AGM
Final Report for Trial of Dahlia 2010 The following entries were given the Award of Garden Merit (H3) following assessment of the 2010 trial: Dahlia 'Keith's Pet' AGM for use in containers (H3) 2010 (Single, Dwarf Bedder) Registered 2010 Trial no: 1 – grown in containers Raised by: K Hammett Sent to trial by: Mr J Wheatley, Stonebarn, Moorledge Farm, Chew Magna, Bristol, Avon, BS40 8TL Available from: The National Collection of Dahlias, Winchester Growers Ltd, Varfell Farm, Long Rock, Penzance, Cornwall TR20 8AQ www.national-dahlia–collection.co.uk Description: Plant height 75cm. Flowers 5.5cm in diameter, outer florets flat, white with a small area of yellow-green (1A) at the base. Central disc vivid yellow (12A). Foliage dark green with bronze veining. Stems bronze and round in section. Assessment Panel comments: Lovely colour contrast with the dark foliage and white flowers. Small, pretty flowers. The flowers look as good from the front as the back, giving a good overall appearance - very good for containers. Flowers held well above the foliage and some low down. Good shape plant.
Dahlia 'Exotic Dwarf' AGM for use in containers (H3) 2010. N.B. Has an existing AGM for the open ground (H3) 2009. (Single, Dwarf Bedder) Registered pre-1969 Trial no: 12 – grown in containers Raised by: Nuyens Sent to trial by and available from: Mr W Gott, Sunnyside, Woodhouse Lane, Milnthorpe, Cumbria, LA7 7EW. Also listed in the RHS Plant Finder as available from Beeches Nursery, Cottage Nurseries, Wisley Plant Centre, Garden House Nursery, Halls of Heddon, Walled Garden Nursery, Cotswold Garden Flowers Description: Plant height 57cm. Flowers 4.5cm in diameter, outer florets flat, pale pink-purple (75A-75B) with deep purplish red at the base (61A). Central disc vivid yellow (14A). Foliage green (137A). Stems light green, lightly tinged with bronze and round in section.
Final Report for Trial No. 1889 – Dahlias 2010
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Assessment Panel comments: Domed foliage with flowers held nicely above the foliage. A very good container plant and a perfect shape for containers. Has an incredible amount of flower. The very good, clear pink flowers hold their colour well. A good all round plant for both a bed and container.
Dahlia 'My-nute Blend' AGM for use in containers (H3) 2010 Group 10 (Lil.) Registered 2016. Trial no: 23 – grown in containers Raised by and sent to trial by: The Late Mr D Walker Description: Plant height up to 70cm. Flowers 5cm in diameter. Outer florets short, narrow and cupped, orange 33C, with brilliant greenish yellow 3A at base. Inner florets red (34A), clustered around the vivid yellow 13A disc florets. Leaves mid-green (a bit yellower than 137B), lighter green beneath. Stems 0.3m light green, lightly tinged with bronze, round in section. Assessment Panel comments: Masses of blooms, very floriferous. The plants are well covered with flowers all the way round. The flowers are held well above the foliage. Flowers change colour as they age, and compliment the colour of the younger flowers. Good habit for a container.
Dahlia 'Blyton Softer Gleam' for use in the open ground (H3) 2010. (Small Ball) Registered 2010 Trial no: 34 - grown in the open ground Raised by and sent to trial by: Mr L Stothard, 88A High Street, Blyton, Gainsborough, Lincolnshire, DN21 3LA Available from: Halls of Heddon, West Heddon Nursery, Heddon-on-the-Wall, Northumberland, NE15 0JS. Also available from Geerlings Dahlias, Kadijk 38, 2104AA Heemstede, Netherlands Final Report for Trial No. 1889 – Dahlias 2010
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Description: Plant height 1.7m. Flowers 10cm in diameter. Outer florets and inner florets orange, with vivid yellow (12A) at base. Foliage green (N137A). Stems light green, lightly tinged with bronze and round in section. Assessment Panel comments: Nice even, healthy plants. Excellent stems. Flowers clear of foliage. Colour combination is spot on. Lovely buds, opening flowers and open flowers. Flowers at top of plants, not at the base – would make a good back of the border plant.
H3 = plants hardy outside in some regions or in particular situations or which, whilst usually grown outside in summer, need frost-free protection in winter.
Final Report for Trial No. 1889 – Dahlias 2010
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The following entries have been recommended for the AGM but cannot receive the award until they have been registered and / or are available to the public. It is the responsibility of the sender to inform the Trials Office at Wisley that all queries have been resolved. Subject to Availability Dahlia 'Gallery La Tour' AGM for use in containers (H3) 2010. N.B. Has an existing AGM subject to availability for the open ground (H3) 2009. (Small Decorative) Registered 2010 Trial no: 13 – grown in containers Raised by and sent to trial by: Verwer-Dahlias B.V., Fa Gebr Verwer, 3e Poellaan 73/75, 21 61 DL, Lisse, Netherlands Description: Plant height 64cm. Flowers 11cm in diameter, outer florets flat, very light purple (76C) with light purple (76A) veining. Inner petals incurved, greenish white (155C), tipped with light purple (80C). Innermost petals vivid reddish purple (78A). Assessment Panel comments: Masses of large flowers with unusual colouring. Dark foliage. Neat habit. A good size plant for a container. Flowers held above the foliage. Held its double flowers up well despite heavy rain. Superb. The flowers have very good centres.
Subject to Registration & Confirmation of Availability Dahlia 'Erna Panzer' AGM (H3) 2010 (Miniature Decorative – to be confirmed on registration) Trial no: 72 - grown in the open ground Raised by: H Panzer Sent to trial by: Deutsche Dalien, Fuschsien und Gladlolen, Gelsellschaft, Maasstrae 153, 47608 Geldern Walbeck, Germany Description: Plant height 1.55m. Flowers 11cm in diameter, outer florets and inner florets orange (31C), with brilliant greenish yellow (1A) at base. Back of the florets deep purplish pink (54B). Foliage green. Stems green (N137A), lightly tinged with purple and round in section. Assessment Panel comments: Masses of flowers. Amazing. The beautiful dark middle of the flowers contrasts well with the foliage.
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Subject to Registration and Confirmation of Availability Dahlia 'Hapet Fantastic' AGM (H3) 2010 (Large Semi-Cactus – to be confirmed on registration) Trial no: 42 - grown in the open ground Raised by: P Hasilhofer Sent to trial by: Deutsche Dalien, Fuschsien und Gladlolen, Gelsellschaft, Maasstrae 153, 47608 Geldern Walbeck, Germany Description: Plant height 2.2m. Flowers 15cm in diameter, outer and inner florets vivid red (52A) with brilliant greenish yellow (1A) at the base. Foliage dark green. Stems green (N137B), lightly tinged with purple. Assessment Panel comments: One of the tallest dahlias in the trial with a very upright habit. Very neat foliage. Lots of flowers held nicely above the foliage. Lovely colour. Stunning. Nice strong stems. An excellent plant for the back of a border.
Subject to Registration and Availability Dahlia 'Rockliffe Billy' AGM (H3) 2010 (Small Semi-Cactus – to be confirmed on registration) Trial no: 46 – grown in the open ground Raised by and sent to trial by: Mr T E Thompson, 4 Cae Coch Cottage, Kielsterton Road, Flint, CH6 5SJ
Description: Plant height 1.68m. Flowers 12cm in diameter, florets vivid reddish orange (N30A). Foliage dark green. Stems green (N137A) much tinged with purple and oval in section. Assessment Panel comments: A lovely colour combination with fantastic dark stems and foliage and bright orange-red flowers. Lots of attractive flowers. Good strong plants with strong stems. Flowers are held well above the foliage. Final Report for Trial No. 1889 – Dahlias 2010
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Trial Notes Objective: To assess, compare and demonstrate a range of cultivars, in the open ground, submitted by professional and amateur growers. Cultivation: To maintain entries in Trial for successive years, tubers are lifted and stored over winter. They are started into growth in mid February and when the shoots have reached 7.5cm in length they are removed as cutting material, making sure that the base of the cutting is taken just below a leaf node. Cuttings are rooted in modules of a peat free propagation mix, but most proprietary potting composts are equally suitable. Young plants can also be raised by placing several cuttings in a 15cm half-pot. The cuttings are kept under mist until they are rooted, usually in 14 to 21 days, and then potted up individually in 9cm pots. These are kept in a warm greenhouse under supplementary lighting until April. Cuttings are taken from these secondary mother plants in April in the same way as detailed above. Once rooted, these are potted up into 2 litre pots and grown under glass. The plants are "stopped", by removing the main growing tip, to promote bushy growth and are hardened off for 1-2 weeks ready for planting out in early June.
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Preparation and Planting: The dahlia is a very accommodating plant that will grow well in most types of soil. In autumn 2009 the site was dug over using a tractor mounted spader, no manure was added to the planting bed. The plot was rotovated in May 2010, prior to planting. The soil on the site was analysed in mid March and fertiliser was applied on 25th May 2010 in accordance with the RHS Soil Scientist's recommendations. Potassium was applied as sulphate of potash at 240g/m2 (9.3oz/yd2); magnesium was applied as kieserite at 160g/m2 (6.2oz/yd2); no phosphorous was required. Nitrogen was applied as a top dressing of ammonium sulphate at 65g/m2 (2.5oz/yd2). The fertilisers were raked into the surface of the soil. The dahlias were planted out on 16 June 2010. The container plants were not stopped after they were put outside. However the plants in the open ground were stopped on 18th June and again on 14th July to encourage the plants to bush out and hasten the development of the side branches that will bear the flowers. The plants grown at Wisley are cultivated for garden display and none were disbudded. Dahlias are mainly healthy plants but occasionally they do succumb to viral disease. Infected plants are removed and destroyed. Dahlias are liable to attack by a variety of pests - aphids, caterpillars and red spider mite, which can be troublesome from July onwards and require control by approved sprays. Dahlias are also susceptible to mildew and precautionary spraying is undertaken regularly. Dahlias need regular watering to obtain the best results and all of the plants had the benefit of a drip irrigation system. The entries were watered on planting and continued to be watered as necessary through the season. The container plants were fed through the irrigation system with a liquid feed once a week. A 3:1:1 fertiliser was used initially; this was changed to a
3:1:6 fertiliser in August. Entries: There were 80 cultivars planted in the open ground, and 25 entries in patio containers in this trial of dahlias which was assessed by the Floral Trials Assessment Panel in 2010. Records: A record was made of first flowering dates Findings: Although no disbudding took place this year, it was noted that disbudding can often improve the flowering display with a number of the Dahlia classifications. Judging: Members of the Floral Trials Assessment Panel inspected the trial at Wisley on the 10th & 24th August; 7th & 21st September and 7th October. The Trials Assessment Panel considered the plants using the following criteria: continuous flowering; disease resistance; earliness; quality of bloom; vigour; foliage Plants, Senders and Awards: AGM = Award of Garden Merit, given for use in the open ground unless specified otherwise H3 = Plants hardy outside in some regions or in particular situations or which, whilst usually grown outside in summer, need frost-free protection in winter. RFA = Referred for Further Assessment for the Award of Garden Merit
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Container Entries Please note that the larger dahlias (entry numbers 26-105) were planted in a separate bed further down the Trials Field. Entry Cultivar Number Container Plants 'Keith’s Pet' AGM (H3) 2010 for 1 use in containers Happy Single Princess 'HS 2 Princess' 'Golden Margarett' 3 'Golden Margaret' 4 'Knockout' Happy Single Kiss 'HS Kiss' 5 6 'Brighteyes Pathfinder' Happy Single Romeo 'HS Romeo' 7 Happy Single Flame 'HS Flame' 8 9 'Dark Desire' 10 Happy Single Party 'HS Party' 11 'Lilianna W' 'Exotic Dwarf' AGM (H3) 2009, AGM (H3) 2010 for use in 12 containers 13 'Gallery La Tour' 14 'Karma Choc' 15 'Melody Harmony' 16 'Maya' 17 'Valerie McDonald' 18 'Ruby Murray' 19 'Spanish Conquest' 20 'Melody Gipsy' 21 'Clarion' 22 'Petite Harvest' 23 'My-nute Blend' 'J.R.G.' AGM (H3) 2009 24 25 'Mayan Blood'
Sender
Raiser
J Wheatley
K Hammett
Verwer-Dahlias B.V.
Verwer-Dahlias B.V.
Geerlings
Maarse
Plantipp B.V. Young Plants Ltd J R Gott Young Plants Ltd Young Plants Ltd Avon Bulbs Young Plants Ltd J R Gott
K Hammett Verwer-Dahlias B.V. J R Gott Verwer-Dahlias B.V. Verwer-Dahlias B.V. A Street Verwer-Dahlias B.V. M Wilczynski
W Gott
Maarse
Verwer-Dahlias B.V. Verwer-Dahlias B.V. Verwer-Dahlias B.V. Verwer-Dahlias B.V. K Stock K Stock K Stock Verwer-Dahlias B.V. New World Plants Ltd J R Gott D Walker J R Gott K Stock
Verwer-Dahlias B.V. Verwer-Dahlias B.V. Verwer-Dahlias B.V. Verwer-Dahlias B.V. K Stock K Stock K Stock Verwer-Dahlias B.V. K Hammett J R Gott D Walker J R Gott K Stock
Name and Address of Senders to the Trial: Avon Bulbs, Burnt House Farm, Mid Lambrook, South Petherton, TA13 5HE Mr C Geerlings, Geerlings Dahlias, Kadijk 38, 2104AA Heemstede, Netherlands Mr J R Gott, 22 Summerville Road, Milnthorpe, Cumbria, LA7 7DF Mr W Gott, Sunnyside, Woodhouse Lane, Heversham, Milnthorpe, Cumbria, LA7 7EW New World Plants Ltd, Court Farm, Mansell Gamage, Herefordshire, HR4 7LE Plantipp BV, Brunel 21, 3401 LJ IJsselstein, Netherlands Mr K E Stock, c/o Trials Office. Plants from this sender are available from Gilberts Nursery, Dandysford Lane, Sherfieldenglish, Romsey, Hampshire, S051 6DT The Late Mr D Walker c/o Trials Office Mr J Wheatley, Stonebarn, Moorledge Farm, Chew Magna, Bristol, Avon BS40 8TL Verwer-Dahlias B.V., Fa Gebr Verwer, 3e Poellaan 73/75, 21 61 DL, Lisse, Netherlands Young Plants Ltd, Whitehill Farm, Alderminster, Stratford Upon Avon, Warwickshire, CV37 8BW
Large Dahlias with Support Frames Entry Cultivar Number 2 Anemone flowered 'Freya's Paso Doble' 26 AGM (H3) 2000 27 'Polka' Final Report for Trial No. 1889 – Dahlias 2010
Sender Winchester Growers Ltd J R Gott
Raiser
E van Dongen Unknown
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Planting number Cultivar Main bed 28 'Floorinoor' 7 Pompon 29 'Will's Ursula' 30 'Franz Kafka' 31 'Will's Ringwood Rosie' 6A Small Ball 32 'Charlie Briggs' 33 'Josie Gott' 'Blyton Softer Gleam' AGM (H3) 34 2010 35 'Blyton Royal Velvet' 6B Miniature Ball 36 'Casper' 37 'Wizard of Oz' 38 'Pembroke Levenna' 39 'Megan Dean’ Miniature Cactus 40 'Weston Stardust' 9B Large Semi-Cactus 'Susan Carey' All rogues, name 41 unknown 42 ‘Hapet Fantastic’ 9C Medium Semi-Cactus 43 'Ruskin Bride' 44 'Goldener Reiter' 9D Small Semi-Cactus 45 'Oakwood Goldcrest' 46 'Rockliffe Billy' 47 'Mayan Swan' 48 'Jessica' 49 'Kilburn Fiesta' 50 'Parkland Rave' 51 'Hapet Ideal' 11 Fimbriated 52 'Pinelands Pet' 53 'Normandie Blush' 54 'Ella Mae' 3 Collerette 'Trelyn Daisy' AGM (H3) 2008 55 56 'Abacus Sol' 57 'Carreg Cyril's Girl' 58 'Edith Jones' 59 'April Heather' 'Pooh – Swan Island' 60 AGM (H3) 2009 'Pat 'n' Perc' 61 INTEREST ONLY 62 'Olivia' 63 'Fontmell Kaz' 5C Medium Decorative 64 Seedling Ko212 65 'Stadt Spremberg' 5D Small Decorative 66 'Stevan's White' 67 'Wigo Super' 68 'Rossendale Rattle'
Final Report for Trial No. 1889 – Dahlias 2010
Sender
Raiser
Deutsche Dahlien
L Verhoeven
D G Williams J Wheatley D G Williams
D G Williams Maarse D G Williams
D Jones K Stock
D Kershaw K Stock
L Stothard
L Stothard
L Stothard
L Stothard
K Stock Winchester Growers Halls of Heddon Halls of Heddon
K Stock L J C W Berbee A G Davies Baldry
R Porter
T E McLelland
D McMaster
D McMaster
Deutsche Dahlien
P Haslhofer
F Taylor Deutsche Dahlien
S Pennington S Engelhardt
S Silver T E Thompson N Gilbert Geerlings G Hill J Wheatley G Carey
S Silver T E Thompson K Stock Hale G Hill Rowse P Haslhofer
E Collins E Collins R Knight
C O Higgo J Willott Unknown
R G Tudor Abacus Nurseries C Bright C Bright R Hedge Winchester Growers Ltd
R G Tudor D Hill C Bright I J Kitchener J Shaw
J R Gott
K Stock
J R Gott J R Gott
I Kitchener K Stock
Deutsche Dahlien Deutsche Dahlien
S Koschker S Koschker
R F Newberry Deutsche Dahlien D Kershaw
S Cox W te Winkel D Kershaw
N Gitts
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Planting number Main bed
Cultivar
'Karma Propsero' 'Karma Prospero' 5E Miniature Decorative 70 'Rossendale Lewis' 71 'My Neddy' 72 ‘Erna Panzer’ 73 'Tiptoe' 4 Waterlily 'Shep's Memory' 74 AGM (H3) 2006 75 'Rancho' 76 ‘Crystal Beauty’ 77 'Sandia Melody' 69
78
'Pam Howden'
79 'Blue Wish' 10 Miscellaneous 80 'Tally Ho Double' 81
'Kyoto'
Seedling Abacus 07/01 INTEREST ONLY 'Waltzing Mathilda’ 83 INTEREST ONLY 1 Single flowered 'Twyning's After Eight' 84 AGM (H3) 2004 85 'Miss Alison' 86 'Dovegrove' 87 'Honor Francis' Happy Single Wink 'HS Wink' 88 'Magenta Star' AGM (H3) 2008 89 Happy Single Date ‘HS Date’ 90 ‘Trelyn Grand Slam' All rogues 91 named 'Trelyn Crimson' 92 ‘Trelyn Red and Gold’ 93 'Twyning's Revel' Candy Eyes 'Zone Ten' 94 Single Orchid 'Honka' AGM (H3) 2000 95 96 ‘Trelyn Seren’ Double Orchid 'Mayan Pearl' AGM (H3) 2008 97 Demonstration of Dark Red Cultivars 98 'Chat Noir' 'Nuit d'Été' (sometimes incorrectly 99 called 'Summer Night') 100 'Pat Knight' 'Arabian Night' (syn. 'Arabian 101 Knight') 102 'Karma Naomi' 103 'Sam Hopkins' 104 'La Recoleta' Cosmos x Dahlia 'Mexican Black' 105 INTEREST ONLY 82
Final Report for Trial No. 1889 – Dahlias 2010
Sender
Raiser
Verwer-Dahlias B.V.
Verwer-Dahlias B.V.
D Kershaw N Gilbert Deutsche Dahlien Halls of Heddon
D Kershaw K Stock H Panzer T Cleghorn
P Godsmark
A Bunting
G Carey Geerlings Geerlings Station House Nurseries R & L Evans
E Turc Geerlings Birch Bay Dahlias
Bridgemere Nurseries Winchester Growers Ltd
Bridgemere Nurseries
Abacus Nurseries
D Hill
Rose Cottage Plants
Ru-Ro Plant
Winchester Growers Ltd RBG Kew J Wheatley O Mason J Wheatley J Wheatley Verwer-Dahlias B.V.
Davidson Unknown
Unknown
M Twyning A M G Smith K Hammett Unknown Verwer-Dahlias B.V. K Hammett Verwer-Dahlias B.V.
R Tudor
R G Tudor
R Tudor J Wheatley John Woods Nurseries
R G Tudor M Twyning K Hammett
Rose Cottage Plants R Tudor
Kieffer R G Tudor
K Stock
K Stock
Rose Cottage Plants
Unknown
Aylett Nurseries
Unknown
R Knight World's End Garden Nursery Verwer-Dahlias B.V. Geerlings Rose Cottage Plants Cotswold Garden Flowers
I J Kitchener Weijers Verwer-Dahlias B.V. C Geerlings Nuland Unknown
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Name and Address of Senders to the Trial: Abacus Nurseries, Drummau Road, Skewen, Neath. SA10 6NW Aylett Nurseries Ltd, North Orbital Road, St Albans, Herts, AL2 1DH Bridgemere Nurseries, Bridgemere, Nr. Nantwich, Cheshire, CW5 7QB Ms C Bright, Smithy House, Pant-Y-Garreg, Flint Mountain, Flintshire, North Wales, CH6 5QT Mr G Carey, 30 Dylan Avenue, Cefn Fforest, Blackwood, Gwent NP12 3NQ Mr E H Collins, 19 Sunnybank, Marlow, Bucks SL7 3BL Cotswold Garden Flowers, Sands Lane, Badsey, Worcestershire, WR11 7EZ. Deutsche Dalien, Fuschsien und Gladlolen, Gelsellschaft, Maasstrae 153, 47608 Geldern Walbeck, Germany Messrs R & L Evans, 3 Pentwyn Gowerton Road, Three Crosses, Swansea, SA4 3QH Mr C Geerlings, Geerlings Dahlias, Kadijk 38, 2104AA Heemstede, Netherlands Mr N Gilbert, Gilberts Nursery, Dandysford Lane, Sherfieldenglish, Romsey, Hampshire, S051 6DT Mr P Godsmark, Ryecroft Dahlias, 21 Spierbridge Road, Storrington, West Sussex RH20 4PG Mr J R Gott, 22 Summerville Road, Milnthorpe, Cumbria, LA7 7DF Halls of Heddon, West Heddon Nursery, Heddon-on-the-Wall, Northumberland, NE15 0JS Mr R Hedge, Grange Side, Cleveland Road, Worcester Park, Surrey, KT4 7QJ Mr G Hill, Coach House, Church Farm, Kilburn, York, YO61 4AH John Woods Nurseries, Main Road, Pettistree, Woodbridge, Suffolk, IP13 0HH Mr D Jones, 46 Hill Street, Blaenavon, Gwent, NP4 9EP Mr D Kershaw, 15 Hamer Avenue, Loveclough, Rossendale, Lancashire BB4 8QH Mr R Knight, Bogga Mill, Lanreath, Looe, Cornwall, PL13 2PA Mrs O Mason, Dial Park, Chaddesley Corbett, Kidderminster, Worcs, DY10 4QB Dr D McMaster, 20 Cabra Road, Hillsborough, Co Down, BT26 6NB Mr R F Newberry, Portal, Publow Lane, Pensford, Bristol, BS39 4HW Mr R Porter, 'Willowbrook', 58 Stanley Road, Halstead, Essex, CO9 1LA Ms L Hart, Hardy Display, RBG Kew, Richmond, Surrey, TW9 3AB Rose Cottage Plants, Bay Tree Farm, Epping Green, Essex, CM16 6PU Mr S Silver, 'Oakwood', 29 Thornhill, Chacombe, Banbury, Oxfordshire, OX17 2JG Station House Nurseries, Station Road, Burton, South Wirral, Cheshire CH64 5SD Mr K E Stock, c/o Trials Office. Plants from this sender are available from Gilberts Nursery, Dandysford Lane, Sherfieldenglish, Romsey, Hampshire, S051 6DT Mr L Stothard, 88A High Street, Blyton, Gainsborough, Lincolnshire, DN21 3LA Mr F B Taylor, Taylor's Dahlias, 12 Shawbury Grove, Sale, Cheshire M33 4DF Mr T E Thompson, 4 Cae Coch Cottage, Kielsterton Road, Flint, CH6 5SJ Mr R Tudor, 34 Victoria Road, Fleur de lys, Blackwood, Gwent NP12 3UG Mr J Wheatley, Stonebarn, Moorledge Farm, Chew Magna, Bristol, Avon BS40 8TL Mr D G Williams, 104a Woolsbridge Road, Ringwood, Hants BH24 2LZ Verwer-Dahlias B.V., Fa Gebr Verwer, 3e Poellaan 73/75, 21 61 DL, Lisse, Netherlands Winchester Growers Ltd, Varfell Farm, Long Rock, Penzance, Cornwall TR20 8AQ Worlds End Garden Nursery, Worlds End Nurseries, Moseley Road, Hallow, Worcester, WR2 6NJ Plant Trials Bulletin on Dahlias A colour trials bulletin was published in 2009 entitled “Open-centred Dahlias and can be downloaded from the RHS website using the following link www.rhs.org.uk/Plants/RHS-Publications/Plant-bulletins/Opencentred-Dahlias Alternatively if you would like a printed copy please contact: The Trials Office, RHS Garden Wisley, Woking, Surrey GU23 6QB. Please enclose an A4 SAE. They cost £2 per copy (a donation towards costs); cheques to be made out to Royal Horticultural Society.
Final Report for Trial No. 1889 – Dahlias 2010
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Dahlia Classifications Text Source: Nineteenth Supplement to The Tentative Classified List and International Register of Dahlia Names 1969 (2007). Photographs: RHS Trials
Group 1: Single–flowered dahlias Single outer ring of florets, which may overlap, the centre forming a disc. D. 'Moonfire'
Group 2: Anemone–flowered dahlias One or more outer rings of generally flattened ray florets surrounding a dense group of tubular florets, which are longer than the disc florets in Single dahlias, and showing no disc. D. 'Ryecroft Marge'
Group 3: Collerette dahlias A single outer ring of generally flat ray florets, which may overlap, with a ring of small florets (the collar), the centre forming a disc. D. 'Don Hill'
Group 4: Waterlily dahlias Fully double blooms characterised by broad and generally sparse ray florets, which are straight or slightly involute along their length giving the flower a shallow appearance. The depth should be less than half the diameter of the bloom. D. 'Charlie Dimmock'
Group 5: Decorative dahlias Fully double blooms showing no disc. The ray florets are generally broad and flat, or slightly twisted and usually bluntly pointed, and may be involute for no more than 75% of their length. D. 'Dikara Midnight'
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Group 6: Ball dahlias Fully double blooms, ball shaped or slightly flattened. The ray florets are blunt or rounded at the tips, spirally arranged, with margins involute for at least 75% of the length of the florets. D. 'Blyton Softer Gleam'
Group 7: Pompon dahlias Fully double, spherical blooms of miniature size, not exceeding 50mm in diameter, with florets involute for the whole of their length. D. 'Will's Ringwood Rosie'
Group 8: Cactus dahlias Fully double blooms, the ray florets are usually pointed, the majority narrow and revolute for 50% or more of their length and either straight or incurving. D. 'Lakeland Sunset'
Group 9: Semi-Cactus dahlias Fully double blooms, the ray florets are usually pointed, and revolute for more than 25% of their length and less than 50% of their length (longitudinal axis), broad at base and either straight or incurving. D. 'Julie's Delight'
Group 10: Miscellaneous dahlias Any dahlias which do not fall into one of the listed groups e.g. Peony-flowered dahlias. D. 'Bishop of Llandaff'
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Group 11: Fimbriated dahlias Ray florets should be evenly split or notched into two or more divisions, uniformly throughout the bloom creating a fringed effect. The petals may be flat, involute, revolute, straight, incurving or twisted. D. 'Anna Cozens'
Group 12: Single-Orchid dahlias Single outer ring of florets surrounding the disc. Ray florets are uniformly either involute or revolute. D. 'Juul's Allstar'
Group 13: Double-Orchid dahlias Fully double blooms, showing no disc. Ray florets are narrowly lanceolate and either involute or revolute. D. 'Mayan Pearl' Lilliput dahlias A low-growing type of dahlia usually no more than 30cm in height having single, semidouble or double florets attaining 2.6cm or so in diameter. Especially suitable for borders or display in containers on patios. Dwarf bedding dahlias The use of “Dw.B” after the classification of a cultivar indicates that these are dwarf bedding dahlias, not usually exceeding 60cm in height.
Further information on this trial is available from: Trials Office, The Royal Horticultural Society, Wisley, Woking, Surrey GU23 6QB Tel: 01483 224234 & Email:
[email protected] More information about RHS Trials and other illustrated final reports can be found on the RHS Website at www.rhs.org.uk/trials
Final Report for Trial No. 1889 – Dahlias 2010
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