WINTER-FLOWERING PLANTS. 99 



in the greenhouse for winter flowering are hardy enough 

 to stand our winters in the Northern States, though 

 most of them prove hardy south of Richmond. 



The Hybrid Perpetual class of Eoses are less grown by 

 amateurs than the Teas, and if wanted in midwinter require 

 special treatment, which our space here will not admit 

 being given, but which is contained at length in "Practical 

 Floriculture." The varieties of Hybrid Perpetuals best 

 adapted for early forcing are : Anne de Diesbach (rich 

 pink), Countess of Oxford (very large, soft, rosy carmine), 

 Magna Charta (splendid bright pink), Mad. Gabriel 

 Luizet (light pink, splendid), Paul Neyron (immense 

 size, dark pink), Baroness Rothschild (rich shade of rose), 

 Rosy Morn (cherry rose, large and full), Merveille de 

 Lyon (pure white, other characteristics same as Bar- 

 oness Rothschild), Anne Alexis (dark pink), General 

 Jacqueminot (crimson), Princess C. de Rohan (crimson, 

 almost black), Dinsmore (crimson scarlet), Marquis de 

 Castellaine (brilliant pinkish carmine), Pride of Wal- 

 tham (peach color), Mrs. Laing (light shade of rose color). 



MILDEW. 



Roses, when grown under glass, with proper attention 

 to temperature and moisture, are not usually attacked by 

 Mildew ; but, as a preventive, it is well to paint the hot- 

 water pipes once every two or three weeks with a mixture 

 of sulphur and lime or sulphur and guano, made of the 

 consistence of whitewash (the guano or lime is simply to 

 make the sulphur stick better to the pipes). We also 

 use this mixture of sulphur on our steam pipes, but only 

 on about one-sixth of the surface. If the whole pipe 

 were covered, as in the hot-water pipe, the fumes would 

 be strong enough to hurt the plants. The fumes of 

 sulphur, as diffused by the heated pipes, is a never- 

 failing means of destroying the germs of Mildew or 



