40 ROSKS OF SPECIES. 



proportionate -sized pots, as required, always using the materials of 

 compost in a chopped or rough state. Plants that are arrived at a 

 moderate size, of the large-leaved kinds, require more water than the 

 others, and to them I give occasionally manure water. I never expose 

 the plants to the open air, as is done to greenhouse stock in general, 

 but retain them in the house uniformly, also shading them from the 

 sun, which, when powerful upon them, is very injurious. At the ap- 

 proach of autumn less water is supplied, as it is an essential to success. 

 It is an essential to success, as the autumn approaches, gradually to 

 give less water, for if an abundance were continued when the general 

 growth had ceased, it would tend to destroy the delicate fibrous roots, 

 and speedily, often suddenly, the entire plant. Especial attention to 

 this matter in their management should be given. Tliose kinds which 

 grow thin of shoots and erect habit, and somewhat liable to become 

 naked, may readily be kept bushy by pinching off the ends of the 

 shoots which induces the production of laterals. By the above 

 management, vigorous, never-failing, healthy plants are maintained. 



ROSES OF SPECIES: 



REQUIUED VARIATIONS IN THEIR CULTURE. 

 BY ROSA. 



In the many excellent observations on the cultivation of the rose, whicli 

 have appeared in the Cabinet and other works on iiorticulture, I have 

 frequently observed that the rules, ^though most excellent in them- 

 selves, as applied to many species of roses, liave usually been too 

 general, and have proceeded on the principle of considering most 

 species as requiring the same modes of treatment, while tlie great 

 difference in the habits, nature, places, and manner of growth seem 

 to me to point out important variations in the soil, situation, and mode 

 of cultivation required by many of the diflferent species. I therefore 

 would state some of the differences and places of growtli, in a wild 

 state, of some of the species, and the variations that they seem to 

 suggest in the culture. Though plants are greatly altered by culture, 

 yet they generally retain a considerable bias to the soil and situation 

 for which, by nature, they are formed : and it is usually within a 

 certain range only, of what I would call their natural habits, that they 

 are capable of improvement by cultivation. 



In taking a cursory view of the difference which there appears to 

 me to be among some of the species of roses, I shall, to make myself 

 better understood, separate the genus into five divisions. 



In the first division, place Rosa spmosissima and its varieties ; the 

 JR. lutea, sulphurea and cinnamonea, which, from their slender shoots, 

 small and numerous thorns, and fibrous roots growing very near the 

 surface of the ground, are all, I believe, plants in their wild state 

 growing on heaths and places where there is but little depth of soil, 

 and are surrounded only by plants of a low stature ; they would seem, 

 therefore, to require to be planted in an airy situation, and not to need 

 much depth or strength of soil ; as in their natural places of growth, 



