398 THE PRINCIPLES OF FLORICULTURE 



3. Some varieties, not easily forced otherwise, do very 

 well after etherization. 



4. Lilacs, not prepared for forcing, after being etherized, 

 bloom freely. 



5. There is less expense connected with forcing plants 

 by using ether, as the plants occupy the houses a shorter 

 time, and force at a lower temperature. They also bring 

 higher prices because of an early market and better 

 quality of bloom. 



FORCING HERBACEOUS BIENNIALS AND PERENNIALS 



Herbaceous biennals and perennials adapt themselves 

 for forcing even better than do shrubs (Fig 47) . 



650. List of herbaceous plants which adapt themselves 

 for forcing : - 



Achillea Ptarmica var. The Pearl . . Double White Yarrow 

 Agapanthus umbellatus . . . . . . * . . African Lily 



Astilbe japonica * : " . . . . Spirea 



Convallaria majalis ........ Lily-of-the- valley 



Cypripedium spectabile Showy Lady's Slipper 



Delphinium formosum Larkspur 



Dicentra spectabilis Bleeding Heart 



Digitalis purpurea Foxglove 



Filipendula (Ulmaria) palmata . . . Meadow Queen Spirea 



Gaillardia aristata . Blanket Flower 



Gypsophila paniculata . Baby's Breath 



Hesperis matronalis Sweet Rocket 



Kniphofla Uvaria Tritoma or Poker Plant 



Lilium elegans ; . . Thunbergian Lily 



Lilium candidum Madonna Lily 



Lilium speciosum var. rubrum . . . . . . Spotted Lily 



Lythrum Salicaria Purple Loose-Strife 



Myosotis palustris Forget-me-not 



Pentstemon grandiflorus . . . Orchid-flowered Pentstemon 



Platycodon grandiflorum Balloon Flower 



Primula kewensis English primrose 



Primula Polyantha Polyanthus Primrose 



Viola cornuta Horned Violet 



Most bulbs. 



