The American Flower Garden Directory. Robert Buist

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Hot-House.

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JANUARY.

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      At all times be very careful of the temperature of this department, and more especially at this season of the year, as a few minutes' neglect might materially injure many of the delicate plants. The thermometer ought to range between 58° and 65°. In fine sunshine days, admit a little air by having some of the top sashes let down, one, two, or three inches, according to the weather, and let it always be done from eleven to one o'clock; but by no means in such a manner as to cause a draught in the interior of the house, which would be very prejudicial. Therefore be always cautious during cold weather, in administering that necessary element to vegetation, which is so conducive to health.

      OF FIRING AND FUEL.

      The Hot-house ought never to be left entirely to inexperienced persons, because they are not aware of what might be the result of inattention even for an hour. Attention to the following observations will obviate every difficulty. About this season of the year, frost generally sets in very severe in the middle states. Suppose the day may have all the clemency of spring, the night may be directly the reverse. Every precaution is necessary to guard against extremes. According to what was said last month, it is understood that the shutters are put on every night at sundown, and in severe weather, they must be put on as soon as the sun goes off the glass. If the shutters are omitted till late in severe frost, it will so reduce the heat of the house, that you cannot overcome it by fire until near midnight; and when done, the fire or fires have been made more powerful than they ought to be, proving uncongenial to the plants that are near the flues. The air, as above directed, having been taken off the house at one o'clock, as soon as the mercury begins to fall in the thermometer, kindle the fire, and supposing it is anthracite coal, in twenty minutes, with a good drawing furnace, the heat will operate in the house. If a coal fire, kindled about four o'clock, it will require an addition about six, and then may be made up again about nine or ten, which will suffice until morning. The quantity must be regulated by the weather. If the fuel is wood, it must be attended to three or four times during the evening; and when the mornings are intensely cold, one fire in the morning is requisite. When there are bad drawing furnaces the fires must be made much earlier, perhaps by two or three o'clock, which will be easily observed by the time the fire takes effect upon the air of the house. The temperature ought never to be under 55° of Fahrenheit.

      OF WATERING THE PLANTS.

      To do this judiciously, is so necessary to vegetation, and so requisite to understand, and yet the knowledge so difficult to convey to others (being entirely acquired by practice,) that if the power was in man to impart it to his fellow-men, he would possess the power of perfecting a gardener by diction. However, the hints on this important point of floraculture, will be as clear and expressive as can at present be elicited. All plants in this work that are aquatic, shall be specified as such; and those that are arid shall be duly mentioned. All others will come in the medium.

      All the plants must be looked over every day, and those watered that appear to be getting dry on the top. It must be strictly observed not to give water to any but such as are becoming dry, and let it be given moderately at this season. Two or three days may perhaps elapse before it need be repeated. There is not so much liability to err at present in giving too little, as in administering too much. Vegetation amongst the stove or Hot-house plants will soon begin to show, and the soil will prove uncongenial if it is impregnated with stagnant moisture. Small plants should always be watered with a pot, having what is termed a rose upon it. The surface of the rose, that is, where it is perforated with small apertures, ought to be level, or a little concave, which would convey the water more to a centre, and make neater work, by preventing any water from being unnecessarily spilt in the house. The size of the pot will be regulated by the person to suit the conveniences of the place. Water, when applied either to the roots or foliage of the plants, should be about the medium temperature of the house. The cistern, built on the plan herein recommended, will always give this, and sometimes more, which can easily be reduced by adding cold water. Where there are no cisterns, a tank or barrel might be in the house, in which the water could stand for one night or more, as is most suitable. When water is given without being thus aired, it chills the roots, prevents a luxuriant growth, injures the fresh and healthful appearance of the foliage, and too frequently gives to all the plants a sickly hue.

      OF INSECTS, THEIR DESTRUCTION, &c.

      In this department, insects begin to increase by hundreds, and too frequently their ravages are very obvious before their progress is arrested. We will treat of those which are most common, under their respective heads, with their nature and cure, as far as has come under our observation.

      Aphis rosæ, of the natural order of Hemiptera, or what is commonly known by Green Fly, Green Lice, &c. infect plants in general, and are particularly destructive in the Hot-house to Hibíscus ròsa-sinénsis, Asclèpias, Crássula coccínea, Alstrœmèria, and many other plants of a free growing nature. They attack the young and tender shoots at the point, leaving a dark filthy appearance on the foliage. Many remedies for their destruction have been offered to the public by various writers, each equally secure in his own opinion. Extensive practice alone can show the most easy and effectual cure. Fumigating with tobacco is decidedly the most efficacious, and in the power of any to perform. Take a small circular furnace, made of sheet iron, diameter at top twelve inches, and at bottom eight; depth one foot, having a grating in it to reach within three inches of the bottom, which will leave space for the air to pass, and where the ashes will fall and be kept in safety, having a handle like a pail to carry it with. This, or any thing similar, being ready, put in it a few embers of ignited charcoal; take it into the centre of the house, and put on the coals a quantity of moist tobacco stems. If they attempt to blaze or flame, sprinkle a little water over them; and as they consume, continue to add tobacco until the house is entirely full of smoke, observing always to do it in still, cloudy weather, or in the evening. If it is windy, the smoke is carried off without having half the effect, and requires more tobacco. The house must be closely shut up. There are several plants whose foliage is of a soft downy nature, such as Helitròpiums, Callacárpas, Sálvias, and many of the Lantànas, Víncas, with several others, that cannot stand, without danger, strong fumigation. These should be put low down in the house, or under the stage. These fumigations will have to be repeated frequently, the time for which will easily be perceived; and, when required, ought not to be delayed. Several species and varieties of the same genus, Aphis, can be destroyed in the like manner.

      Acaris tellurius, or red spider, is caused by a dry atmosphere, and its havoc generally is obvious before it is arrested. With its proboscis, it wounds the fine capillary vessels; and if the leaves are fine, they will appear as if probed with a needle, and yellowish around the wound. If they have farther progressed in their destructive work, the leaves will prematurely decay. On this appearance, turn up the leaf, and you will see them running about with incredible swiftness. Their body is of a blood colour, and their feet, eight in number, light red. When very numerous, they work thick webs on the under side of the leaf, and frequently all over it, forming a mass of half dead plants, decayed leaves, and thousands of spiders. The most effectual remedy is a thorough syringing with water, and profusely under the foliage. This being done every evening, will subdue and eventually banish them. Had the house been syringed two or three times per week, these intruders would not have appeared. It is said by some writers, that watering only reduces them to a temporary state of inaction, and will СКАЧАТЬ