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Top five performers on clay:

When planting on heavy clay soil it is always advisable to attempt some improvement of the soil, by working in organic matter. Mulching the surface of the soil will also help improve the texture.

• One of these materials is long manure (manure that still has a proportion of visible straw remaining) or composted bark
• Finer grades of composted bark, leafmould, leaf litter, garden compost or mushroom compost will still have a beneficial effect, but to a lesser extent
• Dig coarse grit into the soil profile is often recommended, but the quantity required to have a beneficial effect makes this an impractical solution on all but the smallest scale
• When planting on clay soils, the bottom of the planting hole should be broken up before planting and the sides of the hole broken down using a garden fork. If not loosened, a sump may be formed in that water can collect, resulting in probable plant death from waterlogging
• It is a good idea to delay planting on heavy clay soils until late winter or early spring, when there is less time for dormant roots to become waterlogged and cold
• Mulch the base of the plants in spring with a 7.5cm (3in) layer of well-rotted organic matter which will help to retain moisture and suppress weed growth. Leave a gap of 7.5cm (3in) between the stems and the mulch to decrease the chance of rots developing at the base. Continually maintaining this mulch will gradually improve the soil profile
• Freezing and thawing over winter of ground dug in October aids soil breakdown and helps to form spring seedbeds

Trees

Acer japonicum 'Aconitifolium' AGM A. palmatum 'Inabashidare' AGM (Japanese maple)
Aesculus parviflora AGM
Amelanchier 'RJ Hilton' AGM
Betula pendula – Native to GB and Ireland
Betula utilis subsp. jacquemontii 'Silver Shadow' AGM (birch)
Crataegus laevigata 'Crimson Cloud' AGM – Cultivar of native to GB and Ireland, C. persimilis prunifolia AGM (hawthorn)
Eucalyptus gunnii ' France Bleu' ('Rengun')PBR ), Eucalyptus pauciflora subsp niphophila AGM
Fagus sylvatica AGM – Native to GB and Ireland
Ilex aquifolium AGM – Native to GB and Ireland
Ilex aquifolium 'Argentea Variegata' AGM – Cultivar of native to GB and Ireland
Laburnum × watereri 'Vossii' AGM
Liquidambar styriciflua Worplesdon ' AGM
Malus atrosanguinea 'Gorgeous' AGM, Malus 'Evereste' AGM(crab apple)
Prunus avium 'Plena' AGM – Cultivar of native to GB and Ireland
Prunus 'Shirotae' AGM
Prunus spinosa – Native to GB and Ireland
Pyrus salicifolia 'Pendula' AGM (weeping pear)
Sorbus aria 'Lutescens' AGM – Cultivar of native to GB and Ireland
Sorbus 'Olympic Flame' AGM, Sorbus pseudohupehensis AGM

Conifers

Abies koreana 'Horstmann's Silberlocke' AGM
Chamaecyparis lawsoniana 'Ellwoods Gold' AGM, C. obtusa 'Nana Gracilis' AGM, C. pisifera 'Boulevard' AGM
Ginkgo biloba 'Saratoga' (m) AGM
Juniperus chinensis 'Pyramidalis' AGM, J .× pfitzeriana 'Old Gold' AGM
Picea abies 'Little Gem' AGM, P. glauca var. albertina 'Conica' AGM, P. omorika AGM, P. pungens (Glauca Group) 'Hoopsii' AGM
Taxodium distichum , Taxodium sempervirens AGM
Taxus baccata AGM – Native to GB and Ireland
Taxus baccata ‘F²¹²õ³Ù¾±²µ¾±²¹³Ù²¹â€™ – Cultivar of native to GB and Ireland
Thuja plicata 'Atrovirens' AGM

Shrubs

Abelia × grandiflora 'Francis Mason' AGM
Andromeda polifolia ‘Blue Ice’ – Cultivar of native to GB and Ireland
Berberis (evergreen and deciduous), Berberis x irwinii 'Corallina Compacta' AGM, Berberis thunbergii 'Admiration' AGM
Buddleja × weyeriana'Bicolor' , B. 'Royal Red' AGM, B. 'Black Knight' AGM
Calluna vulgaris – Native to GB and Ireland
Calluna vulgaris 'Dark Star' AGM – Cultivar of native to GB and Ireland
Ceratostigma plumbaginoides AGM
Cornus sanguinea 'Anny's Winter Orange' – Cultivar of native to GB and Ireland
Cotoneaster (evergreen and deciduous), Cotoneaster × watereri 'Cornubia ' AGM, Cotoneaster dammeri 'Juliet' AGM
Escallonia (evergreen), Escallonia 'Iveyi' AGM, Escallonia 'Apple Blossom' AGM
Euonymus europaeus – Cultivar of Native to GB and Ireland
Euonymus europaeus ‘Red Cascade’ – Cultivar of native to GB and Ireland
Fuchsia magallanica 'Tricolor' AGM, F. Madame Cornélissen' AGM
Helianthemum nummularium – Native to GB and Ireland
Hibiscus syriacus 'Oiseau Bleu' AGM
Hydrangea macrophylla 'Blaumeise' (Teller Series) AGM
Mahonia × media 'Winter Sun' AGM
Osmanthus × burkwoodii AGM
Philadelphus 'Snowbelle' , Philadelphus × lemoinei 'Belle Etoile' AGM
Potentilla fruticosa 'Bellissima' – Cultivar of native to GB and Ireland
Rosa
Sambucus nigra – Native to GB and Ireland
Sarcococca hookeriana var. digyna 'Purple Stem' AGM
Spiraea × bulmada 'Goldflame'
Viburnum (deciduous and evergreen), Including Viburnum opulus ‘R´Ç²õ±ð³Ü³¾â€™ AGM – Native to GB and Ireland, Viburnum plicatum f. tomentosum 'Kilimanjaro Sunrise' (Jww5PBR) , V. × hillieri 'Winton' AGM
Weigela florida 'Wine and Roses' AGM, W. 'Red Prince' AGM

Ground-covering plants

Ajuga reptans 'Black Scallop' – Cultivar of native to GB and Ireland
Ajuga reptans 'Catlin's Giant' AGM – Cultivar of native to GB and Ireland
Arisarum proboscideum
Bergenia 'Overture' , B . 'Bressingham White' AGM
Bistorta affinis 'Darjeeling Red' AGM, B . vacciniifolia AGM
Bistorta officinalis ‘S³Ü±è±ð°ù²ú²¹â€™ AGM – Cultivar of native to GB and Ireland
Erigeron karvinskianus AGM
Euonymus fortunei 'Wolong Ghost' AGM, E. 'Emerald Gaiety' AGM
Galium odoratum – Native to GB and Ireland
Geranium sanguineum – Native to GB and Ireland
Gaultheria procumbens AGM (acid soil)
Geranium 'Orion' AGM, G. × cantabrigiense 'Ingwersen' AGM
Hypericum calycinum
Juniperus communis 'Green Carpet' AGM – Cultivar of native to GB and Ireland, Juniperus horizontalis 'Golden Carpet' AGM
Lamium maculatum 'Beacon Silver'
Persicaria microcephela 'Purple Fantasy'
Vinca minor 'Atropurpurea' AGM – Cultivar of native to GB and Ireland – Archaeophyte
Vinca major 'Variegata' AGM, Vinca minor 'Bowles's Variety' AGM – Cultivar of native to GB and Ireland - Archaeophyte

Climbers and wall shrubs

Campsis × tagliabuana 'Madame Galen' AGM
Chaenomeles speciosa 'Moerloosei' AGM (pink) and 'Nivalis' (white)
C. lacteus AGM
Forsythia suspensa
Escallonia 'Crimson Spire AGM, E. 'Donard Radiance' AGM
Garrya elliptica 'James Roof' AGM
Hedera helix – Native to GB and Ireland
Hedera helix 'Glacier' AGM (v) – Cultivar of native to GB and Ireland
Hedera hibernica – Native to GB and Ireland
Humulus lupulus 'Aureus' – Cultivar of native to GB
Hydrangea anomala subsp. petiolaris AGM
Kerria japonica 'Golden Guinea' AGM
Lathyrus sylvestris – Native to GB
Lonicera japonica 'Hall's Prolific' AGM, L. periclymenum 'Late Red' – Cultivar of native to GB and Ireland
Lonicera periclymenum 'Graham Thomas' AGM – Cultivar of native to GB and Ireland
Lonicera periclymenum 'Serotina' AGM – Cultivar of native to GB and Ireland
Pyracantha 'Saphyr Orange' (Cadange) AGM
RosaRosmarinus officinalis ' Foxtail' AGM
Salvia microphylla ' Cerro Potosi' AGM

Herbaceous perennials

Alchemilla mollis AGM, Alchemilla erythropoda AGM
Amsonia tabernaemontana var. salicifolia
Anemone hupehensis var.japonica 'Pamina' AGM, A × hybrida 'Andrea Atkinson'
Astilbe 'Bronce Elegans' AGM
Astrantia 'Roma' AGM
Bistorta amplexicaulis 'Taurus'
Campanula lactiflora 'Prichard's Variety' AGM
Convallaria majalis AGM – Native to GB
Epimedium 'Spine Tingler' AGM
Euphorbia griffithii 'Fireglow'
Geranium 'Patricia' AGM
Geranium pratense – Native to GB and Ireland
Geranium pratense 'Striatum' – Cultivar of native to GB and Ireland
Geranium sylvaticum 'Mayflower' AGM – Cultivar of native to GB and Ireland
Helleborus foetidus AGM – Native to GB
Helenium 'Sahin's Early Flowerer' AGM
Helleborus argutifolius AGM
Hosta 'Regal Splendour' AGM
Iris foetidissima – Native to GB
Lythrum salicaria 'Blush' – Cultivar of native to GB and Ireland
Lythrum salicaria 'Robert' - Cultivar of Native to GB and Ireland
Paeonia 'Coral Charm' AGM
Phlox paniculata 'Blue Paradise' AGM
Polemonium caeruleum – Native to GB
Polemonium 'Northern Lights' AGM
Primula beesiana AGM
Primula veris – Native to GB and Ireland
Primula vulgaris – Native to GB and Ireland
Rudbeckia 'Goldsturm' AGM
Salvia glutinosa
Solidago rugosa 'Fireworks' AGM
Spiraea venusta 'Magnifica' AGM
Symphotrichum novae-angliae 'Helen Picton' AGM, S . Novi-Belgii 'Coombe Fishacre' AGM
Thalictrum 'Black Stockings ' AGM, Thalictrum flavum subsp. glaucum – Subspecies of native to GB and Ireland
Veronicastrum virginicum 'Lavendelturm ' AGM

Ferns

Asplenium scolopendrium AGM – Native to GB and Ireland
Athyrium niponicum var. pictum AGM
Cyrtomium falcatum AGM
Dryopteris erythrosora 'Brilliance' AGM
Dryopteris filix-mas – Native to GB and Ireland
Blechnum spicant AGM – Native to GB and Ireland

Grasses

Briza media – Native to GB and Ireland
Calamagrostis × acutifolia 'Karl Foerster' AGM
Calamagrostis brachytricha
Carex elata 'Aurea' AGM – Cultivar of native to GB and Ireland, Carex oshimensis 'Evergold' AGM
Miscanthus sinensis 'Kleine Silberspinne' AGM
Panicum virgatum 'Dallas Blues' AGM
Molinia caerulea subsp.'Transparent' AGM – Cultivar of native to GB and Ireland

Bulbs

Allium 'Gladiator' AGM
Crocosmia × crocosmiiflora 'Carmin Brilliant' AGM
Crocus biflorus 'Blue Pearl ' AGM
Cyclamen orbiculatum AGM
Eranthis hyemalis AGM
Ipheion 'Rolf Fielder' AGM
Galanthus 'Elwesii' AGM
Hyacinthoides non-scripta – Native to GB and Ireland
Narcissus 'Rijnveld's Early Sensation' AGM

Links

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