December- In the Flower Garden
Plant-Houses.
Orchid Houses The dull and foggy weather prevalent at this season of the year is very troublesome to the cultivator of Orchids, particularly in low-lying districts where fogs are the usual cpndition. In such places very little damping down of the houses must be practised unless a considerable amount of fire-heat is used to keep up the desired temperature. In the latter case, instead of damping the paths and stages, moisten well the surface round the hot-water pipes two or three times daily, according to the state of the external atmosphere.
Most of the Cattleyas and Laelias will now be dormant, and a damping down of the houses in which they are situated three or four times a week will be sufficient. In the intermediate section many plants will require moisture to keep them in a healthy flourishing condition. Here the cultivator must again be guided by external influences. In some localities, especially on elevated ground in exposed situations, where the soil is naturally dry, there is far less humidity in the atmosphere. Where such is the case it is almost impossible to avoid aridity, especially if the surface within the houses is non-porous. For Odontoglossums we advocate the use of tanks running underneath the stages the whole length of the structures, and if the hot-water pipes are placed side by side over these there is no surface to dry. It is far better to reduce the temperature of the houses two or three degrees than to have a parching heat. If canvas were fixed on rollers so that it could be let down in severe weather the difference to the inside temperature would be very great. With an equal amount of artificial heating the house would be at least ten degrees warmer. The great drawback to such coverings, however, is that they often get frozen to the rafters and cannot be rolled up till it has thawed.
Hothouse.-Where much indoor decoration has to be done a batch of Caladiums should be grown on for the purpose, as no better decorative plants can be found than some of the dwarf varieties.
Continue to propagate Coleus, Acalyphas, and other plants of that class which are easy to cultivate to supply plants for decorating. December is not a month when we may expect to see many hothouse plants in flower; still, there should be a quantity of the winter-flowering section of Begonias in bloom. These, together with such things as Euphorbia jacquiniceflora, Epiphyllums, Rondeletias, Scutellaria, Thyrsacanthus rutilans, Sericographis, &c, will make a brilliant show, intermixed with other fine-foliaged plants. Most of the plants in this department will now be at rest, therefore the temperature of the houses should be kept as low as is safe, so that the plants may not be unduly excited too early. Potting material of all kinds should be brought under cover, and, if possible, put into a temperature quite as high as that in which the plants are growing, in order that it may be ready for use when required.
Greenhouse and Conservatory One of the greatest obstacles with which a gardener has to contend in the case of Conservatories adjoining a dwelling-house is the frequent opening and shutting of doors at this period of the year, where there is a passage through from one to the other. Too much care cannot be exercised in this case when the air externally is a number of degrees below that of the house. Plants suffer more from a sudden draught and cutting winds than from a persistent low temperature. It is far preferable to have a porch and double doors to such places in order that the outer doors may be closed before the inner are opened. These structures should also have sufficient hot-water pipes to keep them at the requisite temperature without the necessity of heating them to such an extent as to cause a drying atmosphere. Nothing is more unpleasant than the smell of over-heated pipes. They have also a very injurious effect on the plants. Ventilate cautiously when frosty winds are prevalent, and see that the plants are not subjected to cold draughts.
Forcing House. - Continue to introduce plants into heat as may be necessary to keep up a succession of bloom. It is not advisable, however, to take them from a cold frame or pit and to place them in a strong heat all at once, as this process has often a tendency to cause the buds to fall. Such plants are best brought on steadily, and for this reason require a moderate heat to commence with. Hyacinths, Tulips, and Narcissus started now will bloom far better than those introduced into heat last month. Great care must be used in hardening all such plants before they are taken to the Conservatory or Greenhouse.
Pits And Frames.
Violets will now require particular attention. If the weather be severe enough to prevent the removal of the lights for any length of time, take advantage of the first favourable opportunity to give air, or the buds will damp off. No good is obtained by uncovering frames when the temperature in the open is several degrees below freezing-point, as that inside these structures will also be abnormally low. Therefore unless some of the plants are showing flower, no harm will be done to them if they are not uncovered for a month, or so long as the frost lasts. As soon, however, as a thaw occurs, the covering should be removed and air gradually admitted till the plants are inured to the outside temperature. Be careful in watering any inmates of pits and frames, giving sufficient only to prevent flagging. Some of the more hardy occupants, such as border Carnations, Brompton and other Stocks. Hollyhocks, Violas, &c, will take no harm if exposed to one or two degrees of frost. Better to be so exposed than to be coddled.
Flower-Garden And Pleasure Ground.
Whenever the weather remains open push on with the planting of all kinds of deciduous trees and shrubs, as the sooner they are planted the better. Look over flower-beds that were planted last month, and pick up leaves and other litter that may have got lodged there by the wind. Rake out leaves from amongst shrubs and dig over the borders, so that they may present a tidy and well-kept appearance. Should the weather be frosty, wheel on manure and turn over any refuse heaps, in order that the contents may be thoroughly decomposed before wheeling it on to the ground. Examine drains and see that no gravel has been washed into them by heavy rain. Clean out cesspools and water tanks that have become stagnant, so that the latter may get filled again before spring. Re-gravel walks where necessary, and turn others that have become green or mossy. Any alterations needed in the way of relaying turf should be proceeded with during mild weather, so that the ground may be settled down by spring. Prune and train creepers to walls and fences. Protect half-hardy plants from frost, and in bad weather make a sufficient quantity of labels to name plants as they are planted out.
