Plant List I
| Iberis | sempervirens | "Weisser Zwerg" | A very compact evergreen subshrub with dark green leaves and clusters of white flowers. Height 15cm. Moist well-drained soil in sun. Apr.-May. |
| Ilex | aquifolium | "Argentea Marginata Pendula" | An evergreen weeping shrub with purple stems and spiny white margined, dark green leaves. Insignificant flowers in summer producing red berries in autumn. Height 4m. Spread 3m. Moist well-drained soil in sun. |
| Ilex | aquifolium | "Argentea Marginata" | An evergreen shrub with spiny, white margined, dark green leaves. Insignificant flowers in summer producing abundant bright red berries in autumn. Height 15m. Spread 4m. Moist well-drained soil in sun. Flowers from May to June. |
| Ilex | aquifolium | "Ferox Argentea" | An evergreen purple stemmed shrub with cream-margined, dark green leaves covered with spines. Height 8m. Spread 4m. Moist well-drained soil in sun. |
| Ilex | aquifolium | "Golden Milkboy" | An evergreen purple stemmed shrub, spiny green leaves with irregular gold central markings. Height 15m. Spread 4m. Moist well-drained soil in sun. |
| Ilex | aquifolium | "Handsworth New Silver" | A dense evergreen purple stemmed shrub with mid-green, spiny leaves with creamy margins. Produces bright red berries. Height 8m. Spread 4m. Moist well-drained soil in sun. May to June. |
| Ilex | crenata | "Golden Gem" | "Box-leaved Holly". A compact evergreen shrub with golden yellow leaves turning yellow-green in summer. Height 1m. Moist well-drained soil in sun. |
| Ilex | myrtifolia | "Aureomaculata" | A compact holly with rich, variable golden variegation. A male clone hence no berries. Height 3m. Spread 2.5m. Well-drained soil in sun or part shade. Does not like shallow chalky soils. |
| Ilex | x altacierensis | "Golden King" | An erect evergreen shrub with broad almost spineless grey-green mottled leaves with broad bright gold margins. being a female, it produces bright red fruit from autumn onwards.. Height 6m. Spread 5m. Well-drained soil in sun or part shade. |
| Ilex | x altaclarensis | "Lawsoniana" | An erect evergreen shrub with light green leaves irregularly splashed gold. A female clone that produces bright red fruit. Height 6m. Spread 5m. Moist well-drained soil in sun. Flowers from May to June. Fruits from September |
| Ilex | x meserveae | "Blue Angel" | An upright evergreen shrub with dark purple stems and glossy dark bluish green leaves. Height 4m. Spread 2m. Moist well-drained soil in sun. |
| Impatiens | omeiana | Freshly emerging purple stems in spring produce fleshy narrow slightly toothed leaves.creamy yellow hooded flowers on lax stems. Height 50cm. moist soil in part shade. Jun.-Sept. | |
| Imperata | cylindrica | "Rubra" | An attractive grass with narrow yellow-green leaves tipped with red in spring, by mid-summer the whole leaf is red. Height 45cm. Moist well-drained soil in sun. |
| Incarvillea | arguta | An erect woody based perennial with divided dark green, pinnate leaves and tubular pink flowers. Height 90cm. Moist well-drained soil in sun or part shade. Jun.-Jul. May need winter protection from wet. | |
| Incarvillea | delavayi | A perennial with basal, divided dark green leaves and tubular, trumpet-shaped deep rose-pink flowers. Height 60cm. Moist well-drained soil in sun or part shade. Jun.-Jul. | |
| Incarvillea | forrestii | A perennial with basal, divided dark green leaves and tubular, trumpet-shaped mid-pink flowers with a yellow eye. Height 45cm. Moist well-drained soil in sun or part shade. Jun.-Jul. | |
| Incarvillea | mairei | An herbaceous perennial with basal, dark green wrinkled leaves, widely trumpet-shaped deep pink flowers with yellow and white inside. Height 15-50cm. Moist well-drained soil in sun or part shade. Jun.-Jul. | |
| Incarvillea | zhongdianensis | A perennial with basal, divided dark green leaves and tubular, trumpet-shaped cerise-purple flowers with a yellow throat. Height 25-35cm. moist well-drained soil in sun or part shade. Jun.-Jul. | |
| Indigofera | amblyantha | An upright deciduous shrub with pinnate leaves and racemes of shrimp-pink flowers over a long period. Height 1.5-2m. Spread 1-1.5m. Well-drained soil in sun. Flowers from June to September. | |
| Indigofera | heterantha | An elegant shrub with arching branches of grey-green, fern-like leaves and pea-like purple-pink flowers. Height 2m. Spread 2m. Well-drained soil in sun. June to September. | |
| Inula | hookeri | A clump forming perennial with furry buds that open to yellow daisy flowers with an orange-yellow central cone. Height 60cm. Moist well-drained soil in sun. Jun.-Aug. | |
| Ipheion | "Alberto Castillo" | Large white scented star-shaped flowers. Slightly glaucous strap-shaped leaves. Height 10cm. Feb.-Mar. Sunny, well-drained site | |
| Ipheion | "Charlotte Bishop" | New, pink flowered form of this bulbous South American perennial. Height 10cm. Feb.-Mar. Needs sunny well- drained site, or maybe Alpine House. | |
| Ipheion | "Rolf Fiedler" | A bulbous perennial with narrow strap shaped leaves and star-shaped, bright blue flowers with a white eye.. Height 10-15cm. Well-drained site in full sun. Feb.-Mar. | |
| Ipheion | uniflorum | "Album" | A bulbous perennial with narrow strap shaped leaves and scented, star-shaped, white flowers in spring. Height 10-15cm. Well-drained site in full sun. Feb.-Mar. |
| Ipheion | uniflorum | "Froyle Mill" | A bulbous perennial with narrow strap shaped leaves and scented, star-shaped, dusky violet flowers. Height 15-20cm. Well-drained soil in sun. Jan.-Feb. |
| Ipheion | uniflorum | "Wisley Blue" | A bulbous perennial with narrow strap shaped leaves and scented, star-shaped, violet-blue flowers in spring. Height 10-15cm. Well-drained site in full sun. Feb.-Mar. |
| Iris | "Action Front" | A tall bearded iris with fans of strap shaped leaves and large flowers with rich mahogany-red falls with cream veining and a golden yellow beard and dusky brown/mauve standards. Height 90cm. Well-drained soil in sun or part shade. | |
| Iris | "Actress" | A "Bearded Iris" with a rich warm scent from masses of large broad amethyst-blue flowers, the ruffled falls paling towards the centre and a dark orange beard. Height 80cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Austrian Sky" | A small bearded iris with bright sky blue standards the falls having darker markings with white flecks. Height 30cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Batik" | A border bearded Iris. | |
| Iris | "Bearded Mixed" | These have lost their identity. They vary in height between 80 to 120cm. Colour is as seen. All require a sunny well-drained site. | |
| Iris | "Bewilderbeast" | A tall bearded Iris. Maroon falls and standards with yellow etching. Orange beards. | |
| Iris | "Black Beauty" | A "Dutch" iris with thin strap-like leaves and flowers with midnight-blue standards and mahogany-black falls with a golden blotch. Height 50cm. Well-drained soil in sun or part shade. | |
| Iris | "Black Knight" | Tall bearded Iris with deep violet flowers on a plant 75cm. high. fertile well-drained soil in full sun. May-Jun. | |
| Iris | "Blue Shimmer" | A heavily scented "Bearded Iris" with the falls being a blue-mauve picotee with the standards being the same blue suffused white. Height 1m. Well-drained soil in sun. May. | |
| Iris | "Blue Sparks" | A small bearded iris with pale blue standards and falls having darker shading and an orange-yellow beard. Height 30cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Bright Eyes" | A miniature dwarf bearded iris with white standards and white falls with a royal blue central blotch and yellow tones. The beard is yellow. Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Bronze Beauty" | A "Dutch" iris with thin strap-like leaves and flowers with deep mahogany-bronze standards and amber-bronze falls with golden blotches. Height 50cm. Well-drained soil in sun or part shade. | |
| Iris | "Cantab" | A small bulbous iris with cobalt blue standards and Cambridge blue falls with a central yellow blotch. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | "Carnival Time" | A scented "Bearded Iris" with amber edged darkening to chestnut-red centre falls, overlaid with delicate velvety blue bloom. Compact ruffled standards of coppery-brown. Height 90cm. Well-drained soil in sun. May. | |
| Iris | "Edward of Windsor" | A tall bearded Iris. The falls and standards are a pastel pink. Height 1m. Well-drained soil in sun. May. | |
| Iris | "Edward" | A small bulbous iris with dark blue flowers with orange markings. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. Plant 5cm. below pot surface. | |
| Iris | "Elizabeth of England" | A tall bearded iris with powder blue standards and falls. The beard is yellow. Height 90cm. Well-drained soil in sun. May-Jun. | |
| Iris | "English Cottage" | A tall bearded Iris with standards white with a hint of blue and white falls edged pale blue. The beards are a pale yellow. Height 80cm. Well-drained soil in sun. May. | |
| Iris | "Extra" | A miniature dwarf bearded iris with light violet-blue standards and mid violet blue falls with a red-violet blotch. Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Fashion Lady" | A miniature dwarf bearded iris which is a yellow "Self". Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Flaming Dragon" | A tall bearded iris that is a bright orange-apricot self, with a golden glow. The beard is red-orange. Height 80cm. Well-drained soil in sun. May. | |
| Iris | "Frank Elder" | Lovely pale blue flowers with darker veining, the falls being overlaid with yellow. Height 10cm. Feb.-Mar. Sunny site in well-drained soil. Plant 15cm. deep (deeper than normal) | |
| Iris | "Frans Hals" | Thin leaves and sturdy stems carrying flowers with lavender-purple standards and bronze-yellow falls. Height 50cm. Moist well-drained soil in sun. May-Jun. | |
| Iris | "Frost and Flame" | A tall bearded iris with fans of strap shaped leaves and large elegant white flowers with a hint of cream on the falls and a bright orange beard. Height 1.2m. Well-drained soil in sun or part shade. | |
| Iris | "Gingerbread Man" | A dwarf bearded iris with sword-like narrow green leaves and stems of deep brown flowers with purple-blue beards. Height 35cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Gordon" | A small bulbous iris with light blue flowers tipped purple and orange marks. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. Plant 5cm. below pot surface. | |
| Iris | "Green Spot" | A dwarf bearded iris with waxy white flowers with yellowish-green spots and streaks on the falls. Height 25-30cm. Well-drained soil in sun. Apr.-May. | |
| Iris | "Grey Pearls" | A miniature dwarf bearded iris with creamy grey standards and falls with a pale yellow beard Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Harmony" | A small bulbous iris with royal blue flowers with yellow central marks on the falls. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | "Harriette Halloway" | A tall bearded iris with huge scented flowers, the falls being Mediterranean blue, paler towards the centre with buff veins. The standards are clear blue. Height 1m. Well-drained soil in sun. May-Jun. | |
| Iris | "Holden Clough" | A clump forming perennial with strap-like leaves and buff-yellow flowers heavily netted and veined rusty brown. Height 90cm. Moist soil in sun or shade. Jun.-Jul. | |
| Iris | "Indian Chief" | A tall bearded iris that is a mahogany-red self. Height 90cm. Well-drained soil in sun. May. | |
| Iris | "J.S. Dijt" | A small bulbous iris with reddish purple flowers and darker falls with yellow-orange flashes.. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. Plant 5cm. below pot surface. | |
| Iris | "Jasper Gem" | A miniature bearded iris with dirty cream standards and rusty red falls edged with yellow flecks and a yellow beard. Height 15cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Joyce" | A small bulbous iris with deep sky blue flowers and yellow and white marks on the falls. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | "Kathrine Hodgkin" | Lovely pale bluish-green flowers with darker veining, the falls being overlaid with yellow. Height 10cm. Feb.-Mar. Sunny site in well-drained soil. Plant 15cm. deep (deeper than normal) | |
| Iris | "Knick Knack" | A minature dwarf bearded iris with sword-like narrow green leaves and stems of white flowers with blue veining. Height 15cm. Well-drained soil in sun. Apr.-May. | |
| Iris | "Margeurite" | A newish variety with thin petalled light-blue flowers with dark tips to the falls and white blotches. Height 10-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | "Maya Mint" | A miniature dwarf bearded iris with white standards blushed yellow and white falls blushed greenish-blue. Yellow and white beard. Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Midas Mite" | A miniature dwarf bearded iris with light yellow standards and darker orange-yellow falls with a pale orange-yellow beard. Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Ohio Belle" | Dwarf iris with bright yellow flowers and a white beard. Height 20cm. Well-drained soil in sun. May. | |
| Iris | "Party Dress" | A wonderfully scented "Bearded Iris" with reflexed falls of soft peachy-melon, a tangerine beard and standards of soft peach. The whole flower is suffused in burnished gold. Height 1m. Well-drained soil in sun. May. | |
| Iris | "Pauline" | A small bulbous iris with reddish purple flowers and darker falls with white flashes and yellow. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. Plant 5cm. below pot surface. | |
| Iris | "Pearly Dawn" | A tall bearded iris with delicately scented white flowers with a pearl-pink centre on the standards and a yellow beard giving the falls a hint of buff. Height 65cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Pixie" | A small bulbous iris with cobalt-blue flowers. The falls are darker blue with an orange-yellow flash and white marks. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | "Pogo" | A dwarf bearded iris with sword-like narrow green leaves and stems of chrome yellow flowers with a reddish brown thumbprint on the falls. Height 40cm. Well-drained soil in sun. Apr.-May. | |
| Iris | "Purple Gem" | A small bulbous iris with pansy-violet standards and plum purple with white marks on the falls. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | "Rajah" | A tall bearded iris with yellow standards and dark crimson and purple falls with yellow streaking and an orange beard. Height 90cm. Well-drained soil in sun. May-Jun. | |
| Iris | "Red Orchid" | A tall bearded Iris with wine red flowers. | |
| Iris | "Saint Crispin" | A tall bearded iris with fans of strap shaped leaves and reflexed golden yellow falls with hints of dull gold and a bright orange beard, and slightly paler standards. Height 90cm. Well-drained soil in sun or part shade. | |
| Iris | "Shiela Ann Germaney" | Lovely pale purplish-blue flowers with darker veining, the falls being overlaid with yellow. Height 10cm. Feb.-Mar. Sunny site in well-drained soil. Plant 15cm. deep (deeper than normal) | |
| Iris | "Superstition" | A tall bearded Iris with purple-black falls and standards and a blue-black beard. Height 90cm. Well-drained soil in sun. May. | |
| Iris | "Suslik" | A miniature dwarf bearded iris with purple red-violet standards and falls with blue beard turning gold in the throat. Height 15cm. Well-drained soil in sun. May. | |
| Iris | "Three Cherries" | A miniature bearded iris with maroon flowers. Height 15cm. Well-drained soil in sun. May-Jun. | |
| Iris | "White Knight" | White flowers on plants 80cm. high. fertile well-drained soil in full sun. May-Jun. Lift and divide every 2-3 years. | |
| Iris | attica | "Mauve Form" | A dwarf bearded iris with sword-like narrow green leaves and stems of mauve flowers with the falls having white beards. Height 10-15cm.Well-drained soil in sun or part shade. May-Jun. |
| Iris | attica | "Yellow Form" | A dwarf bearded iris with sword-like narrow green leaves and stems of yellow flowers. Height 10-15cm.Well-drained soil in sun or part shade. May-Jun. |
| Iris | bucharica | A bulbous iris with glossy, narrow green leaves and stems of yellow and white flowers. Height 20-30cm. Well-drained soil in sun or part shade. May-June. | |
| Iris | bulleyana | ex dark form | An herbaceous perennial with narrow sword-like leaves and deep violet flowers with white streaks on the falls. Height 45cm. Moist soil in sun. Jun.-Jul. |
| Iris | chrysographes | A pretty iris with narrow grey-green leaves and stems of fragrant, dark red-violet flowers with gold streaks on the falls. Height 45cm. Well-drained soil in sun or part shade. Jun.-Jul. | |
| Iris | cristata | Radiating fans of leaves with lilac-blue flowers on 8cm. creeping stems. Moist soil in part shade. Apr.-May. | |
| Iris | cristata x lacustris | A hybrid of two closely related species. Stoloniferous, it forms a mat of dwarf, narrow leaves and small purple-blue flowers with yellow and white marks on the falls. Height 5-10cm. Moist soil in part shade. Apr.-May. | |
| Iris | danfordiae | A small iris with two narrow leaves and yellow flowers with greenish yellow markings on the falls. Height 8-15cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Iris | douglasiana | A pretty iris with stiff, glossy, green leaves and stems of generally mid-blue flowers heavily veined on the falls. Height 30-50cm. Well-drained soil in sun or part shade. May-Jun. | |
| Iris | ensata | "Aicho-no-kagayaki" | Narrow leaves and stems of flat flowerheads, yellow with maroon markings. Height 90cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Gusto" | Upright strap-like leaves and stems of flat double flowerheads of broad violet-blue petals with a large white centre. Height 80cm. Moist peaty soil in sun or part shade. Jun.-Jul. |
| Iris | ensata | "Himatsuri" | Narrow sword-like leaves and tall stems carrying medium-sized purple flowers with large white splashes around the yellow signals. Height 1m. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Innocence" | Narrow leaves and stems of flat flowerheads pure white with yellow signals. Height 75cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Kumo-no-obi" | Narrow leaves and stems of flat flowerheads, dark violet-purple with a yellow-orange blotch on the falls. Height 75cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Momozomo" | Narrow sword-like leaves and tall stems carrying medium-sized lavender-pink flowers striped with darker veins. Height 90cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Ruby King" | Narrow leaves and stems of flat flowerheads, dark reddish purple with a yellow-orange blotch on the falls. Height 80cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Variegata" | A pretty iris with narrow ribbed bright green and white variegated leaves and stems of purple or red-purple flowers. Height 90cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | ensata | "Yezo nishiki" | Narrow leaves and stems of flat flowerheads, purple with a yellow-orange blotch on the falls. Height 90cm. Moist peaty soil in sun or part shade. Jul.-Aug. |
| Iris | forrestii | "Hybrids" | Stems of clear yellow or mauve flowers with brown lines on the falls in early summer. Height 40cm. Grows best in moist peaty soil in sun. |
| Iris | graminea | An iris with flat narrow bright green leaves and stems of purple-violet flowers with violet veined, white tipped falls. Height 40cm. Moist soil in sun or part shade. May-June. | |
| Iris | hookeri | Formerly Iris setosa "Dwarf", an iris with slender mid-green leaves and stems of blue or purple-blue veined flowers with a basal white spot. Height 25cm. Moist peaty soil in sun. May-Jun. | |
| Iris | japonica | "Variegata" | A pretty crested iris with fans of broad variegated leaves and stems of blue flowers. Height 45cm. Moist well-drained soil in sun or part shade.Mar.-Apr. |
| Iris | lacustris | A crested iris with fans of narrow dark green leaves and stems of purple-blue to sky-blue flowers with a gold crest and a white patch on each fall. Height 5cm. Moist well-drained soil in sun or part shade. Mar.-Apr. | |
| Iris | laevigata | "Snowdrift" | An aquatic iris with broad leaves and stems of white flowers Suffused blue at the base of the falls and into the standards. Height 80cm. Wet soil in sun or part shade. Jun.-Jul. |
| Iris | lutescens | "Cambellii" | Sword-like leaves with relatively large purple-blue flowers on short stems. Height 10-15cm. well-drained soil in sun. Apr.-Jun. |
| Iris | orientalis | A vigorous iris with narrow green leaves and stems of white flowers with large yellow signals. Height 90cm. Well-drained soil in sun or part shade. Jun.-Jul. | |
| Iris | pallida | "Argentea Variegata" | An iris with broad pale green leaves with silver-white stripes and stems of soft blue flowers. Height 90cm. Moist well-drained soil in sun or part shade. May to June. |
| Iris | pallida | "Variegata" | An iris with broad bright green leaves and light yellow stripes, stems of soft blue flowers. Height 90cm. Moist well-drained soil in sun or part shade. May-Jun. |
| Iris | sanguinea | "Snow Queen" | Beardless Siberean iris with white, yellow blotched flowers in summer. Sword-like foliage. Height 75cm. Moist fertile soil in full sun. |
| Iris | setosa | A variable iris with slender mid-green leaves and stems of blue or purple-blue veined flowers with lighter veining on the falls. Height 50cm. Moist soil in sun. May.-Jun. | |
| Iris | sibirica | Vigorous clumps of bushy leaves and tall stems carrying flowers of blue, white, yellow and pink shades flowers with veining on the falls. Height 60-120cm. Moist soil in sun. Jun.-July. | |
| Iris | sibirica | "Blaue Wiesemotte" | Clumps of bushy sword-like leaves Height 90cm. Moist soil in sun. May-Jun. |
| Iris | sibirica | "Butter and Sugar" | Vigorous clumps of bushy leaves and tall stems of broad-petalled creamy-white and yellow flowers. Height 75cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Cambridge" | Vigorous clumps of bushy leaves and tall stems of broad-petalled light blue flowers with darker veining. Height 90cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Dance Ballerina Dance" | Clumps of bushy sword-like leaves and flowers with ruffled lilac-white standards and flowing lilac falls.There are honey markings around the signal area and white tinges to the edges. Height 60cm. Moist soil in sun. May-Jun. |
| Iris | sibirica | "Dreaming Yellow" | Vigorous clumps of bushy leaves and tall stems of white flowers with slightly ruffled creamy yellow falls. Height 80cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Ego" | Vigorous clumps of bushy leaves and tall stems of ruffled vivid blue flowers in early summer. Height 90cm. Moist soil in sun. |
| Iris | sibirica | "Emperor" | Vigorous clumps of bushy leaves and tall stems of rich purple flowers. Height 80cm. Moist soil in sun. June to July. |
| Iris | sibirica | "Lavender Bounty" | Vigorous clumps of bushy leaves and tall stems of lavender-pink flowers, the falls being darker than the standards. Height 90cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Lime Heart" | Vigorous clumps of bushy leaves and tall stems of broad white flowers with a pale green overcast. Height 90cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Little Twinkle Star" | A dwarf variety with clumps of sword-like leaves and mid-blue flowers. Height 35cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Melton Red Flare" | Clumps of bushy sword-like leaves and red-violet flowers with honey markings around the signal area. Height 90cm. Moist soil in sun. May-Jun. |
| Iris | sibirica | "Mountain Lake" | Clumps of sword-like leaves and deep blue broad flowers. Height 90cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Nottingham Lace" | Vigorous clumps of bushy sword-like leaves and stems of reddish-purple standards and purple-red falls with a large white signal to the outside. height 75cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Pirate Prince" | Vigorous clumps of bushy sword-like leaves and tall stems of rich dark blue flowers. Height 1m. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Rikugi Sakura" | Vigorous clumps of bushy leaves and tall stems of double pale violet-pink flowers, with honey coloured petal bases. Height 75cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Roanoke's Choice" | Vigorous clumps of bushy leaves and tall stems of pink flowers, that darken to violet-purple with white and blue ends to the signals and violet-white standards. Height 75cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Ruffled Velvet" | Vigorous clumps of bushy leaves and tall stems of violet-purple flowers, with ruffled edges. Height 60cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Silver Edge" | Sword-like leaves and mid-blue flowers with silver-lined and ruffled edges. Jun.-Jul. Height 80cm. Moist soil in sun. |
| Iris | sibirica | "Soft Blue" | Vigorous clumps of bushy leaves and stems of soft blue ruffled flowers paler at the margins and veined white. Height 75cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Sparkling Rose" | Vigorous clumps of bushy leaves and tall stems of pinkish mauve flowers with yellow at the base of the falls. Height 1m. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "Tropic Night" | Vigorous clumps of bushy leaves and tall stems of dark blue-purple flowers with attractive veining. Height 90cm. Moist soil in sun. Jun.-Jul. |
| Iris | sibirica | "White Swirl" | Clumps of sword-like leaves and wide gold-centred pure white flowers. Height 90cm. Moist soil in sun. Jun.-Jul. |
| Iris | suaveolens | Clusters of small sword-like leaves and maroon flowers with creamy markings in May-Jun. Well-drained soil in sun. Height 10cm. | |
| Iris | tectorum | "Variegata" | Bright green leaves with a broad white stripe. Lilac and white flowers. Brown seed heads. Height 50cm. Well-drained soil in sun. May. |
| Iris | unguicularis | "Oxford Dwarf" | Evergreen clumps of grass-like leaves and fragrant, deep blue flowers, feathered white and with a band of yellow on the falls. Height 20cm. Well-drained soil in sun. Jan.-Mar. |
| Iris | versicolor | An aquatic iris with slightly arched leaves and purple or lavender-blue flowers with a white veined purple patch on each fall. Height 1m. Moist soil in sun. Jun.-Jul. | |
| Iris | winogradowii | A dwarf species with primrose-yellow flowers, the falls having darker yellow blotches and spotting. Height 10cm. Well-drained soil in sun or part shade. Feb.-Mar. | |
| Isopyrum | thalictroides | A perennial with glabrous, glaucous, biternate leaves and stems carrying cup-shaped white flowers. Height 15cm. Moist soil in part shade. Mar.-Apr. | |
| Itea | ilicifolia | An evergreen shrub with arching stems and spiny toothed dark green leaves. Small catkin-like, greenish white flowers in long racemes. Height 3-5m. moist well-drained soil in sun. Jul.-Sep. | |
| Itea | virginica | "Henrys' Garnet" | A deciduous shrub with upright racemes of fragrant white flowers in July. Outstanding coppery-red Autumn colours. Height 2-3m. Moist lime-free soils in sun or part shade. |