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Roscoea Final Report

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Roscoea Final Report TRIAL REPORT 2008-2011 Roscoea Trials Office The Royal Horticultural Society Garden, Wisley, Woking, Surrey, GU23 6QB Roscoea Trial 1436 1 Trial of Roscoea 2008-2011 Entries receiving The Award of Garden Merit (H4) R. auriculata AGM (H4) 2011 [trial entries: 17, 18, 19, 20, 21, 22, 34, 92, 96] Entered by: R Zijerveld, RBG Kew, Avon Bulbs, Beeches Nursery, Bressingham Gardens and Hugh Nunn Foliage: Mid green (137A); Leaf features: Sheaths green, heavily vertically corrugated; Peduncle: Hidden in bracts; Flower colour: Lips purple (N82A), hood and lateral petals slightly paler, staminodes white mottled purple; Floral bract colour: Green, calyx white flushed purplish red toward tip, pale yellow green on edges to tip. The variation between these plants was small and within the group there were no poor plants. Good value plants that are vigorous and produce plenty of flowers over a long period. Roscoea Trial No. 1436 2 R. auriculata ‘Summer Deep Purple’ AGM (H4) 2011 [trial entry: 92 & 96] Entered by: Bressingham Gardens and Hugh Nunn Lots of lush growth and tall for an R. auriculata. Vigorous and bulks up quickly and could need fairly regular division, to prevent the plant keeling over when it gets overcrowded. Produced a lot of flower over a long period. A great garden plant. R. x beesiana AGM (H4) 2011 [trial entries: 28, 29, 30, 31, 32, 33] Foliage: Mid Green (N137A), thin dark red hyaline edge, especially to lower half of leaves and ligule; Leaf features: Sheaths green with red hyaline seam along back, heavily vertically corrugated; Peduncle: Green, glabrous; Flower colour: Very pale yellow, (paler than 1D), some flowers almost white with dull purple (N79D) splashing, this darkest on lips, yellower flowers with just a hint of purple in places; Floral bract colour: Green, red edged and tipped, calyx dull yellow flushed red, strongest at base and tips. The flower colour can vary from season to season and between clones. It will be covered in flower for a long time. The plants will bulk up well. Will continue to look good even in hotter periods when other Roscoea are starting to suffer. R. cautleyoides 'Himalaya' AGM (H4) 2011 [trial entry: 43] Entered by: R Zijerveld Foliage: Yellowish green, bit darker than 146A on lower leaves; Leaf features Sheaths green, glaucescent on lower leaf undersides and sheaths; Peduncle: Green, glaucescent; Flower colour: Pale Yellow (2D), veins and throat slightly darker (2C); Floral bract colour: Bracts and calyx green. Produces a substantial amount of flowers which are slightly paler than other types of R. cautleyoides. Roscoea Trial No. 1436 3 R. cautleyoides 'Jeffrey Thomas' AGM (H4) 2011 [trial entries: 40 & 41] Entered by: Sampford Shrubs and R Zijerveld Foliage: Mid green (N137A); Leaf features: Leaves and sheaths slightly glaucescent. Sheaths green; Peduncle: Green, glaucescent; Flower colour: Lip very pale yellow (4A) veined slightly darker yellow, hood and wings flushed yellow (4B), throat yellow (5C); Floral bract colour: Bracts green flushed red (187C) in upper half; calyx greenish yellow flushed red. A very strong growing and floriferous cultivar, and one of the earliest types of Roscoea to flower. R. cautleyoides ‘Abigail Bloom’ entered as “Kew Dwarf form” AGM (H4) 2011 [trial entry: 45] Entered by: Bressingham Gardens Foliage: Mid green (N137A); Leaf features: Sheaths greyish green, dull. Red tinging at base of lowest sheath; Peduncle: Not emerging from leaf sheaths; Flower colour: Very pale yellow, (paler than 1D), slightly stronger yellow in throat and hood; Floral bract colour: Green tipped greyed red, Calyx greenish, tinged red. A lovely compact plant – like a smaller ‘Kew Beauty’. All the flowers open at once producing an outstanding display, which also means that it doesn’t look untidy alter, unlike many other cultivars. R. forrestii AGM (H4) 2011 [trial entry: 62] Entered by: B Mathew Foliage: Mid green, (yellower than 137A); Leaf features: Sheaths green, striate; Peduncle: Stems hidden by foliage/sheaths; Flower colour: Pale yellow (2C); Floral bract colour: Bracts green, pale with red tinged sheaths. A distinctive species. Currently there is only one clone of this species in cultivation. Produces distinctive bunches of inflorescences. The flowers are a lovely colour. Roscoea Trial No. 1436 4 R. humeana f. lutea AGM (H4) 2011 [trial entry: 72] Entered by: RBG Kew Foliage: bright green; Leaf features: Broad leaved, sheaths green; Peduncle: Not exerted from the bracts; Flower colour: Pale yellow (2C); Floral bract colour: pale green, whitish at base, much shorter than the calyx. Calyx: green, yellowish at apex. The plants produce a lot of flower in a short burst of activity. The large curved dorsal hood gives the flowers a distinctive shape. R. humeana f. tyria AGM (H4) 2011 [trial entry: 71] Entered by: RBG Kew Foliage: Mid green (N137A); Leaf features: Broad-leaved, sheaths green; Peduncle: Not emerging from leaf sheaths; Flower colour: Dull deep purple, similar to (N79A-B) but containing purple (77A), some white in staminodes and blotches at top of split lips/throat; Floral bract colour: Bracts green, slightly pruinose, Calyx greyish green lightly flushed red. Lovely dark purple flowers. Clumps up well and ‘is a good doer’. Can be successfully raised from seed. Makes a beautiful pot plant. Roscoea Trial No. 1436 5 R. purpurea ‘Red Neck’ AGM (H4) 2011 Entry submitted as „Niedrig‟. [trial entries: 81, 82] Entered by: Beeches Nursery and R Zijerveld Foliage: Mid green, (yellower than 137A); Leaf features: Sheaths green strongly flushed deep red brown (183B), vertically ridged, wrinkled in places; Peduncle: Stem and all but tips of floral bracts contained in constricted upper leaf sheath; Flower colour: Hood purple (N81A) throat of lip and lateral petals striately flushed (N81A), lip and staminodes much paler Purple 76B; Floral bract colour: Green flushed red, Calyx not visible. A dainty R. purpurea cultivar. The leaves have distinctive ‘piping’ running along them, and the stems a mahogany tone. The light coloured labellum and dark hood make for very eye-catching flowers. R. 'Harvington Raw Silk' AGM (H4) 2011 [trial entry: 97] Entered by: Hugh Nunn Foliage: Yellow green, brighter and greener than (146A), red tinged at edges; Leaf features: Sheaths strongly tinged red (183A); Peduncle: Stem not protruding above sheathing leaves; Flower colour: Ground colour pale purple (76C) but flushed purple (N81C to N81B), especially on lip and standard; Floral bract colour: Red; calyx greyed red (180C). Beautiful pink bracts surround the buds which open to cream flowers. Bulks up well and produce a lot of flowers. H4 - hardy throughout the British Isles Roscoea Trial No. 1436 6 AGM’s to be reconfirmed: R. 'Kew Beauty' AGM (H4) 2011 [trial entries: 46, 47, 48] Entered by: RBG Kew, Beeches Nursery and Bressingham Gardens A vigorous plant which has lovely flowers. A very popular cultivar. Originally thought to be a R. cautleyoides, it is now thought that it is R. cautleyoides x R. humeana hybrid. AGM’s subject to Naming / Availability R. cautleyoides ‘Purple Queen’ AGM (H4) 2011 (Subject to availability) [trial entries: 50, 53] Entered by: R Zijerveld and Beeches Nursery Foliage: Yellow green (146A); Leaf features: Lightly glaucescent, lowest sheath with narrow red tinted hyaline margin; Peduncle: Green. terete; Flower colour: Dull purple (N78/N77B), older flowers (N77C). Yellow (11C) patches at top of lip; Floral bract colour: Bracts green tinged grey, flushed red in places; calyx greeny grey. A more shade loving cultivar, it is the best of the purple flowered R. cautleyoides. These often start to flower 7-10 days before the yellow R. cautleyoides. R. humeana ‘Stephanie Bloom’ AGM (H4) 2011 (Subject to availability) [trial entry: 68] Entered by: Bressingham Gardens Foliage: Mid green, (somewhat yellower than N137A); Leaf features: Leaves short, strongly sheathing flowers. Sheaths green, lowest tinged reddish grey; Peduncle: Not emerging from leaf sheaths; Flower colour: Rich purple, (darker than 77A), some white in staminodes and blotches at top of split lip/throat; Floral bract colour: Bracts green; calyx dirty white flushed purple and yellow green. A very floriferous cultivar that increases well, and will look wonderful for a good length of time. A distinct and lovely plant. Roscoea Trial No. 1436 7 R. 'McBeath's Pink' AGM (H4) 2011 (Subject to availability) [trial entry: 99] Entered by: Hugh Nunn Foliage: Yellow green, (brighter and greener than 146A), red-tinged at edges; Leaf features: Sheaths strongly tinged red (183A); Peduncle: Stem not protruding above sheathing leaves; Flower colour: Ground colour pale purple (76C) but flushed purple (N81C to N81B), especially on lip and standard; Floral bract colour: Red; calyx greyed red (180C). A very early and attractive cultivar. The best pink colour in the trial. Bulked up reasonably well. Will also grow well and come true from seed. (Will be available in 2-3 years). R. humeana f. humeana AGM (H4) 2011 (Subject to availability) [trial entry: 64] Entered by: RBG Kew The typical form of this species with a good length flowering season. Beautiful flowers of a distinctive purple. Roscoea Trial No. 1436 8 R. purpurea f. rubra (syn. 'Red Gurkha') BBMS 43 AGM (H4) 2011 [trial entry: 88] Entered by: RBG Kew Foliage: Mid green (137B); Leaf features: Sheaths greyed red (180A), vertically ridged and wrinkled; Peduncle: not emerging from leaf sheaths; Flower colour: Red-orange (N35A), lip paler orange (N34C); Floral bract colour: Floral bracts red edged green, calyx is shorter than the bract. A moisture and shade loving form, Variants of R. purpurea f. rubra differ in having red or green leaf sheaths and there are also some plants which are intermediate in this character. The name 'Red Gurkha' has been applied to red- flowered examples of R. purpurea regardless of leaf sheath colour. The RHS Advisory Committee on Nomenclature and Taxonomy (ACONAT) concluded that because of the variation encompassed by the name it was best treated as a synonym of “f.
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