Roscoea Final Report - RHSapps.rhs.org.uk/planttrials/TrialReports/Roscoea 2011.pdf · 2012. 7. 3. · Roscoea Trial No. 1436 3 R. auriculata ‘Summer Deep Purple’ AGM (H4) 2011

Roscoea Trial 1436 1

TRIAL REPORT

2008-2011

Roscoea

Trials Office The Royal Horticultural Society Garden, Wisley, Woking, Surrey, GU23 6QB

Roscoea Trial No. 1436 2

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.


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.


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.


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.


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


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.


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.


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. rubra”.

R. purpurea 'Dalai Lama' AGM (H4) 2011 [trial entry: 79] Entered by: Beeches Nursery Foliage: Mid Green, yellower than N137A; Leaf features: Sheaths deep Red 187A-B, vertically ridged but not wrinkled, lightly glossy and lightly pruinose above; Peduncle: Stem and all but tips of floral bracts contained in constricted upper leaf sheath; Flower colour: Lip Pale Violet, lighter and brighter than N82D, deeper Purple Violet N81A-B and white streaks in throat, hood and lateral petals white flushed Violet N82, stigma hood white; Floral bract colour: Red 187A/B, green tipped, sheathes barely visible, green tipped. A strong grower. Lovely foliage and red stems, which make the plant attractive even when it is out of flower, giving it good garden value. Plenty of pale purple flowers produced later in the season.


R. wardii AGM (H4) 2011 (Subject to availability) [trial entry: 23] Entered by: RBG Kew Foliage: Yellow green, somewhat darker than (146A); Leaf features: Yellow green, bit darker than (146A); Peduncle: Stem barely protruding from leaves; Flower colour: New flowers very dark purple (79A), becoming paler and redder to (N79B), even paler in places; Floral bract colour: Green, red edged; calyx off white with red flush in places. The plants have relatively few leaves to flower. The flower is a superb deep colour and has a frilly labellum. Not the fastest to bulk up.

AGM’s to be rescinded: R. cautleyoides AGM (H4) 1993 It was concluded that the original AGM was not appropriate, as not all forms of this species were considered to be AGM worthy, and there were cultivars which truly stood out as superior clones. R. cautleyoides ‘Kew Beauty’ AGM (H4) 1998 The original AGM has been rescinded because the Panel concluded that the original designation as a R. cautleyoides was incorrect. The plant is thought to be a R. cautleyoides x R. humeana hybrid. The award has been re-made to this clone but under the altered name. R. humeana AGM (H4) 1993 It has been decided that the original AGM was not appropriate and AGM‟s to forms and cultivars were more beneficial. Also, not all forms of the species were included in the trial e.g. R. humeana f. alba , which alogh it is known to produce lovely flowers, it can die out after a few years. It is thought that it would probably be unwise to give f. alba an AGM around the table, and therefore because not all types of R. humeana were AGM worthy.


Honourable mentions: The following entries were thought to be good plants, of interest to people with a special interest in Roscoea or to anyone starting a collection or of these plants. R. capitata (Tn. 16) [Sender: RBG Kew] A long flowering period. Very distinctive species because of the interesting inflorescence structure, which makes the plant more decorative. Lovely deep purple flowers. Slightly slower to increase than many other entries. Not widely available.

R. cautleyoides purple-flowered (Tn. 54) [Sender: RBG Kew] Very distinctive leaf colour – glaucous foliage. The contrast between the silvery blue leaves and the purple flowers was much admired. Not as leafy as other R. cautleyoides, and doesn‟t clump up as fast. Known to set seed. A very attractive delicate plant. Not widely available.

R. purpurea ‘Brown Peacock’ (Tn. 78) [Sender: R Zijerveld] The most distinctive foliage of all the entries. Looks good out of flower because of the red underside of the leaves. The flowers were paler than other similar R. purpurea entries. The plant bulks up well.

R. purpurea ‘Wisley Amethyst’ (Tn. 91 & 95) [Senders: R Zijerveld & Hugh Nunn] A plant that originated at RHS Wisley on Battleston Hill. It will flower much better in more shady positions than other entries. Unusual and striking flowers, which have distinctive purple markings on the white flowers. An early flowering form of R. purpurea.


R. ganeshensis (Tn. 63) [Sender: RBG Kew] The plant is liked because of its beautiful crinkly lip which is reminiscent of crumpled tissue paper. Although the plant did well, it did not bulk up very fast, and overall was not considered to be AGM standard, but it‟s interesting flower texture and the fact that it is the last Roscoea to flower make it interesting. The species was collected by Bill Baker in 1992; he also collected R. purpurea rubra

on the same trip. (Not available).

Trial Notes: Objectives:

To assess a range of currently available Roscoea species and cultivars

To recommend the Award of Garden Merit [AGM] to taxa considered excellent for ordinary garden use.

To determine correct nomenclature

To produce a permanent record through herbarium specimens, photographs and written descriptions for the RHS Herbarium at Wisley.

Entries:

There are 102 entries in the trial, submitted by various individuals and nurseries in the UK and Europe, the National Plant Collection Holder of Roscoea and The Royal Botanical Gardens, Kew.

Cultivation: Roscoea prefer a cool site, preferably a north-facing slope (giving afternoon shade to keep their roots cool in the summer). Excessive woodland conditions are not required, however, a generous root-run and a good quantity of humus in the soil is essential to keep the roots damp during the summer. Planting took place on 7th April and the beds were then top-dressed with up to 2.5cm (1") of fine bark chippings.

Picture: A large rhizome of R. auriculata. The rhizomes should be kept in damp compost to prevent them drying out whilst being moved / transferred.

Picture: The entries being planted in the raised beds at Wisley, with the bark chipping mulch being applied over the top.


The best time to move Roscoea is in the autumn when the foliage has died right down and the plants are dormant rhizomes. It is possible to move the plants when they are in leaf, after they have finished flowering. To do this plenty of soil around the plant should be lifted with them and not shaken off, so that the rhizome is protected and does not dry out. The plants should then be planted again as quickly as possible.

The plants were planted in raised beds on the Trials Field to ensure that the plants did not become water-logged in winter. It was recommended that the soil be humus-rich and that a pH of 6 should be aimed for. A mulch of fine bark was applied to the surface of the soil to keep the roots damp during the summer months, and also to help maintain acidic soil conditions and provides additional protection from winter cold. The Roscoea proved to be very hardy, surviving two successive harsh winters.

Picture: R. × humeana 'Harvington Royale', demonstrating the triangular planting.

Three plants of each entry were grown in triangular blocks 30cm apart each way, with 45cm between entries. Smaller rhizomes were planted 10cm deep and larger rhizomes 15cm deep.

The plants were dead headed to prevent seeding. Greenfly and slugs can attack new growth, and so were controlled as necessary and a watch was kept for virus infection. It was found necessary to erect some net shading over the plants in the height of summer to prevent them from scotching and wilting in the mid day and afternoon heat. The dappled shade was intended to replicate that of a woodland setting – their natural habitat. Some watering was also necessary.

Picture: The shade used to create the dappled light – mimicking the woodland environment. Picture: R. 'Summer Deep Purple' – in the partial shade created to protect the plants in the height of summer.


Judging:

The Rock Garden Plant Trials Subcommittee will assess entries in the trial for the Award of Garden Merit using the following criteria:

Ease of cultivation : hardiness : reliability : floriferousness

Three genus specialists were co-opted for assessment of the Roscoea. They provided value information about the origins and correct nomenclature of the entries;

Roland Bream (National Plant Collection Holder of Roscoea) Jill Cowley (author of The Genus Roscoea) Richard Wilford (Collections Manager, Hardy Display Section, RBG Kew).

Colin Crosby, Garden Manager of Wisley, was also invited to attend the meetings, as he is a keen Roscoea and Rock Garden Plant enthusiast. The Subcommittee were very grateful for his contributions. Findings: Throughout the trial R. cautleyoides was found to be very variable, and this is also seen in the wild. There were many discussions as to whether all variations were good enough to warrant the award of AGM. The entries which were named R. x beesiana Gestreept Group and the ones which were reported to have white flowers, all appeared to be similar and highly variable. It was noted that the flower colour varied from year to year and was temperature dependant (more purple in 2010 and more cream in 2011). The flowers were variable even on the same plant. A selection of flowers is shown below; ranging from the ones which are very purple and flecked with cream, to those that are almost entirely pure cream.

Although the Roscoea were hardy, the prolonged cold weather during the early part of 2010 meant that the plants were delayed in their emergence, and then can be held back with their flowering as well. Heavy rain can damage Roscoea. As they are naturally best grown in shaded areas, they are usually protected from the rain by trees. Rain can cause the flowers to go soggy, and for taller plants, the stems to bend. Hot weather will cause the plants to come into flower quickly, and can also cause the plants to finish flowering quickly. Shade and moisture will allow the plants to flower at their best for the longest season possible. The two entries that were found to be in particular need of shade were #63 (R. ganeshensis) and #88 (R. purpurea f. rubra). Later flowering entries were more prone to heat and water stress, as they flowered during the peak of summer when it was dry and hot. R. purpurea and R. auriculata both have better flowers when they have better growing conditions i.e. more water and shade. In the sun they can


suffer and produce few flowers. The shading was used in the trial to represent the conditions the plants should be grown in, as there was not a suitable wooded site that could be used for the trial. The plants however, can survive heat stress, and in July 2010 were surviving temperatures exceeding 30oC. Roscoea are often grown in a woodland setting, but are also happy in partial sun, or even full sun in cooler parts of the country. They like plenty of water when growing, but keep them drier during their winter dormancy to prevent them rotting. You can also grow them successfully in containers. Additional Information: Roscoea purpurea f. rubra versus „Red Gurkha‟:

purpurea f. rubra

Until 1994, the known colour range of Roscoea flowers included whites, purples, pinks and yellows. Then, an expedition to the Ganesh Himal in central Nepal made an exciting discovery – a form of Roscoea purpurea with bright red flowers. In their native Nepal they are known as rasagari and the rhizomes are used as a tonic. The name „Red Gurkha‟ was originally given to these plants but the variability of plants under this name, particularly in the colour of the leaf sheath, has led the RHS Advisory Committee on Nomenclature and Taxonomy (ACONAT) concluded that it is best treated as a synonym of “f. rubra”.

As Roscoea are increasing in popularity, new cultivars are being introduced onto the market, as more clones and species are becoming increasingly readily available in the trade. The popularity of R. purpurea f. rubra is already providing exciting new breeding opportunities, many of which were too recently introduced to be included in the trial. One such example is R. „Royal Purple‟. An example which was in the trial was R. „Raspberry Ripple‟, a hybrid of R. cautleyoides × R. purpurea f. rubra.

Picture: Two hybrids with R. „purpurea f. rubra in its parentage. Left: R. „Raspberry Ripple‟. Right: R. „Royal Purple‟ (picture courteous of P. Erskine).


Visit to the National Collection of Roscoea 17th August 2011: On the 17th August, Roland and Gay Bream kindly invited the Rock Garden Trials Assessment Panel to visit their National Collection of Roscoea. The collection consists of over 95 taxa, which are a mixture of species, hybrids and different cultivars. They are either scattered throughout the garden, planted under fruit trees, or in pots. Roland reported that his collection did very well in pots, and were very hardy, even in the winter 2010 – spring 2011, when temperatures reached -17oC, the plants survived well. Roland reported that the only species that he did have trouble with, that proved to be fussier about its conditions and slightly less hardy than most was R. ganeshensis. Roland explained how he had become interested in the genus. When ordering plants from a catalogue, he decided to try something different that he had never tried before. The yellow flowers of R. „Kew Beauty‟ caught his eye in the catalogue. The following summer the plant successfully came up and continued to do well in his garden. Encouraged, Roland then tried other species as he came across them, and gradually became fascinated with the genus. Further reading: For more information of the Genus, as well as cultivation notes, please see the monograph by Jill Cowley. The Genus Roscoea (Kew Botanical Magazine Monograph). ISBN-10: 1842461346


Flowering times:

Picture: These are the approximate flowering times for the different Roscoea species, with some example cultivars to show significant variations. The plants are listed in order of flowering. These are an amalgamation of the data collected in 2010 and 2011. The flowering times in 2010 were almost 2 weeks later than expected for the earlier flowering types (e.g. R. cautleyoides and R. humeana) as a result of the harsh winter, but this difference was lessened to a few days by the time entries such as the later flowering R. purpurea and R. ganeshensis come into bloom. Some plants will continue to flower into September, but the flower production will slow as the temperature starts to drop rapidly.


Trial Entries:

Trial No. Award Plant Name Sender 1 R. schneideriana RBG Kew 2 R. scillifolia forma atropurpurea Broadleigh Gardens 3 R. scillifolia forma atropurpurea Hopleys Plants Ltd 4 R. scillifolia forma scillifolia R Zijerveld 5 R. scillifolia deep purple forma scillifolia Beeches Nursery 6 R. scillifolia pink-flowered forma scillifolia RBG Kew 7 R. scillifolia pink-flowered forma scillifolia Mary Green 8 R. sinopurpurea tibetica Beeches Nursery 9 R. tibetica Flowers by Design 10 R. tibetica RBG Kew 11 R. alpina RBG Kew 12 R. alpina Proper Plants 13 R. alpina R Zijerveld 14

R. alpina purple-flowered R. scillifolia forma scillifolia Broadleigh Gardens

15 R. australis RBG Kew 16 R. capitata RBG Kew 17 R. auriculata 'White Cap' R Zijerveld 18 R. auriculata RBG Kew 19 R. auriculata R Zijerveld 20 R. auriculata Avon Bulbs 21 R. auriculata 'Favourite' R Zijerveld 22 R. auriculata 'Floriade' R Zijerveld 23 R. wardii RBG Kew 24 R. brandisii tumjensis B Mathew 25 R. tumjensis RBG Kew 26 R. tumjensis 'Purple Giant' R Zijerveld 27 R. tumjensis 'Purple Giant' Beeches Nursery 28 R. 'Beesiana' x beesiana Gestreept Group Avon Bulbs 29 R. 'Beesiana' x beesiana Gestreept Group Broadleigh Gardens 30 R. 'Beesiana' x beesiana Gestreept Group Bressingham Gardens 31 R. 'Beesiana' x beesiana Gestreept Group R Zijerveld 32

R. 'Beesiana' white-flowered x beesiana Gestreept Group R Zijerveld

33

R. 'Beesiana' white-flowered x beesiana Gestreept Group Beeches Nursery

34 R.'Monique' auriculata Beeches Nursery 35

R. cautleyoides × R. purpurea 'Red Gurkha' „Raspberry Ripple‟ B Mathew

36 AGM (H4) 1993 R. cautleyoides Broadleigh Gardens 37 AGM (H4) 1993 R. cautleyoides Proper Plants 38 AGM (H4) 1993 R. cautleyoides Avon Bulbs 39 AGM (H4) 1993 R. cautleyoides Bressingham Gardens 40 R. cautleyoides 'Jeffrey Thomas' Sampford Shrubs 41 R. cautleyoides 'Jeffrey Thomas' R Zijerveld 42 R. cautleyoides 'Early Yellow' R Zijerveld


Trial No. Award Plant Name Sender 43 R. cautleyoides 'Himalaya' R Zijerveld 44 R. cautleyoides 'Betty Farquar' RBG Kew 45 R. cautleyoides Kew dwarf-form „Abigail Bloom‟ Bressingham Gardens 46 AGM (H4) 1998 R. cautleyoides 'Kew Beauty' syn.'Grandiflora' RBG Kew 47 AGM (H4) 1998 R. cautleyoides 'Kew Beauty' Beeches Nursery 48 AGM (H4) 1998 R. cautleyoides 'Kew Beauty' Bressingham Gardens 49 R. cautleyoides mauve-flowered (CLD 1050) B Mathew 50 R. cautleyoides 'Paars' „Purple Queen‟ R Zijerveld 51 R. 'Purple King' cautleyoides purple-flowered R Zijerveld 52 R. 'Purple King' cautleyoides purple-flowered Beeches Nursery 53 R. cautleyoides purple-flowered „Purple Queen‟ Beeches Nursery 54 R. cautleyoides purple-flowered RBG Kew 55 R. cautleyoides 'Reinier' R Zijerveld 56 R. cautleyoides 'Vanilla' Mary Green 57 R. cautleyoides 'Vanilla' R Zijerveld 58 R. cautleyoides 'Vanilla Ice' R Zijerveld 59 R. cautleyoides 'Vien Beauty' Roland Bream 60 R. cautleyoides 'Yeti' R Zijerveld 61 R. cautleyoides var. cautleyoides RBG Kew 62 R. forrestii B Mathew 63 R. ganeshensis RBG Kew 64 AGM (H4) 1993 R. humeana f. humeana RBG Kew 65 R. humeana australis Sampford Shrubs 66 AGM (H4) 1993 R. humeana Broadleigh Gardens 67 R. humeana ex. 11W Bressingham Gardens 68 R. humeana ex. 39 „Stephanie Bloom‟ Bressingham Gardens 69 R. humeana ex.11E Bressingham Gardens 70 R. humeana f. tyria 'Inkling' Inkling Group B Mathew 71 R. humeana f. tyria 'Inkling' Inkling Group RBG Kew 72 R. humeana f. lutea RBG Kew 73 R. humeana yellow B Mathew 74 R. praecox RBG Kew 75 R. purpurea „Helen Lamb‟ Avon Bulbs 76 R. purpurea RBG Kew 77 R. purpurea R. auriculata Proper Plants 78 R. purpurea 'Brown Peacock' R Zijerveld 79 R. purpurea 'Dalai Lama' Beeches Nursery 80 R. purpurea 'Nico' R Zijerveld 81 R. purpurea 'Niedrig' „Red Neck‟ Beeches Nursery 82 R. purpurea 'Neidrig' „Red Neck‟ R Zijerveld 83 R. purpurea 'Peacock' R Zijerveld 84 R. purpurea 'Peacock Eye' R Zijerveld 85 R. purpurea 'Procera' R. auriculata R Zijerveld 86 R. purpurea 'Red Foot' R Zijerveld 87 R. purpurea f. rubra RBG Kew 88 R. purpurea f. rubra 'Red Gurkha' BBMS43 RBG Kew 89 R. purpurea 'Twin Towers' R Zijerveld 90 R. purpurea 'Vincent' R Zijerveld


Trial No. Award Plant Name Sender 91 R. purpurea 'Wisley Amethyst' Proper Plants 92 R. purpurea early-flowering „Summer Deep Purple‟ Bressingham Gardens 93 R. purpurea late-flowering auriculata Bressingham Gardens 94 R. purpurea 'Heronswood Lady' Flowers by Design, 95 R. purpurea 'Wisley Amethyst' Hugh Nunn 96 R. 'Summer Deep Purple' Hugh Nunn 97 R. × humeana 'Harvington Raw Silk' Hugh Nunn 98 R. × humeana 'Harvington Royale' Hugh Nunn 99 R. 'McBeath's Pink' Hugh Nunn 100 AGM (H4) 1993 R. cautleyoides Hugh Nunn 101 R. cautleyoides 'Early Form' Hugh Nunn 102 R. „Pennine Purple‟ Hartside Nursery

Garden

Addresses of Senders Avon Bulbs Ltd, Burnt House Farm, Mid Lambrook, South Petherton, Somerset TA 13 5HE

Beeches Nursery, Village Centre, Ashdon, Saffron Walden, Essex CB10 2HB

Bressingham Gardens, Bressingham, Diss, Norfolk PI22 2AB

Mr R Bream, National Plant Collection Holder, Stevenshill, Harnage, Shrewsbury, Shropshire SY5 6EG

Broadleigh Gardens, Bishops Hall, Taunton TA4 1AE

Flowers By Design, 12 Roman Row, Whichford, Shipston on Stour, Warwickshire CV36 5PJ

Hopleys Plants Ltd, High Street, Much Hadham, Herts SG10 6BU

Hugh Nunn, Orchard Close Nursery, 71 Village Street, Harvington, Evesham, Worcestershire WR11 8NQ

Mary Green, The Walled Garden, Off Monteagle Drive, Hornby, Lancaster LA2 8LD

Mr B Mathew, c/o Trials Office, RHS Garden Wisley, Woking, Surrey GU23 6QB

Proper Plants, Penknight, Lostwithiel, Cornwall PL22 OJD

Royal Botanic Garden Kew, Richmond, Surrey TW9 3AB

Sampford Shrubs, Sampford Peverell, Tiverton, Devon EX16 7EN, UK.

Mr R Zijerveld, Turfspoor 180, 2165AX Lisserbroek, The Netherlands

With thanks to the members of the Rock Garden Plant Trials Assessment Panel for their time and expertise: M. Randall (Chairlady) P. Erskine (Vice Chairman) J. Amand R. Bathe J. Bishop C. Brickell R. Drew

A. Edwards T. Hall B. Mathew J. McGregor M. Sheader M. Upward


Source: Trials Office, The Royal Horticultural Society Garden, Wisley, Woking, Surrey GU23 6QB

e-mail: [email protected]. More information about RHS Trials and other colour illustrated reports can be found on the RHS Website : http://www.rhs.org.uk/Plants/Plant-trials-and-awards

mailto:[email protected]

http://www.rhs.org.uk/Plants/Plant-trials-and-awards

Documents

Roscoea Final Report - RHSapps.rhs.org.uk/planttrials/TrialReports/Roscoea 2011.pdf · 2012. 7. 3. · Roscoea Trial No. 1436 3 R. auriculata ‘Summer Deep Purple’ AGM (H4) 2011