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ON SEPARATE STRUCTURES FOR DIFFERENT PLANTS. 
One of the best pleas for separating dissimilar plants during growth is found 
in the application of water. Plants nearly of an equal ratio of growth, possessing 
roots equivalent in strength and foliage, of a similar size and texture, will require 
much about the same amount of fluid, both at the roots and overhead. Hence, 
when set together, there will be little trouble in watering, and small risk of giving 
to any, either too little or too much. 
Soft- wooded plants, like the Pelargonium, with strong roots, and large broad 
foliage that transpires freely, require considerably more water at the root, than the 
hard-wooded Heath, with its delicate fibrils and narrow leaves. The former, 
moreover, through the medium of its leaves, imbibes a larger proportion of its 
nourishment from the atmosphere, than can be absorbed by the small foliage of the 
Heath ; hence, greater benefit will be received by the first from frequent 
syringings. 
It will require some experience to arrive at a suitable classification even of 
greenhouse plants. Evergreens, with smooth coriaceous leaves, seldom need so 
much water as plants with rough coarse ones. There is often, moreover, consider- 
able disparity in the amount of water required by different members of the same 
genus — Heaths, for instance ; the strongest species, therefore, or those which 
require most watering, should be brought together, proceeding gradually to the 
weakest, or those which demand least. 
Besides this, to keep up a constant succession of flowers, it is necessary to 
have plants in different stages of growth — to push some early into bloom, and 
to hold others back. Some species, again, will thrive best under a good circula- 
tion of air : and various degrees of light and shade, and of heat and moisture, must 
be produced to suit others. 
It is, therefore, in multiplying the number of pits and frames, that the repeal 
of the glass duties will be of the most signal service in floriculture. Large houses 
will no doubt become more frequent, but they must still be confined to the few : 
whilst these structures will facilitate the operations of the many, and are, in fact, 
the best calculated to realise perfection in the cultivation of most shrubs and other 
plants of low growth. But we must give large houses their due ; and may 
remark in passing, that they will afford scope to the culture of Banksias, and 
other Proteaceous shrubs and trees, which have hitherto been so much more 
neglected in England than on the Continent. The noble forms of the Palm-tribe 
will also, we trust, be more commonly met with. 
But to return : economy may also be studied in the formation of pits. For 
stove-plants, a brick pit will doubtless prove best, on account of the necessity of 
fitting up with a heating apparatus ; but most greenhouse plants will be warm 
enough within walls of turf, with a wooden framework for the lights to run in, on 
the top. To preserve the wood from decay, it will be well to place a slate slab 
between it and the turf, cementing them together, and securing the whole in a 
steady position. Or a frame might be made with a few upright posts, and rough, 
