THE GREEX-HOUSE. 
HO 
just moistened, so as to give off some portion 
of vapour, which will rise about the plants 
under the influence of the heat of the sun. 
Temperature, Sfc. — More heat, moisture,_ 
and air, will be required by the plants gene- 
rally as the season advances : a temperature 
of 50 degrees may be taken as a mean, above 
which, from 10 to 15 degrees may be allowed 
by sun-heat; on no account maintain a high 
night temperature. Evaporation will be more 
brisk, therefore more moisture will be required, 
both at the roots, and in the atmosphere about 
the leaves and stems. As to ventilation, keep- 
ing in mind what has been stated above, a 
somewhat freer circulation of air may be 
allowed than was the case last month ; indeed, 
as one great use, if not the only use of ven- 
tilating, is to regulate the temperature, it 
will be pretty evident, that with the increase 
of heat by the sun, increased ventilation will 
be necessary to avoid its being felt in excess. 
Shading. — This is not to be recommended 
in general. Plants that are quite as they 
should be at the root, do not suffer from the 
sun's rays ; but as the interior of a glass struc- 
ture will be apt to become too much heated 
when these rays are very powerful, it may be 
allowed to prevent this inconvenience. Plants 
in flower, too, require some degree of shade, 
both to keep their colours from fading, and 
also to prevent the blooms themselves from 
falling. Plants in pots generally suffer more 
when the rays of the sun are permitted to 
strike the sides of the pots, and thus act on 
the delicate and tender spongioles of the roots : 
if the roots are protected, the tops — of grow- 
ing plants at least — will not be injuriously 
affected by sun. Sometimes shading is neces- 
sary from other causes, such as bad glass hav- 
ing been used — glass full of lenses, which 
collects the sun's rays into foci, and thus the 
leaves of the plant are liable to get scorched. 
Inserts. — An unceasing warfare should be 
maintained against all sorts of insects to which 
plants are liable, especially on the permanent 
plant, and climbers ; for the latter grow so 
fast, that if not cleared earl)' in the season, it 
is almost impossible to do so afterwards ; and 
the latter, (rem their size, and being perma- 
nently fixed, are not so easily subjected to 
other corrective treatment. Red spider and 
thrip must be kept down by syringing with 
clear soot water; green-fty, or aphis, by fumi- 
gation with tobacco ; and the scale insects by 
a thorough routing and cleanliness. 
Climbers. — Unremitting attention is re- 
quired by them as they progress, for they 
mostly grow rapidly, and soon become con- 
fused, unless very well looked after. Regard 
must be -paid to the natural habits of each 
kind as to flowering, and the present manage- 
ment must be moulded accordingly : those 
that bloom on the long shoots of the present 
year's growth must have them encouraged, 
and the weaker ones removed ; whilst those 
that bloom on laterals must be managed with 
a view to the production and encouragement 
of laterals. For climbing plants in pots, 
cylindrical-shaped, or pillar trellises, are pre- 
ferable. A few later flowers may be produced 
from some of the free-flowering creepers, by 
pruning the plants severely now. 
Shifting. — The large plants, which are 
kept in large pots, or in boxes or, tubs, should 
be looked to at this time of the year, and 
placed in larger ones, if necessary. Usually, 
however, it is sufficient, and preferable, to 
remove carefully some of the old soil from the 
roots, and replace them probably in the same 
pots or boxes, filling up with fresh and con- 
genial soil : the state of the roots must in 
great measure decide this question : if they 
are numerous and healthy, and the plant is 
required to increase in size, a larger pot may 
be given it ; but if they are few, and do not 
appear vigorous, by no means give them more 
room at the root, but rather restrict them. 
Put in plenty of drainage, and use the soil in 
a very rough state, with a few pieces or lumps 
of charcoal thrown in as the shifting proceeds. 
Flowers. — Most of the gay and charming 
shrubs of New Holland will now be blooming, 
and will be required to deck this structure ; 
besides which, every other house should be 
taxed to supply its quota, so as to render this 
house the "gayest of the gay." Sweet- 
scented plants should especially be provided 
in considerable numbers, for there is a charm 
in their odour fully equal to that of their 
beauty. 
THE GREEN-HOUSE. 
The re-potting and shifting of the plants, 
as they require it, must be well followed up ; 
(see the directions given at p. 51.) The pro- 
pagation of plants by the many arts practised, 
on the principle of extension, should be pro- 
secuted ; this includes such as by cuttings, by 
layers, grafting, inarching, budding, division 
of the root, and so on. Cuttings, wdien thev 
can be got in a fit state, root better now than 
in the heat of summer, and are better able to 
get well established before winter than those 
rooted in the autumn. 
House for Miscellaneous Px.a\t,*. — A 
succession of bloom, which is one ef the main 
objects of furnishing green-houses at all, will 
be aided by keeping a f«iw plants in various 
stages of forwardness as regards pruning and 
stopping back the young shoots. The same 
may be said of polling, for it is very impolitic, 
for more reasons than one, to shift, the whole 
of a collection of plants, or all the plants of 
one particular kind, at one time. 
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