rumpet/red daffodils (1Y-O/R The large -cupped yellowand range/red daffodils (-YYOR) 36 CHAPTER 17 THE POETICUS CULTIVARS 273 Some Other Early Poeticus Hybrids ticus Hvbrids Poeticus Cultivars 1980-2010.. .274 CHAPTER 18 SOME OTHER HYBRIDS OF GARDEN ORIGIN.76 Division 5-The Triandrus Hybrids. 219 Dvhetrian uscultivars affodils of Garden Origin yclamineus ot G CHAPTER 19 DIVISIONS 10(BULBOCOD/UM CVS)AND 12(MISCELLANEOUS DAFFODILS). .296 CHAPTER 20 DIVISION 11-SPLIT CORONA DAFFODILS .300 CHAPTER 21 HYBRIDISATION. 305 A Brief ntroduction to the History of Plant Bree ding 305 y to Hybridise Aid to Hybr election c seedlings of success? Loo 31 CHAPTER 22 PROPAGATION .325 ReasUeetgeieproacton Cross-cutting and scooping. Colchicine and the Inducement of Polyploid Forms ACautionary Note on the Use of Chemicals .332 CHAPTER 23 GROWING DAFFODILS .336 Naturalised Daffodils 3 Daffodils in Borders and Rock Gardens conse dthe Historic Colections Field Produc of Cut Flowers rage of bulbs 34 lower Bu Retardati Shift8 The trumpet yellow and orange/red daffodils (1Y-O/R)..........................................................................................................266 The large-cupped yellow and orange/red daffodils (2Y-O/R)..................................................................................................267 The large-cupped yellow and orange/red daffodils (2Y-YYO/R) ..............................................................................................267 The small-cupped yellow and orange/red daffodils (3Y-O/R)..................................................................................................267 The small-cupped yellow and orange/red daffodils (3Y-YYO/R)..............................................................................................267 CHAPTER 17 THE POETICUS CULTIVARS ...........................................................................................................................272 The Early Cultivars of Engleheart ..................................................................................................................................................273 Some Other Early Poeticus Hybrids...............................................................................................................................................273 ‘Cantabile’ .....................................................................................................................................................................................274 Modern Poeticus Hybrids..............................................................................................................................................................274 Poeticus Cultivars 1980-2010........................................................................................................................................................274 CHAPTER 18 SOME OTHER HYBRIDS OF GARDEN ORIGIN ................................................................................................276 Division 5 – The Triandrus Hybrids................................................................................................................................................276 The triandrus cultivars.............................................................................................................................................................277 Divison 6 – Cyclamineus Daffodils of Garden Origin .....................................................................................................................278 The cyclamineus cultivars........................................................................................................................................................278 Division 7 – Jonquil Daffodils of Garden Origin.............................................................................................................................280 Division 8 - Tazetta Daffodils of Garden Origin.............................................................................................................................282 CHAPTER 19 DIVISIONS 10 (BULBOCODIUM CVS) AND 12 (MISCELLANEOUS DAFFODILS)................................................296 CHAPTER 20 DIVISION 11 – SPLIT CORONA DAFFODILS....................................................................................................300 CHAPTER 21 HYBRIDISATION...........................................................................................................................................305 A Brief Introduction to the History of Plant Breeding ...................................................................................................................305 Chromosome Number and the Ability to Hybridise ......................................................................................................................305 Plant Manipulation as an Aid to Hybridisation..............................................................................................................................310 Mutations......................................................................................................................................................................................310 Induced mutations...................................................................................................................................................................311 Practical Aspects of Hybridisation.................................................................................................................................................312 Selection of seedlings ..............................................................................................................................................................313 What are the chances of success? ...........................................................................................................................................314 Looking into the Future.................................................................................................................................................................314 Hybridisation Records...................................................................................................................................................................318 Recording Cultivars.......................................................................................................................................................................319 CHAPTER 22 PROPAGATION ............................................................................................................................................325 Propagation by Seed .....................................................................................................................................................................325 Natural Vegetative Reproduction .................................................................................................................................................326 Cross-cutting and Scooping...........................................................................................................................................................326 Twin-scaling ..................................................................................................................................................................................327 Colchicine and the Inducement of Polyploid Forms......................................................................................................................329 Chipping ........................................................................................................................................................................................329 Micro-propagation........................................................................................................................................................................331 A Cautionary Note on the Use of Chemicals.................................................................................................................................332 CHAPTER 23 GROWING DAFFODILS .................................................................................................................................336 Naturalised Daffodils.....................................................................................................................................................................336 Daffodils in Borders and Rock Gardens.........................................................................................................................................338 Bulbs in Pots..................................................................................................................................................................................338 Conservation and the Historic Collections....................................................................................................................................339 Field Production of Cut Flowers....................................................................................................................................................340 Harvesting the Flowers .................................................................................................................................................................342 Lifting and Storage of Bulbs ..........................................................................................................................................................342 Flower Forcing...............................................................................................................................................................................343 Daffodil Bulb Production...............................................................................................................................................................346 Bulb Retardation ...........................................................................................................................................................................350 The Influence of Hemisphere Shift on Flowering ..........................................................................................................................350