic Gardens |
| Asteranthera | Arduaine Garden
Royal Botanic Garden Edinburgh |
| Astilbe | Lakeland Horticultural Society, Holehird
Marwood Hill Gardens |
| Aubrieta | University of Leicester Botanic Garden |
| Aucuba | York Museum Gardens |
| Avena | John Innes Institute |
| Azalea | John F. Kennedy Arboretum
Lea Gardens
Pencarrow
Younger Botanic Garden, Benmore |
| Azara | Exeter University
Knightshayes Garden
Logan Botanic Garden
Mount Stuart Gardens
Picton Castle
Torosay Castle & Gardens
Trebah Garden Trust
Trelissick |
| Bamboos | Abbotsbury Sub-Tropical Gardens
The Harcourt Arboretum
Picton Castle |
| Bamboos (Subtropical) | Carwinion |
| Banksia | University of Bristol Botanic Garden |
| Barley | Scottish Crop Research Institute |
Begonia The National Botanic Gardens, Glasnevin
Glasgow Botanic Gardens |
| Begonia | City of Liverpool Botanic Gardens |
| Berberidopsis | Nymans Garden |
| Berberis | Crathes Castle Garden
Dawyck Botanic Garden
Royal Botanic Garden Edinburgh
Glendoick Gardens
Houghall College Gardens
John F. Kennedy Arboretum
Ness Botanic Gardens
St Andrews Botanic Garden |
| Bergenia | Cambridge University Botanic Garden
Royal Botanic Garden Edinburgh |
| Betula | Cambridge University Botanic Garden
Dawyck Botanic Garden
Glendoick Gardens
Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
Hergest Croft Gardens
Houghall College Gardens
John F. Kennedy Arboretum
Ness Botanic Gardens
The Savill & Valley Gardens
Sheffield Park Garden
Wakehurst Place
Westonbirt Arboretum
Younger Botanic Garden, Benmore |
| Bonsai | Birmingham Botanical Gardens & Glasshouses |
| Brachyglottis | Inverewe Garden |
| Brassica | Scottish Crop Research Institute |
| Buddleja | Paignton Zoological & Botanical Gardens |
| Cacti and succulents | Dyffryn Gardens |
| Calathea | City of Liverpool Botanic Gardens |
| Callistemon | Marwood Hill Gardens |
| Calluna | Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
Harlow Carr Botanical Gardens
Lakeland Horticultural Society, Holehird
Wakehurst Place
The Royal Horticultural Society's Garden Wisley |
| Camellia | Abbotsbury Sub-Tropical Gardens
Birr Castle
Bodnant
Caerhays Castle
Chyverton
Exbury Gardens
Glendurgan Gardens
The Harcourt Arboretum
Marwood Hill Gardens
Mount Edgecumbe Garden
Mount Stewart
Pencarrow
Picton Castle
The Savill & Valley Gardens
Sheffield Park Garden
Trebah Garden Trust
Tregrehan
Trelissick
Trewithen Gardens
Wentworth Castle Gardens |
| Caralluma | The Harris Garden |
| Cardiocrinum | Glendoick Gardens
Wakehurst Place |
| Carex | Cambridge University Botanic Garden |
| Carpinus | The Sir Harold Hillier Gardens and Arboretum |
| Carya | Eastnor Castle
The Savill & Valley Gardens |
| Caryopteris | Bristol Zoological Gardens |
| Cassiope | Branklyn Garden
Glendoick Gardens |
| Castanea | Sheffield Park Garden |
| Catalpa | Cliveden |
| Cattleya | Glasgow Botanic Gardens |
| Ceanothus | Knoll Gardens & Nursery |
| Cedrus | Eastnor Castle
Fota Arboretum & Gardens |
| Chamaecyparis | Bedgebury National Pinetum
John F. Kennedy Arboretum
University of Leicester Botanic Garden
Sheffield Park Garden
Wakehurst Place |
| Chamaecyparis lawsoniana | Bedgebury National Pinetum
University of Leicester Botanic Garden |
| Cinnamomum | Fota Arboretum & Gardens |
| Cissus | Trelissick
University of Bristol Botanic Garden |
| Cistus | Chelsea Physic Garden
Ness Botanic Gardens |
| Clematis | Crathes Castle Garden
Sissinghurst Castle Garden |
| Clethra | Glendoick Gardens
Marwood Hill Gardens |
| Climbing roses | Cragside
Nymans Garden |
| Codiaeum | City of Liverpool Botanic Gardens |
| Coffea | Eden Botanical Institute |
| Colchicum | Houghall College Gardens |
| Conifers | Abbotsbury Sub-Tropical Gardens
Ardkinglas Woodland Garden
Ardno House
Arduaine Garden
Bedgebury National Pinetum
Bicton Park Gardens
Birr Castle
Brodick Castle Garden
Cawdor Castle Gardens Estate
Chyverton
Cragside
Crarae Gardens
Dawyck Botanic Garden
The National Botanic Gardens, Glasnevin
Drumlanrig Castle
Eastnor Castle
Eden Botanical Institute
Effingham Hill Estate
Exeter University
Fota Arboretum & Gardens
Foxhill Arboretum
Glasgow Botanic Gardens
Glendurgan Gardens
Glenveagh Castle Gardens
The Harcourt Arboretum
Inverewe Garden
Knightshayes Garden
Ness Botanic Gardens
Mount Edgecumbe Garden
Mount Stuart Gardens
Muncaster
Nymans Garden
Pencarrow
Picton Castle
Swansea Botanic Garden
Torosay Castle & Gardens
Treborth Botanic Garden
Tregrehan
Younger Botanic Garden, Benmore |
| Conophytum | Newhaven Botanic Garden |
| Convallaria | Cliveden |
| Cordyline | National Arboretum, Castlewellan
Trebah Garden Trust |
| Cornus | Bodnant
The Sir Harold Hillier Gardens and Arboretum
The Royal Horticultural Society's Garden Rosemoor
Sheffield Park Garden
Torosay Castle & Gardens
Trebah Garden Trust
Westonbirt Arboretum |
| Corylus | Brogdale Horticultural Trust
The Sir Harold Hillier Gardens and Arboretum
Wye College, University of London |
| Cotoneaster | Dawyck Botanic Garden
Glendoick Gardens
The Sir Harold Hillier Gardens and Arboretum
John F. Kennedy Arboretum
Ness Botanic Gardens
St Andrews Botanic Garden |
| Crataegus laevigata | University of Hull Botanic & Experimental Garden |
| Crinodendron | Mount Stuart Gardens |
| Crinum | The National Botanic Gardens, Glasnevin |
| Crocus | Houghall College Gardens
The Royal Horticultural Society's Garden Wisley |
| Cryptogams | Dawyck Botanic Garden
Royal Botanic Garden Edinburgh |
| Cryptomeia | Bicton Park Gardens |
| Cryptomeria | National Arboretum, Castlewellan |
| Cunninghamia | Glendurgan Gardens |
| Cupressocyparis | Bedgebury National Pinetum
John F. Kennedy Arboretum |
| Cupressocyparis leylandii | Bedgebury National Pinetum
National Arboretum, Castlewellan
University of Dundee Botanic Garden |
| Cupressus | Houghall College Gardens
John F. Kennedy Arboretum |
| Cyathea | Logan Botanic Garden |
| Cyclamen | Knightshayes Garden
The Royal Horticultural Society's Garden Wisley |
| Cymbidium | Glasgow Botanic Gardens |
| Daboecia | The Royal Horticultural Society's Garden Wisley
Dyffryn Gardens |
| Dahlia | City of Leeds Botanic Gardens |
| Daphne | Ness Botanic Gardens |
| Davidia | Crathes Castle Garden |
| Decumaria | Trelissick |
| Delphinium | City of Leeds Botanic Gardens
Glasgow Botanic Gardens |
| Dendrobium | City of Liverpool Botanic Gardens
Crathes Castle Garden |
| Deutzia | City of Leeds Botanic Gardens |
| Dianella | Mount Stewart |
| Dianthus | Crathes Castle Garden |
| Diascia | Logan Botanic Garden |
| Dicksonia | Trebah Garden Trust |
| Diervilla | Sheffield Botanical Gardens |
| Digitalis | Fletcher Moss Botanical Gardens |
| Dracaena | City of Liverpool Botanic Gardens |
| Dracophyllum | National Arboretum, Castlewellan |
| Drosera | The Harris Garden |
| Dryopteris | Chelsea Physic Garden
Harlow Carr Botanical Gardens |
| Embothrium | Arduaine Garden
Bodnant
Castle Kennedy Gardens
Crarae Gardens
Mount Stuart Gardens |
| Encephalartos | The National Botanic Gardens, Glasnevin |
| Enkianthus | Glendoick Gardens |
| Ephedra | Cambridge University Botanic Garden |
| Epimedium | Ness Botanic Gardens
The Royal Horticultural Society's Garden Wisley |
| Eremopyrum | John Innes Institute |
| Erica | Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
Houghall College Gardens
Lakeland Horticultural Society, Holehird
Mount Stuart Gardens
Wakehurst Place
The Royal Horticultural Society's Garden Wisley |
| Erythronium | Cluny House
National Arboretum, Castlewellan |
| Escallonia | Glenveagh Castle Gardens |
| Ethnobotanical plants | Chelsea Physic Garden
National Arboretum, Castlewellan |
| Eucalyptus | Crarae Gardens
Inverewe Garden
John F. Kennedy Arboretum
Logan Botanic Garden
Marwood Hill Gardens
Mount Stewart
Mount Stuart Gardens
Mount Usher Gardens
Tresco Abbey Gardens |
| Eucryphia | Bodnant
Brodick Castle Garden
Castle Kennedy Gardens
National Arboretum, Castlewellan
Glenveagh Castle Gardens
Knightshayes Garden
Logan Botanic Garden
Marwood Hill Gardens
Mount Stuart Gardens
Mount Usher Gardens
Torosay Castle & Gardens
Younger Botanic Garden, Benmore |
| Euphorbia | Abbey Dore Court
Dyffryn Gardens
Glenveagh Castle Gardens
University of Oxford Botanic Garden |
| Faba bean (and related species) | Scottish Crop Research Institute |
| Fagus | Dawyck Botanic Garden
John F. Kennedy Arboretum
The Savill & Valley Gardens
Westonbirt Arboretum
York Museum Gardens |
| Fascicularia | University of Bristol Botanic Garden |
| Ferns (hardy) | Sizergh Castle |
| Fitzroya | Ardkinglas Woodland Garden
Glenveagh Castle Gardens |
| Forrest, George, collections | Caerhays Castle
Muncaster |
| Fragaria | Brogdale Horticultural Trust
Horticulture Research International
Wye College, University of London |
| Fraxinus | Dawyck Botanic Garden
Houghall College Gardens
John F. Kennedy Arboretum
Ness Botanic Gardens
Thorp Perrow Arboretum
Quinta Arboretum
Westonbirt Arboretum
York Museum Gardens |
| Fritillaria | Cambridge University Botanic Garden
University of Leicester Botanic Garden |
| Fuchsia | Mount Stewart |
| Galanthus | Houghall College Gardens
The Royal Horticultural Society's Garden Wisley |
| Garrya | The National Botanic Gardens, Glasnevin |
| Gaultheria | The Savill & Valley Gardens |
| Genista | Chilworth Botanic Garden |
| Geranium | Cambridge University Botanic Garden
Glenveagh Castle Gardens
Mount Stewart |
| Gevuina | Arduaine Garden
Fota Arboretum & Gardens
Trebah Garden Trust |
| Ginkgo | Abbotsbury Sub-Tropical Gardens |
| Grevillea | Pine Lodge Gardens |
| Griselinia | Mount Stewart |
| Gunnera | Logan Botanic Garden
Trebah Garden Trust |
| Gymnocalycium | Newhaven Botanic Garden |
| Halesia | Holker Hall |
| Hamamelis | Bodnant
The Harcourt Arboretum
The Sir Harold Hillier Gardens and Arboretum
The Savill & Valley Gardens
Winkworth Arboretum |
| Haworthia | Newhaven Botanic Garden |
| Heathers | Bicton Park Gardens
Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
The Royal Horticultural Society's Garden Wisley |
| Hebe | University of Bristol Botanic Garden
Wakehurst Place |
| Hedera | Houghall College Gardens
Ness Botanic Gardens
The Harris Garden |
| Hedychium | Bristol Zoological Gardens
Wakehurst Place |
| Helleborus | Ness Botanic Gardens |
| Hemerocallis | City of Leeds Botanic Gardens |
| Hesperis | University of Leicester Botanic Garden |
| Hibiscus | City of Liverpool Botanic Gardens |
| Hoheria | Abbotsbury Sub-Tropical Gardens
National Arboretum, Castlewellan
Mount Stewart |
| Hooker's rhododendrons | Castle Kennedy Gardens |
| Hordeum | John Innes Institute
Scottish Crop Research Institute
Lakeland Horticultural Society, Holehird |
| Hosta | City of Leeds Botanic Gardens |
| Humulus lupulus | Wye College, University of London |
| Hydrangea | Arduaine Garden
Lakeland Horticultural Society, Holehird
Mount Stewart
The Savill & Valley Gardens
Trebah Garden Trust
Trelissick |
| Hypericum | Harlow Carr Botanical Gardens
Wakehurst Place
The National Botanic Gardens, Glasnevin |
| Ilex | Hardwick Hall
John F. Kennedy Arboretum
Ness Botanic Gardens
The Royal Horticultural Society's Garden Rosemoor
The Savill & Valley Gardens
Sheffield Botanical Gardens
Westonbirt Arboretum
Winkworth Arboretum
York Museum Gardens |
| Inula | Tatton Park |
| Iris | Crathes Castle Garden
The Royal Horticultural Society's Garden Hyde Hall
Ness Botanic Gardens
The Harris Garden |
| Iris ensata | Marwood Hill Gardens
Thorp Perrow Arboretum |
| Juglans | The Savill & Valley Gardens |
| Juniperus | Bedgebury National Pinetum
Dawyck Botanic Garden |
| Kalmia | Glendoick Gardens |
| Kingdon-Ward collections. | Muncaster |
| Lantana | Bristol Zoological Gardens |
| Larix | Dawyck Botanic Garden |
| Lathyrus | Weaver's Cottage |
| Laurelia | Trebah Garden Trust |
| Lavandula | Cambridge University Botanic Garden
The Harris Garden |
| Leptospermum | Mount Stewart |
| Lereschia | The Harris Garden |
| Libertia | Arduaine Garden |
| Ligustrum | The Sir Harold Hillier Gardens and Arboretum |
| Lilium | Mount Stewart |
| Linum | Northern Ireland Horticultural and Plant Breeding Station |
| Liquidambar | The Savill & Valley Gardens |
| Liriodendron | Chatsworth House
Fota Arboretum & Gardens
Glendurgan Gardens |
| Lithocarpus | Caerhays Castle
The Sir Harold Hillier Gardens and Arboretum |
| Lloydia | Treborth Botanic Garden |
| Lomatia | Arduaine Garden
Trebah Garden Trust |
| Lonicera | Cambridge University Botanic Garden
Crathes Castle Garden
Royal Botanic Garden Edinburgh
St Andrews Botanic Garden
Westonbirt Arboretum |
| Ludlow collections | Cluny House |
| Luma | Ardno House
Mount Stuart Gardens
Picton Castle |
| Magnolia | Abbotsbury Sub-Tropical Gardens
Arduaine Garden
Batsford Arboretum
Birr Castle
Bodnant
Caerhays Castle
Castle Kennedy Gardens
Chyverton
Exbury Gardens
Fota Arboretum & Gardens
Glendoick Gardens
The Harcourt Arboretum
The Royal Horticultural Society's Garden Hyde Hall
Marwood Hill Gardens
The Savill & Valley Gardens
Sheffield Park Garden
Trebah Garden Trust
Trelissick
Trewithen Gardens
Wentworth Castle Gardens
Westonbirt Arboretum
Winkworth Arboretum |
| Mahonia | The Savill & Valley Gardens |
| Malmaison carnations | Crathes Castle Garden |
| Malus | Brogdale Horticultural Trust
Cambridge University Botanic Garden
Dyffryn Gardens
Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
The Royal Horticultural Society's Garden Hyde Hall
Trelissick
Westonbirt Arboretum
Wye College, University of London |
| Mammillaria | Newhaven Botanic Garden |
| Meconopsis | Branklyn Garden
Cluny House
Glendoick Gardens
Houghall College Gardens
Mount Stewart
Torosay Castle & Gardens |
| Mertensia | Cruickshank Botanic Garden |
| Mesembryanthemum | Tresco Abbey Gardens |
| Metasequoia | Dawyck Botanic Garden
Fota Arboretum & Gardens |
| Metrosideros | Tresco Abbey Gardens |
| Mitraria | Arduaine Garden |
| Myrtus | Mount Stuart Gardens
Torosay Castle & Gardens
Trebah Garden Trust |
| Narcissus | Greenbank Garden
The Royal Horticultural Society's Garden Hyde Hall
The Harris Garden
Scottish Crop Research Institute
Trelissick
Guy L. Wilson Daffodil Garden
The Royal Horticultural Society's Garden Wisley
York Museum Gardens |
| Nepenthes | The Harris Garden |
| Nonocharis | Cluny House |
| Nothofagus | Caerhays Castle
National Arboretum, Castlewellan
Chyverton
Crarae Gardens
Glendoick Gardens
Glenveagh Castle Gardens
Marwood Hill Gardens
Mount Usher Gardens
Wakehurst Place
Younger Botanic Garden, Benmore |
| Nyssa | Sheffield Park Garden
National Arboretum, Castlewellan |
| Olearia | Glenveagh Castle Gardens
Inverewe Garden
Mount Stewart
Torosay Castle & Gardens |
| Omphalodes | Cruickshank Botanic Garden |
| Orchidaceae | Glasgow Botanic Gardens |
| Orchids | Dyffryn Gardens |
| Ornithogalum | Bristol Zoological Gardens |
| Paeonia | Crathes Castle Garden
The National Botanic Gardens, Glasnevin
Hidcote Manor Garden
The Royal Horticultural Society's Garden Hyde Hall
University of Leicester Botanic Garden |
| Paphiopedilum | Bristol Zoological Gardens
Glasgow Botanic Gardens
City of Liverpool Botanic Gardens |
| Papuacedrus | Mount Edgecumbe Garden |
| Parthenocissus | Trelissick |
| Patagonula | The Harris Garden
University of Bristol Botanic Garden |
| Pelargonium | Chelsea Physic Garden
The National Botanic Gardens, Glasnevin
The Harris Garden |
| Penstemon | Dyffryn Gardens
Kingston Maurward Gardens |
| Pernettya | The Savill & Valley Gardens |
| Peromia | Glasgow Botanic Gardens |
| Phalaenopsis | Bristol Zoological Gardens |
| Philadelphus | Crathes Castle Garden |
| Phlox paniculata | City of Leeds Botanic Gardens |
| Phoenix | Fota Arboretum & Gardens
The Harris Garden |
| Phormium | Abbotsbury Sub-Tropical Gardens
Mount Stewart
Trebah Garden Trust
The Sir Harold Hillier Gardens and Arboretum |
| Photinia | Sheffield Park Garden
Trelissick |
| Phragmipedium | Glasgow Botanic Gardens |
| Phygelius | Knoll Gardens & Nursery |
| Phyllocladus | Glendurgan Gardens |
| Phyllostachys | Carwinion
Trebah Garden Trust |
| Picconia | Abbotsbury Sub-Tropical Gardens |
| Picea | Ardkinglas Woodland Garden
Batsford Arboretum
Bicton Park Gardens
Crarae Gardens
Dawyck Botanic Garden
Drumlanrig Castle
Eastnor Castle
Exbury Gardens
Glendoick Gardens
Hergest Croft Gardens
John F. Kennedy Arboretum
Mount Stuart Gardens
The Savill & Valley Gardens
Wakehurst Place
Westonbirt Arboretum |
| Pieris | Arduaine Garden
Glenveagh Castle Gardens
The Savill & Valley Gardens |
| Pileostegia | Trelissick |
| Pinus | Batsford Arboretum
Bicton Park Gardens
Chatsworth House
Cragside
Crarae Gardens
Dawyck Botanic Garden
The National Botanic Gardens, Glasnevin
Drumlanrig Castle
University of Dundee Botanic Garden
Eastnor Castle
Foxhill Arboretum
Glendoick Gardens
Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
Hergest Croft Gardens
The Sir Harold Hillier Gardens and Arboretum
Houghall College Gardens
John F. Kennedy Arboretum
Mount Stewart
Mount Stuart Gardens
Quinta Arboretum
The Savill & Valley Gardens
Sheffield Park Garden
Torosay Castle & Gardens
Wakehurst Place |
| Pisum | John Innes Institute |
| Pittosporum | Abbotsbury Sub-Tropical Gardens
Bicton College Garden & Arboretum
National Arboretum, Castlewellan
Mount Stewart |
| Platanus | Mottisfont Abbey Rose Garden |
| Podocarpus | Ardno House
Arduaine Garden
National Arboretum, Castlewellan
Foxhill Arboretum
Glendurgan Gardens
Glenveagh Castle Gardens
Mount Edgecumbe Garden
Mount Stuart Gardens
Picton Castle
Trebah Garden Trust |
| Polypodium | Harlow Carr Botanical Gardens |
| Polystichum | Lakeland Horticultural Society, Holehird |
| Potato | Scottish Crop Research Institute
The National Botanic Gardens, Glasnevin |
| Potentilla | Fletcher Moss Botanical Gardens |
| Primitive plants | University of Dundee Botanic Garden |
| Primula | Bristol Zoological Gardens
Cluny House
University of Durham Botanic Garden
Royal Botanic Garden Edinburgh
Exbury Gardens
Fletcher Moss Botanical Gardens
Glendoick Gardens
Houghall College Gardens
Ness Botanic Gardens
Torosay Castle & Gardens |
| Protea | University of Bristol Botanic Garden |
| Prumnopitys | Foxhill Arboretum |
| Prunus | Batsford Arboretum
Bicton Park Gardens
Brogdale Horticultural Trust
Cambridge University Botanic Garden
Dawyck Botanic Garden
Dyffryn Gardens
Horticulture Research International
John F. Kennedy Arboretum
Mount Stuart Gardens
Winkworth Arboretum
Wye College, University of London |
Pseudopanax National Arboretum, Castlewellan
| Mount Stewart
Ventnor Botanic Garden |
| Pseudotsuga | Bicton Park Gardens
Cragside
Drumlanrig Castle
Mount Stewart
Mount Stuart Gardens |
| Pterostyrax | Holker Hall |
| Pulmonaria | Ness Botanic Gardens |
| Puya | Tresco Abbey Gardens |
| Pyrus | Brogdale Horticultural Trust
Wye College, University of London
York Museum Gardens |
| Quercus | Abbotsbury Sub-Tropical Gardens
Batsford Arboretum
Cambridge University Botanic Garden
The National Botanic Gardens, Glasnevin
Hergest Croft Gardens
The Sir Harold Hillier Gardens and Arboretum
Houghall College Gardens
John F. Kennedy Arboretum
Thorp Perrow Arboretum
Quinta Arboretum
The Harris Garden
The Savill & Valley Gardens
Sheffield Park Garden
Wakehurst Place
Winkworth Arboretum |
| Regnellidium | University of Dundee Botanic Garden |
| Rheum | Harlow Carr Botanical Gardens
The Royal Horticultural Society's Garden Wisley |
| Rhodendron | Arduaine Garden |
| Rhododendron | Abbotsbury Sub-Tropical Gardens
Ardkinglas Woodland Garden
Ardno House
Ardtornish Garden
Birr Castle
Bodnant
Branklyn Garden
Brodick Castle Garden
Caerhays Castle
Castle Kennedy Gardens
National Arboretum, Castlewellan
Chatsworth House
Chyverton
Cragside
Crarae Gardens
Dawyck Botanic Garden
The National Botanic Gardens, Glasnevin
Drumlanrig Castle
Royal Botanic Garden Edinburgh
Exbury Gardens
Glendoick Gardens
Glendurgan Gardens
Glenveagh Castle Gardens
Hergest Croft Gardens
Holker Hall
Inverewe Garden
Isabella Plantation
John F. Kennedy Arboretum
Lakeland Horticultural Society, Holehird
Lea Gardens
Ness Botanic Gardens
Logan Botanic Garden
Mount Edgecumbe Garden
Mount Stewart
Mount Stuart Gardens
Muncaster
Pencarrow
Picton Castle
The Savill & Valley Gardens
Sheffield Park Garden
St Andrews Botanic Garden
Tatton Park
Torosay Castle & Gardens
Trebah Garden Trust
Trelissick
Trewithen Gardens
Wakehurst Place
Wentworth Castle Gardens
Winkworth Arboretum
Younger Botanic Garden, Benmore |
| Ribes | Brogdale Horticultural Trust
Cambridge University Botanic Garden
Royal Botanic Garden Edinburgh
Scottish Crop Research Institute
Wye College, University of London |
| Rock garden | Branklyn Garden |
| Rock Garden plants | Cruickshank Botanic Garden |
| Rodgersia | Royal Botanic Garden Edinburgh |
| Rosa | Cragside
Crathes Castle Garden
Dyffryn Gardens
Fletcher Moss Botanical Gardens
Hardwick Hall
The Royal Horticultural Society's Garden Hyde Hall
Mottisfont Abbey Rose Garden
Mount Stewart
Sissinghurst Castle Garden
York Museum Gardens |
| Roses, shrub, pre-1900 | Mottisfont Abbey Rose Garden |
| Rosmarinus | Cambridge University Botanic Garden
The Harris Garden |
| Rubus | Brogdale Horticultural Trust
Horticulture Research International
Scottish Crop Research Institute |
| Ruscus | Cambridge University Botanic Garden
The National Botanic Gardens, Glasnevin |
| Salix | Houghall College Gardens
Ness Botanic Gardens
Long Ashton Research Station
Westonbirt Arboretum
University of Bristol Botanic Garden |
| Salvia | Dyffryn Gardens
Kingston Maurward Gardens |
| Santolina | Ness Botanic Gardens |
| Sarcococca | Capel Manor College |
| Sarracenia | The Harris Garden |
| Sasa | Carwinion |
| Sato-Jakura (Japanese cherries) | Batsford Arboretum |
| Saxifraga | Cambridge University Botanic Garden |
| Scabiosa | Hardwick Hall |
| Schima | Trewithen Gardens |
| Scilla | Bath Botanic Garden |
| Secale | John Innes Institute |
| Sedum | Abbey Dore Court |
| Sempervivum | University of Bristol Botanic Garden |
| Sequoia | Bicton Park Gardens
Eastnor Castle
Fota Arboretum & Gardens |
| Sequoiadendron | Bicton Park Gardens
Drumlanrig Castle
Eastnor Castle
Fota Arboretum & Gardens
Sheffield Park Garden
Wakehurst Place |
| Sheriff collections | Cluny House |
| Sino-Himalayan | St Andrews Botanic Garden |
| Sinojackia | Holker Hall |
| Skimmia | National Arboretum, Castlewellan
University of Leicester Botanic Garden
Wakehurst Place |
| Slieve Donard plants | Belfast Botanic Gardens |
| Solanum | Northern Ireland Horticultural and Plant Breeding Station
Scottish Crop Research Institute |
| Sorbus | Ardtornish Garden
Batsford Arboretum
University of Bristol Botanic Garden
Cambridge University Botanic Garden
Crarae Gardens
Dawyck Botanic Garden
University of Durham Botanic Garden
Glendoick Gardens
Granada Arboretum (Jodrell Bank Science Centre & Arboretum)
Harlow Carr Botanical Gardens
Hergest Croft Gardens
Houghall College Gardens
John F. Kennedy Arboretum
The Savill & Valley Gardens
Sheffield Park Garden
Treborth Botanic Garden
Winkworth Arboretum
Younger Botanic Garden, Benmore |
| Sorbus (Aria and Micromeles groups) | Winkworth Arboretum |
| Sorbus Univ. | Ness Botanic Gardens |
| Spiraea | Dawyck Botanic Garden |
| Stewartia | Winkworth Arboretum |
| Styrax | Holker Hall
Winkworth Arboretum |
| Syringa | City of Leeds Botanic Gardens |
| Taiwania | Crathes Castle Garden |
| Taxodium | Sheffield Park Garden |
| Taxus | Bedgebury National Pinetum
Bicton Park Gardens
Crathes Castle Garden
Wakehurst Place
York Museum Gardens |
| Telopea | Wakehurst Place |
| Tetraclinis articulata | Bedgebury National Pinetum |
| Thalictrum | Crathes Castle Garden |
| Theobroma | The Harris Garden |
| Thuja | Ardkinglas Woodland Garden
Bedgebury National Pinetum |
| Tilia | Cambridge University Botanic Garden
Dawyck Botanic Garden
Hergest Croft Gardens
Houghall College Gardens
John F. Kennedy Arboretum
Thorp Perrow Arboretum
York Museum Gardens |
| Torreya | Fota Arboretum & Gardens |
| Trachycarpus | Trebah Garden Trust |
| Tree ferns | Glasgow Botanic Gardens |
| Trillium | Cluny House |
| Triticum | John Innes Institute
National Arboretum, Castlewellan |
| Tropaeolum | Fletcher Moss Botanical Gardens |
| Tropical fruits | Eden Botanical Institute |
| Tsuga | Dawyck Botanic Garden |
| Tulbaghia | Marwood Hill Gardens |
| Tulipa | Cambridge University Botanic Garden |
| Vaccinium | Brogdale Horticultural Trust
Sheffield Park Garden |
| Viburnum | Cambridge University Botanic Garden
Crathes Castle Garden
Glendoick Gardens
Hergest Croft Gardens
Houghall College Gardens
The Royal Horticultural Society's Garden Hyde Hall
Winkworth Arboretum |
| Vicia | John Innes Institute
Scottish Crop Research Institute |
| Vicieae | Chilworth Botanic Garden |
| Vines | Trelissick |
| Viola and Violetta | City of Leeds Botanic Gardens |
| Vitis | Brogdale Horticultural Trust
Trelissick |
| Vitis vinifera | Brogdale Horticultural Trust
Wye College, University of London |
| Weigela | Sheffield Botanical Gardens |
| Weinmannia | Logan Botanic Garden |
| Wheat | Scottish Crop Research Institute |
| Wild relatives of cultivated crops | Eden Botanical Institute |
| Wilson E. H. | Birmingham Botanical Gardens & Glasshouses
Caerhays Castle |
| Wisteria | Birr Castle |
| Zea | John Innes Institute |
| Zelkova | Hergest Croft Gardens |
