THE COTTAGE GARDENER. 
179 
^ June 17. 
Passifloea ai.ata supeeba.— A great improvement 
even upon that fine species P. ulata; the form is better, 
and the colours more vivid, os. 
I P. amabilis.— Bright scarlet; very fine. os. 
P. Comte Kisseloff.— 5s. 
P. Comte Nessf.lbode. —These two are said to he 
exceedingly beautiful, but they have not flowered yet in 
Great Britain. 
P. eaoemosa elegans. —An improvement upon the 
1 species, with finer and more highly-coloured flowers. 
] 10s. Gd. 
Poetlandia pi.atantha. —This is a truly fine plant, 
| often sent out as P. grandifiora, but is much superior 
I to that fine plant, flowering more freely, and more dwarf 
in habit. 21s. T. Appi.kby. 
(To be continued.) 
CULTURE OF ROSES IN POTS FOR 
EXHIBITION. 
(Continuedfrom page 1G5-9 
Mildew. —In the various pursuits to which mankind 
devote their time and talents, there are none that re¬ 
quire such a large stock of patience, industry, and 
untiring perseverance as that of horticulture, in the 
varying climate of this country. More especially are 
the above qualities necessary to the cultivator of florists’ 
flowers. He may procure the best plants; he may put 
up the necessary erections to grow them in; he may pro¬ 
cure the proper soils without exercising much thought or 
attention ; his purse, if well filled, may do this, but the 
after attention and care will still be in daily requisition. 
The proper degree of temperature, of watering, giving 
air, and destroying insects, must be daily bestowed, or 
he will miserably fail. Even when all these points 
have been carefully attended to, disease may attack the 
objects of his labour of love, and put to flight all hopes 
of success, unless remedies are applied instantly the 
disease appears, and there is no disease so fearfully 
destructive as that plague, the mildew, and no plant 
that suffers more than the rose from its ravages. In 
the open air, it is very rarely observed until the decline 
of the year. Then, when cold, damp weather prevails, 
this parasite may be seen making daily progress, espe¬ 
cially in wet soils and low situations. Then, by its 
baneful influence, it destroys the energies and weakens 
the powers of the plants to perform the functions of life, 
prevents the late flowers expanding, and, what is of the 
greatest consequence, prevents the wood from attaining 
what is technically called ripeness, and so injures the 
plants for the following year. 
Roses in pots are subject to mildew from similar 
causes, namely, a low, close, damp atmosphere in the 
house or pit, and the remedy is obvious. In such struc¬ 
tures, where the atmosphere is in a great measure under 
the control of the manager, it is his own fault if the 
internal air is not rendered sweet and wholsome. When¬ 
ever the mildew appears, raise the heat of the house, 
give abundance of air on all favourable occasions, and 
be careful that there is no more water used than is abso¬ 
lutely necessary to keep the plants growing and healthy. 
The floor of the house should be kept dry and clean, 
and every decayed leaf removed. The soil on the sur¬ 
face in the pot should be frequently stirred, to prevent 
moss and lichens from growing, for these are not only 
unsightly, but positively injurious, by rctainiug moisture, 
and thus giving out a bad, unwholesome, and disagree¬ 
able air, or, more properly, miasma, which is offensive 
to the organ of smelling, and must be greatly injurious 
to the plants that are constantly exposed to its ill effects. 
If, notwithstanding all these remedial measures, the 
mildew still appears to spread, then procure some flower 
of sulphur, as it is called, and dust it over the leaves 
affected ; the parts that are mildewed will retain it, and 
its pungent qualities will destroy it; and as soon as 
that is effected, let it, some fine dry morning, be washed 
off with the syringe. 
Very lately we had occasion to visit an establishment 
not a hundred miles from London, and were shown a 
house full of forced l'oses upon which the mildew 
had made its appearance in great strength ; and no 
wonder! The roots were standing upon a bed of 
wet sand—the walks were wet and slippery with mud— 
the house had very little air—and the smell arising from 
the wet and mud was exceedingly strong and offensive. 
No wonder the mildew flourished under such circum¬ 
stances ! and we are fully persuaded that the cause why 
it has prevailed so extensively lately, in some places, on 
the vine, arises from the same circumstances in a great 
degree; and until such circumstances are remedied it 
will prevail still more extensively. 
Let the grower of roses in pots for exhibition, or for 
any other purposes, then, be careful to keep the air in 
his rose-honse sweet, dry, and wholesome, or, he may 
depend upon it, the mildew will quickly make its 
appearance, and render nugatory all the care, expense, 
and trouble he may have put himself to. 
There is another disease that sometimes makes its 
appearance upon the leaves of the rose, and very much 
injures and disfigures them. This disease, for want of 
a better name, we shall designate gangrene. A small 
spot appears somewhere near the centre of apparently a 
healthy leaf. It quickly spreads, becomes of a bright 
reddish yellow colour, and soon destroys the leaf. The 
cause of this is wrapped in mystery. No insect that we 
could ever discover is seen upon or within the leaf, 
neither was a drop of water near it. Whether any 
specks in the glass may cause it is also a matter of 
doubt, for we have observed it on leaves that the sun’s 
beams never could possibly reach. If any one of our 
readers have been fortunate enough to detect the cause, 
we should be greatly obliged by the information. The 
cause being unknown, it is difficult to say what remedy 
to apply; the only feasible one we can suggest is to cut 
off the leaves affected the moment they are observed ; 
for though we are confessedly ignorant whether it is 
infectious, and of a spreading character, yet we are 
sensible that by cutting off the affected leaves, and ex¬ 
pelling them from the premises, we are, as much as lies 
in our power, preventing the disease from spreading. 
T. Appleby. 
(To be continued.) 
KITCHEN-GARDEN WALKS. 
If we were asked, if any one thing more than another 
is necessary to give a garden, or grounds, the appear¬ 
ance of good keeping, we should reply—Yes, the quality 
of the “ walks,” and their adjuncts “ the edgings.” Even 
the kitchen-garden, where the multiplicity of operations 
are continually going on, is much enhanced in beauty 
by being intersected with good sound walks; we use the 
word sound, because it is more important here that those 
main thoroughfares, for wheeled carriages as well as 
pedestrians, should be firm and hard, rather than only 
ornamental, which is more especially the case where 
traffic is confined, in a great measure, to the latter class. 
Some months ago, Mr. Beaton detailed to us his mode 
of making walks for flower-garden or pleasure-ground 
purposes, which doubtless were good for such places, and 
still more so where a considerable declivity was to be 
ascended ; but unless the material he used differs much 
from the same kind in other parts, they appeared to us to 
contain too much of soft matter to endure the wear of 
barrow-wheels, when continued from day to day, as is 
often the case in this department of industry rather than 
of repose. We, therefore, advise those of our friends 
