| Plant | How much | Notes | Ref |
| perennial | |||
| Agapanthus | 4 | Worth a try? | RHS Sarah Raven |
| Agastache 'Blue Fortune' | 5 | RHS | |
| Agastache foeniculum | 5 | RHS | |
| Alstroemeria | 4 | ||
| Anthemis tinctoria 'E.C. Buxton' | 4 | RHS | |
| Anthriscus sylvestris 'Ravenswing' | 5 | RHS | |
| Artemisia ludoviciana 'Valerie Finnis' | 4 | RHS | |
| Aruncus dioicus | 6 | Unselected has AGM. Also available: 'Horatio' | RHS RHS |
| Astilbe chinensis var. taquetii 'Purpurlanze' | 5 | Behind pond? | RHS |
| Astilboides tabularis | 4 | Where? | RHS |
| Atriplex hortensis var. rubra | 4 | RHS | |
| Baptisia australis | 6 | RHS | |
| Beesia calthifolia | 4 | Crocus | |
| Briza maxima | 5 | RHS | |
| Canna 'Wyoming' | 7 | RHS | |
| Corydalis flexuosa | 6 | Edging | Wikipedia RHS |
| Crambe cordifolia | 4 | RHS | |
| Darmera peltata | 4 | Middle of a border. Not really tall enough | RHS |
| Daucus carota 'Dara' | 4 | RHS Gardeners' World | |
| Dianthus 'Mrs Sinkins' | 4 | Edging | RHS |
| Echinacea purpurea | 4 | syn. Rudbeckia purpurea | RHS |
| Elegia capensis | 4 | Gardeners' World Penberth Plants | |
| Epimedium x youngianum 'Niveum' | 4 | Ballyrobert Gardens | |
| Erysimum 'Bowles Mauve' | 5 | syn. Cheiranthus | RHS |
| Euphorbia rigida | 4 | Special Plants Nursery | |
| Euphorbia palustris | 5 | RHS | |
| Fatshedera 'Lizei' | 5 | SE corner? | RHS |
| Filipendula rubra 'Venusta' | 5 | RHS | |
| Fritillaria imperialis | 5 | RHS | |
| Geranium 'Orion' | 5 | ||
| Hedychium coccineum 'Tara' | 4 | RHS | |
| Helleborus corsicus | 4 | syn. H. argutifolius | RHS |
| Imperata cylindrica 'Rubra' | 4 | RHS | |
| Iris histrioides 'George' | 5 | (Reticulata) | RHS |
| Iris ensata | 4 | syn. Iris kaempferi | RHS |
| Iris versicolor | 5 | RHS | |
| Liatris spicata 'Kobold' | 6 | Gardeners' World | |
| Liriope muscari | 6 | RHS | |
| Lithodora diffusa 'Heavenly Blue' | 5 | RHS | |
| Matthiola fruticulosa ssp perennis 'Alba' | 4 | ||
| Melittis melissophyllum 'Royal Velvet' | 4 | Wikipedia Gardeners' World | |
| Nepeta racemosa 'Walker's Low' | 4 | RHS | |
| Oenothera biennis | 7 | How? My plants haven't taken | RHS |
| Oenothera lindheimeri | 5 | syn. Gaura lindheimeri | |
| Omphalodes cappadocica 'Cherry Ingram' | 4 | RHS | |
| Persicaria microcephala 'Red Dragon' | 4 | Edging | RHS |
| Podophyllum versipelle 'Spotty Dotty' | 5 | Burncoose | |
| Rehmannia elata | 4 | RHS | |
| Rodgersia pinnata 'Superba' | 4 | Middle of border. No - not tall enough | RHS |
| Rodgersia podophylla 'Rotlaub' | 4 | RHS | |
| Rudbeckia fulgida var. sullivantii 'Goldsturm' | 6 | RHS | |
| Salvia nemorosa 'Ostfriesland' | 4 | RHS | |
| Salvia argentea | 4 | Biennial or short lived. Mine didn't flower | RHS |
| Sedum rupestre 'Angelina' | 4 | RHS Perennials.com | |
| Sempervivum | 5 | Wikipedia | |
| Soleirolia soleirolii | 5 | Under wall? | RHS |
| Thymus serpyllum 'Pink Chintz' | 5 | RHS | |
| Trachystemon orientalis | 5 | RHS | |
| Trillium grandiflorum | 4 | RHS | |
| Trollius x cultorum 'Lemon Queen' | 5 | Perennials.com | |
| Valeriana officinalis | 4 | Wikipedia RHS | |
| Verbascum 'Christo's yellow lightning' | 4 | Great Dixter | |
| Verbena hastata | 5 | Better than bonariensis for heavy soil | RHS |
| Verbena officinalis var. grandiflora 'Bampton' | 4 | RHS | |
| shrub | |||
| Callistemon citrinus 'Splendens' | 5 | Where? | RHS |
| Caryopteris x clandonensis 'Worcester Gold' | 5 | RHS | |
| Ceratostigma willmottianum | 4 | Where? | |
| Ceratostigma plumbaginoides | 5 | Low, for edge | RHS |
| Correa reflexa | 5 | RHS | |
| Cotoneaster franchetii | 5 | E fence? | Best4Hedging |
| Deutzia x hybrida 'Mont Rose' | 5 | RHS | |
| Diervilla splendens | 4 | RHS | |
| Griselinia littoralis | 5 | Against E fence? | RHS |
| Itea ilicifolia | 4 | Windy fence? | Ballyrobert Gardens |
| Lavatera x clementii 'Rosea' | 5 | syn. Lavatera olbia Rosea. Margery F. says OK in shade | RHS |
| Leycesteria formosa | 7 | RHS | |
| Lonicera japonica 'Hall's prolific' | 7 | Hayloft | |
| Lophomyrtus x ralphii 'Magic Dragon' | 4 | Crocus | |
| Lotus hirsutus | 4 | RHS Hardy's | |
| Nandina domestica 'Obsessed' | 4 | By front door | RHS Dobbies |
| Paeonia | 7 | Kelways? | Kelways |
| Paeonia suffruticosa 'Okar' | 4 | Where? | RHS Kelways |
| Photinia x fraseri 'Red Robin' | 9 | Cover for E fence? | RHS RHS |
| Spiraea japonica 'Anthony Waterer' | 5 | RHS | |
| bulb | |||
| Acis autumnalis | 4 | RHS | |
| Anemone blanda | 4 | RHS | |
| Anenome nemorosa | 4 | RHS | |
| Colchicum autumnale | 7 | Bulbs are shortlived. Usk? | RHS |
| Crinum x powellii | 6 | RHS Beth Chatto | |
| Leucojum aestivum | 5 | RHS | |
| Lilium 'Casa Blanca' | 4 | RHS | |
| Narcissus 'Rapture' | 4 | RHS | |
| climber | |||
| Akebia quinata | 7 | Windy fence | RHS |
| Clematis urophylla 'Winter Beauty' | 5 | RHS Parkers | |
| Cobea scandens | 4 | Where? | RHS |
| Muehlenbeckia complexa | 4 | Where? | RHS |
| Passiflora caerulea | 5 | RHS | |
| Rosa 'Wedding Day' | 5 | NE corner? | David Austin Gardeners' World |
| Trachelospermum asiaticum | 4 | RHS | |
| grass | |||
| Anemanthele lessoniana | 4 | syn. Pheasant tail grass | Crocus Beth Chatto |
| Luzula sylvatica 'Hohe Tatra' | 4 | North Hill nurseries | |
| Milium effusum 'Aureum' | 5 | RHS | |
| alpine | |||
| Campanula cochleariifolia 'Elizabeth Oliver' | 5 | Wikipedia RHS | |
| Chamaemelum nobile | 4 | Under wall? | RHS Wikipedia |
| Delosperma cooperi | 4 | Edging | RHS |
| Dryas x suendermannii | 5 | RHS | |
| Globularia cordifolia | 5 | RHS | |
| bog | |||
| Filipendula ulmaria | 5 | Tall middle of border | Wikipedia |
| marginal | |||
| Sagitttaria sagittifolia | 5 | Wikipedia Puddle Plants | |
| biennial | |||
| Nicotiana sylvestris | 7 | RHS | |
| bedding | |||
| Petunia 'Dark purple' | 4 | RHS | |
| tree | |||
| Buddleia | 5 | Where? | RHS |
| Buddleia x weyeriana 'Sungold' | 5 | RHS | |
| Magnolia loebneri 'Leonard Messel' | 5 | Dyffryn has one in a pot | RHS |
| Picea pungens 'Globosa' | 5 | RHS | |
| Wollemia nobilis | 5 | RHS | |
| annual | |||
| Tithonia rotundifolia | 4 | Grow on wigwam? B2 | RHS |
| Zinnia 'Profusion series' | 4 | RHS | |
| herb | |||
| Rumex sanguineus 'sanguineus' | 4 | Gardeners' World Crocus | |
| fern | |||
| Adiantum venustum | 5 | RHS | |
| Asplenium trichomanes | 5 | RHS | |
| Pteris cretica | 4 | RHS | |
| Woodwardia fimbriata | 4 | Where? | Crocus |
| succulent | |||
| Agave americana | 5 | Pot | RHS |
| deep | |||
| Fontinalis antipyretica | 5 | Puddle Plants | |
| floating | |||
| Ceratophyllum demersum | 4 | Puddle Plants | |
| Orontium aquaticum | 4 | RHS | |