RHS Seed Exchange 2020

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RHS Seed Exchange

rhs.org.uk/seedlist Introduction to RHS Seed Exchange 2121

The Royal Horticultural Society is the UK’s Dispatch of Orders leading gardening charity, which aims to enrich We will start to send out orders from January everyone’s life through plants, and make the UK a 2020 and dispatch is usually completed by the greener and more beautiful place. This vision end of April. If you have not received your seed underpins all that we do, from inspirational by 1st May please contact us by email: gardens and shows, through our scientific [email protected] research, to our education and community programmes. We’re committed to inspiring Convention on Biological Diversity everyone to grow. 3Nagoya Protocol4 In accordance with the Convention on Biological Most of the seed offered is collected in RHS Diversity (CBD), the Royal Horticultural Society Gardens. Other seed is donated and is offered supplies seed from its garden collections on the under the name provided by the donor. In many conditions that: cases only limited quantities of seed are available. ⅷ The plant material is used for the common However, we feel that even small quantities good in areas of research, education, should be distributed if at all possible. conservation and the development of horticultural institutions or gardens. Our seed is collected from open-pollinated If the recipient seeks to commercialise the plants, therefore may not come true. ⅷ genetic material, its products or resources derived from it, then written permission must Please note we are only able to send seed to be sought from the Royal Horticultural addresses in the UK and EU6 including Society. Such commercialisation will be Switzerland6 Norway and Iceland5 subject to the conditions of a separate agreement. Applications for RHS seed should be received by 31st March 2020. ⅷ The genetic material, its products or resources derived from it are not passed on to a third party for commercialisation without written permission from the Royal Horticultural Society.

ⅷ It is a condition of supply that any publications resulting from the use of the plant material should acknowledge the Royal Horticultural Society as supplier. A copy of any publication, report or data gained from the material must be logged with the Royal Horticultural Society Lindley Library.

2 Abbreviations A Annual B Biennial BCT Bulb, corm or tuber G Grass H Herbaceous plant R Rock garden plant S Shrub T Tree

Alliaceae 26 Allium cristophii , BCT , bulbous, glaucous leaves and large flowerheads made up of many small, purple, star-like flowers. 50cm. Apiaceae 7 Ammi majus , A, upright annual with umbels of small white flowers in the summer. 0.5–1m. 52 Anthriscus sylvestris , H, fern-like leaves and umbels of tiny white flowers. 1m. 56 Astrantia major , H, erect, wiry stems bearing flowerheads in a range of colours from pink to deep purplish-red in late spring. 60–90cm. 8 Bupleurum rotundifolium , A, branching annual with roundish leaves and clusters of tiny yellow flowers. 60cm. 61 Cenolophium denudatum , H, finely-divided dark green leaves, bearing many flat umbels of greenish-white flowers in summer and autumn. 70cm. 74 Eryngium agavifolium , H, evergreen perennial with a rosette of sharply toothed, sword-shaped leaves and small, green flowerheads in late summer. 1m. 15 Eryngium giganteum , B, sea holly with steel blue flowers and silvery white bracts, fading to light brown. 1.2m. 75 Eryngium pandanifolium , H, a dense clump of large, spiny-margined blue-green leaves. In late summer it produces long stems bearing many small, round, purplish- grey flowerheads. 4m. 76 Ferula tingitana , H, a tall, architectural perennial with umbels of yellow-green flowers in summer. 1.5m. Apocynaceae 49 Amsonia hubrichtii , H, narrow leaves and pale blue star-shaped flowers in spring. Good autumn colour. 60–80cm.

3 50 Amsonia tabernaemontana var5 salicifolia , H, slender leaves and star-like clusters of steely blue flowers in late spring into early summer. 0.9m. Araliaceae 146 Fatsia japonica , S, exotic-looking, evergreen shrub of open, spreading habit, with large glossy lobed leaves and small white flowers in globose clusters, followed by small black fruits. 4m. Asparagaceae 32 Galtonia candicans , BCT , bulbous, conical racemes of fragrant, nodding, bell- shaped white flowers in late summer. 0.5–1m. 84 Hosta sieboldiana var5 elegans , H, large clump of broad, blue-grey leaves to 20–30cm in length and racemes of lilac-tinged white, bell-shaped flowers. 75cm. 33 Hyacinthoides non-scripta , BCT , bulbous, linear leaves with arching racemes of fragrant, tubular, violet-blue flowers in spring. 0.5m. 35 Muscari armeniacum , BCT , bulbous, erect stems bearing dense spikes of white- tipped, violet-blue, egg-shaped flowers in spring. 20cm. 135 Paradisea liliastrum , R, a clump-forming herbaceous perennial to 60cm in height, with grassy leaves and erect stems bearing lily-like white flowers in early summer. Asphodelaceae 54 Asphodeline lutea , H, blue-green leaves with dense racemes of fragrant star- shaped yellow flowers. 1.2m. 55 Asphodelus aestivus , H, grey-green linear leaves and spires of pink-veined, white star-like flowers in late spring. 90cm. Asteraceae 58 Berkheya purpurea , H, rosette forming, with large purplish-white flowers and jagged, silvery leaves. Good for dry, sunny sites. 40cm. 9 Centaurea cyanus , A, solitary deep blue flowers in late spring and summer. 0.75m. 62 Centaurea macrocephala , H, a large, clump-forming perennial with yellow flowerheads 5cm across in summer from brown buds. 1m. 10 Coreopsis tinctoria , A, pinnate foliage and abundant yellow daisy-like flowers with deep red centres. 90cm. 11 Cosmos bipinnatus , A, free flowering with fine, fern-like foliage and saucer- shaped flowers in pink, red and white. 1.5m.

4 12 Cosmos sulphureus , A, produces masses of orange flowers over the summer. Is tolerant of dry conditions. 0.5–1m. 73 Echinacea purpurea , H, upright perennial with solitary flowers, slightly reflexed purple petals with a brown central disk. 1m. 132 Erigeron karvinskianus , R, forming wide mats to 15cm in height, with narrow, hairy leaves and daisy-type flowerheads 15mm in width, opening white but soon turning pink. 15cm. 79 Gazania linearis , H, mat-forming growth habit with large solitary daisy-like flowers in shades of yellow and orange. 0.25–0.50m 17 Glebionis segetum , A, upright with pinnately lobed leaves and solitary, bright yellow, daisy-like flowerheads in summer. 0.5–1m. 18 Helianthus annuus , A, usually tall and erect with large daisy-like flowerheads in shades of yellow, orange or brown. 1–4m. 22 Onopordum acanthium , B, architectural, with spiny, grey leaves and purple thistle-like flowerheads in summer. 2.5–4m. Bignoniaceae 140 Campsis radicans , S, a vigorous self-clinging woody climber growing to 10m, with pinnate leaves and clusters of bright orange or red, trumpet-shaped flowers in late summer. 141 Catalpa bignonioides , T, pale green, broad-ovate leaves to 25cm in length. Flowers 3 –4cm in width, white, marked with orange and purple, in conical panicles. Fruit a slender bean-like pod. 12m. Brassicaceae 82 Hesperis matronalis , H, loose clusters of white or pale to mid purple scented flowers appear in late spring and early summer. 60–90cm. 89 Lunaria rediviva , H, heart-shaped, finely toothed leaves, bearing racemes of fragrant, lilac-white flowers in late spring to early summer. 90cm. Bromeliaceae 72 Dyckia frigida , H, shrubby rosette-forming, evergreen succulent with yellow flowers. 60cm. Campanulaceae 46 Adenophora koreana , H, a deciduous perennial with bell-shaped, violet-blue flowers in summer, above rounded basal leaves. 1m.

5 60 Campanula latifolia , H, clump-forming with oval leaves and loose racemes of nodding bell-shaped violet-blue or white flowers in summer. 1.2m. Caprifoliaceae 63 Cephalaria gigantea , H, clump forming with tall, branched stems carrying light yellow scabious-like flowerheads to 6cm across in summer. 1.5–2.5m. 14 Dipsacus fullonum , B, bright green prickly foliage. Flowerheads are cone-shaped, stiffly bristly and the flowers are tiny and blue, appearing in a band round the flowerhead over an extended flowering time. 2m. 86 Knautia macedonica , H, pinnately lobed basal leaves with a succession of deep crimson pincushion-like flowerheads across from mid-summer. 1m. 102 Scabiosa columbaria , H, a compact herbaceous perennial, with grey-green leaves and pale blue-lilac flowerheads from summer to early autumn. 45cm. 107 Succisella inflexa , H, clump-forming with upright slender stems bearing pincushion-like, lilac-blue to pale purple flowers from summer. 80cms. 113 Valeriana officinalis , H, an upright perennial with pinnate leaves and rounded clusters of small pink or white flowers in summer. 1.5m. Caryophyllaceae 90 Lychnis chalcedonica , H, an erect herbaceous perennial with oval leaves and small, bright vermilion flowers in compact, domed heads. 1m. 91 Lychnis coronaria , H, a short-lived perennial with silvery-grey felted leaves and sprays of long-stalked, magenta flowers in summer. 75cm. 103 Silene dioica , H, clump-forming, semi-evergreen, with dark green leaves and clusters of rose-pink flowers with notched petals from late spring. 80cm. Celastraceae 144 Euonymus hamiltonianus , S, a tree-like, deciduous shrub to 6m tall. Small pale green flowers are followed by four-lobed, dusky pink fruit that split to reveal orange seeds. Crassulaceae 138 Umbilicus oppositifolium , R, a prostrate evergreen perennial with fleshy, ovate leaves and branched, arching racemes of small, bright yellow flowers. 20cm. Datiscaceae 64 Datisca cannabina , H, tall, clump-forming, with upright stems, with long, hanging tassels of tiny greenish-white flowers in summer. 2m.

6 Ericaceae 143 Enkianthus campanulatus , S, deciduous, erect habit, with small elliptic leaves with good autumn colour. Clusters of small cream or reddish, bell-shaped flowers from late spring to midsummer. 4–5m. Euphorbiaceae 145 Euphorbia × pasteurii , S, an architectural, robust, evergreen shrub to around 1m tall. The foliage is yellow-green with a pale midrib and honey-scented, yellow- green flowers, produced from late spring. Fabaceae 57 Baptisia australis , H, grey-green leaves and erect, lupin-like racemes of violet-blue flowers followed by dark grey pods. 1.5m. 142 Cladrastis kentukea , T, a spreading tree with light green leaves turning clear yellow in autumn. Pendent panicles of fragrant white flowers in late spring and early summer. 8 –12m. 151 Indigofera heterantha , S, a medium-sized deciduous shrub with pinnate leaves and racemes of rosy-purple flowers from early summer. 2.5m. 87 Lathyrus aureus , H, a bushy, non-climbing species bearing clusters of dusky yellow-orange flowerheads in early to midsummer. 0.5–1m. 154 Lupinus arboreus , S, fast growing, evergreen medium sized shrub with palmate leaves and dense, erect racemes of fragrant, yellow flowers.1–1.5m. 112 Trifolium rubens , H, blue-green leaves covered in soft hairs, with attractive reddish-purple conical flowerheads, opening from silvery buds in the summer. 45cm. Francoaceae 77 Francoa sonchifolia , H, evergreen perennial with lobed basal leaves and racemes of dark-veined pale pink flowers, in summer. 60cm. Hydrangeaceae 65 Deinanthe bifida , H, deep green, roughly textured leaves with loose clusters of white flowers with a greenish tinge in late summer. 50cm. 148 Hydrangea paniculata , S, deciduous woody plant with toothed leaves and flowerheads in large, pinky-white, conical panicles in late summer to early autumn. 4m . 149 Hydrangea seemannii , S, woody, evergreen climber with leathery leaves and domed greenish-white flower-heads in summer. 10m.

7 Hypericaceae 150 Hypericum choisianum, S, deciduous shrub, with wide, cup-shaped golden yellow flowers in summer. 1.8m. Iridaceae 67 Dierama pulcherrimum , H, clump forming with evergreen linear leaves and tall, arching stems bearing nodding, deep pink flowers in summer. 1.5m. 134 Gladiolus italicus , BCT , bulbous, an upright, cormous perennial with sword-shaped leaves and loose spikes of up to twenty magenta-coloured flowers in summer. 0.5–1m. 85 Iris sibirica , H, narrow grassy foliage and branched stems bearing violet-blue flowers in early summer. 90cm. 38 Libertia chilensis , G, clump-forming perennial with grass-like, evergreen leaves and panicles of white flowers from late spring. 90cm. 137 Sisyrinchium angustifolium , R, clump-forming perennial with narrow leaves. In summer, iris like flowers of deep blue with yellow throats are borne on long stems. 45cm. 104 Sisyrinchium palmifolium , H, has broad, flat stems with clusters of large, yellow, saucer-shaped flowers over an extended period in summer. 45cm. Juncaceae 39 Luzula nivea , G, evergreen perennial forming a loose clump of dark green leaves with lax clusters of small, white flowers in summer. 60cm. Lamiaceae 59 Betonica officinalis , H, an upright perennial to 60cm, with scalloped, oblong leaves and dense terminal spikes of reddish-purple flowers in summer and early autumn. 88 Lepechinia hastata , H, large aromatic grey-green leaves and purplish-pink salvia-like flowers in late summer to early autumn. 1.2m. 92 Nepeta kubanica , H, a perennial with aromatic leaves and terminal spikes of deep purple, tubular flowers. 1m. 96 Phlomis russeliana , H, a hairy perennial with large, rough-textured grey-green leaves. Stout stems bear whorls of hooded, soft yellow flowers. 60–90cm. 101 Salvia nemorosa , H, upright racemes of violet-purple flowers through the summer above narrow, rough, grey-green leaves. 0.5m.

8 25 Salvia sclarea , B, strongly scented leaves and long racemes of pale pink flowers with mauve-pink bracts in late spring and summer. 1m. 106 Stachys byzantina , H, a carpeting, evergreen, densely white-woolly perennial. Erect stems to 50cm in height with purplish/pink flowers in whorls. 109 Teucrium hircanicum , H, coarse, sage-like foliage, with spikes of dusky purple-red flowers during mid-to-late summer. 35cm. Liliaceae 27 Cardiocrinum giganteum , BCT , bulbous, tall stems of fragrant, trumpet-like white flowers. Challenging to germinate. 2–4m. 31 Fritillaria meleagris , BCT , bulbous, greyish-green leaves and 1 to 2 nodding, bell-shaped purple flowers, in a checkerboard pattern. 30cm. 34 Lilium regale , BCT , bulbous, long, scented, pinky-white, trumpet-like flowers, with dark pink buds. 1m. Magnoliaceae 153 Liriodendron tulipifera , T, large deciduous tree with distinctively shaped leaves turning yellow in autumn. Bears yellowish-green tulip-shaped flowers, marked with orange within. 25m. Malvaceae 139 Abutilon × suntense , S, soft-wooded, deciduous, vigorous and fast-growing, to 5–6m. Flowers are usually mauve, borne 3 –4 together at the ends of woolly stalks. 6 Alcea rosea , B, long racemes of open funnel-shaped flowers in pink, purple, red, white or yellow. 2m. 147 Hibiscus syriacus , S, or T, a vigorous upright deciduous shrub with single flowers in violet, red or white 8–10cm across in summer. 2.5–4m. Nyctaginaceae 19 Mirabilis jalapa , A or H, a bushy, tuberous tender perennial often grown as an annual, with fragrant flowers in a wide range of colours. 0.5–1m. Onagraceae 78 Gaura lindheimeri , H, a bushy perennial with slender erect stems bearing starry white or pink-tinged flowers in loose racemes in summer and autumn. 1.5m. 93 Oenothera versicolor , H, mid-green leaves with cup-shaped flowers, produced from early summer to early autumn, starting yellow, turning orange, then red. 0.5–1m.

9 Papaveraceae 66 Dicentra formosa , H, a spreading perennial with lobed leaves and pendulous pink or white flowers borne on arching stems from late spring. 30cm. 16 Eschscholzia californica , A, finely divided blue-green leaves and orange, yellow, pink or red flowers in summer. 30cm. 94 Papaver atlanticum, H, rosettes of grey-green, toothed leaves and saucer- shaped orange flowers, borne from late spring into autumn. 45cm. 23 Papaver rhoeas , A, red, saucer-shaped flowers in summer. 60cm. 24 Papaver somniferum , A, glaucous leaves and large petalled single or double flowers in shades of red, pink, purple and white. 1.2m. Phytolaccaceae 97 Phytolacca americana , H, oval leaves and white-pink flowers from mid-summer followed by black, shiny berries in autumn. 2.5–4m. Plantaginaceae 68 Digitalis laevigata , H, deciduous perennial to 1m tall, with racemes of brown- veined, light yellow flowers 3.5cm long in summer. 1m. 69 Digitalis lutea , H, slender perennial, with downy, lance-shaped leaves in a basal rosette, and tubular, brownish-red flowers, with darker veining, in early summer. 60cm. 70 Digitalis parviflora , H, a slender perennial, with tubular, brownish-red flowers with darker veining, in early summer. 60cm. 13 Digitalis purpurea , B, tall spires of pendant flowers in pink, purple or white. 1.5m. 71 Digitalis viridiflora , H, a hardy perennial with racemes of veined greenish-yellow flowers in late spring-early summer. 90cm. 117 Veronica spicata , H, slender upright spikes of flowers throughout summer in a range of colours, from purple, pink or red. 50cm. 118 Veronicastrum sibiricum , H, lance-shaped dark green leaves with slender, dense, vertical spires of purple flowers from midsummer to early autumn. 1.5m. 119 Veronicastrum virginicum , H, erect stems bearing narrow leaves in whorls, and long terminal racemes of small flowers in pink or lilac-blue in summer. 1–2m. Plumbaginaceae 130 Armeria maritima , R, evergreen perennial forming tufts or mats of strap-shaped or linear leaves, with long-stalked, dense clusters of small cup-shaped flowers in various colours. 20cm.

10 Poaceae 36 Anemanthele lessoniana , G, clump-forming with arching leaves, tinged with red or orange and sprays of pink-brown flowers in late summer. 1.5m. 37 Deschampsia cespitosa , G, evergreen grass with feathery panicles of silvery- purple flowers on arching stems in summer. 60cm. 40 Molinia caerulea subsp5 arundinacea , G, a deciduous grass with arching, linear leaves and sprays of small, purplish flowers in summer. 1.5m. 41 Stipa gigantea , G, a tufted evergreen grass with purplish-green spikelets, turning gold when ripe, borne in arching oat-like panicles. 2.5m. 42 Stipa tenuissima , G, a deciduous grass with nodding, softly feathery panicles. 80cm. Polygonaceae 95 Persicaria bistorta , H, ovate leaves and dense spikes of small pale pink flowers in summer and early autumn. 1m. Primulaceae 28 Cyclamen graecum , BCT , cormous, with velvety leaves and flowers ranging from pink to white from Sept–Oct. 10cm. 29 Cyclamen hederifolium , BCT , cormous, with ivy-shaped leaves patterned with silvery-green and pink flowers opening before or with the leaves. 12cm. 30 Cyclamen mirabile , BCT , cormous, with rounded, marbled leaves with grey, purplish beneath and pale pink flowers. 8cm. 99 Primula bulleyana hybrids , H, semi-evergreen with rosettes of leaves and erect stems bearing 5–7 whorls of orange-yellow flowers 2cm across. 60cm. 100 Primula veris , H, rosette of oblong leaves and upright stems bearing umbels of nodding, bell-shaped, fragrant rich, yellow flowers. 25cm. Ranunculaceae 43 Aconitum carmichaelii , H, clump forming, with deeply divided leaves and spires of deep blue flowers in late summer. 1–1.5m. 44 Actaea rubra , H, clump-forming with spikes of fluffy white flowers in late spring to early summer, followed by red berries. 0.5m. 45 Actaea simplex Atropurpurea Group , H, deep purple stems and foliage and dense spikes of small, fragrant white flowers in early autumn. 1m. 51 Anemone × hybrida , H, palmately lobed leaves and saucer-shaped pink or white flowers in summer. 1–1.5m.

11 81 Helleborus foetidus , H, evergreen, with erect stems and nodding, pale green flowers borne in large open clusters from midwinter. 60cm. 136 Pulsatilla ambigua , R, clump-forming perennial with finely dissected leaves and violet bell-shaped flowers in spring followed by silky-plumed seedheads. 20cm. 110 Thalictrum flavum , H, clump-forming with large, pinnate leaves and branched clusters of fluffy yellow flowers in summer. 1–1.5m. 111 Thalictrum rochebruneanum , H, a clump-forming perennial to about 90cm with leaves composed of many small leaflets and loose sprays of small, lavender- pink or white flowers produced in summer. 1m. Rosaceae 129 Acaena microphylla , R, a carpeting evergreen perennial with small, pinnate leaves tinged bronze when young with globular whitish flowerheads, on short stems, followed by reddish burrs. 30cm. 47 Alchemilla mollis , H, clump-forming with softly hairy, light green leaves with scalloped edges and sprays of small, bright yellow flowers. 45cm. 53 Aruncus sinensis , H, plumes of small creamy-white flowers in late spring to early summer over bipinnate, Astilbe-like foliage. 1.5–2.5m. 131 Dryas × suendermannii , R, carpet-forming with toothed leaves and dainty white flowers with a yellow centre, followed by fluffy seedheads. 12cm. 133 Geum rivale , R, a herbaceous perennial with bright green leaves, with dusky pink or pale orange drooping flowers appearing from late spring. 30–60cm. 80 Gillenia trifoliata , H, has reddish stems bearing small, 3-lobed leaves and open sprays of starry white flowers, with contrasting red calyces. 0.5–1m. 98 Potentilla atrosanguinea , H, clump-forming perennial with red flowers, carried in loose, open sprays on wiry stems in summer. 45cm. Sapindaceae 152 Koelreuteria paniculata , T, deciduous tree with pinnate leaves, pinkish in spring, turning yellow in autumn. Panicles of small yellow flowers, followed by ornamental bladdery bronze fruits. 12m. Saxifragaceae 83 Heuchera cylindrica , H, clump-forming with rounded leaves and a pale green metallic mottling, with spires of small, creamy-yellow flowers in late spring. 60cm. 108 Tellima grandiflora , H, bluntly lobed, rounded leaves, with erect racemes to 75cm tall of small, cream, sometimes fragrant, flowers in late spring and early summer.

12 Scrophulariaceae 114 Verbascum chaixii , H, rosette of greyish-hairy leaves, with narrow panicles of white flowers with purple centres, in summer. 1m. Solanaceae 20 Nicandra physalodes , A, pale blue and white bell shaped flowers, followed by round berries enclosed in a green/purple calyx. 1.2m. 21 Nicotiana langsdorffii , A, slender panicles of nodding, light green, long-tubed, bell-shaped flowers, opening in the evenings in summer on a branched flowering stem. 1.5m. 105 Solanum atropurpureum , H, a short-lived perennial with dark green and dark purple stems, both leaves and stems armed with spiny prickles. Small, yellow, star-shaped flowers in summer, followed by small, yellow fruit. 1.5m. Trochodendraceae 155 Trochodendron aralioides , S, glossy, dark green leaves with bright margins and petal-less bright green flowers from late spring. 4.5m. Verbenaceae 115 Verbena bonariensis , H, tall perennial with erect, branching stem, bearing sparse, oblong leaves and large branched clusters of small, purple flowers from summer to autumn. 2m. 116 Verbena hastata , H, an upright perennial with narrow leaves and spikes of small, violet-blue to pinkish-purple flowers on tall, branched stems from early summer. 1–1.5m. Vitaceae 48 Ampelopsis brevipedunculata , H, vigorous self-clinging, woody climber with lobed leaves, sometimes attractively marbled, with blue berries in the autumn. 2.5–4m.