Outdoor Temperature And Protecting Plants
We are now approaching the time when it will be much easier, as well as less expensive to run the greenhouse. Cold winds will be less in evidence and surely, very low outdoor temperatures will be a thing of the past until another fall.
However, the very best results will not usually be obtained by those who throw the ventilators wide open in the early morning and leave all to fate until nightfall. Such procedure would probably be in order in a greenhouse which has been in use only for wintering interesting but rather tender plants from countries such as Chili, South Africa and Australasia.
Tender young seedlings, newly inserted cuttings and tropical plants generally must not be exposed to drafts nor even to a very airy atmosphere. Where such exists, it would be evident that the surface soil, where the seedlings are growing, would dry up quickly and seedlings can only be expected to possess little more than surface roots.
Cuttings that have yet no roots at all would soon lose all the sap in their leaves were they subjected to a dry and airy environment. Then, most tropical plants are happiest in dank and humid surroundings and wide open ventilators would not be conducive to these conditions.
It is not difficult to appreciate how best to take care of the ventilation, provided someone is around to increase or reduce it as the demand arises. But for some, it will require not only an understanding of the plants’ needs, but an ability to foresee and provide for their requirements in the course of a day’s absence. That may best be done by copious water supplies in the morning, shading of the glass and in the case of cuttings and tender seedlings, a screen of paper or cheesecloth on likely bright days. This may be most useful in maintaining what could be described as “a dead air” or a calm, around the cuttings, thus slowing down evaporation.
On top of all this, it would be a valuable asset to be a good weather prophet, though this is rare, even when one is provided with some such device as a good barometer! Thus, the ventilation, under such circumstances must always be of a moderate nature.
It is obvious that such methods could only be of the hit or miss typo and where such a state must be. it can best be overcome by a wise selection of plants - plants that are not particularly miffy or very sensitive to fluctuations of temperature. A house that can be maintained at 50-55 degrees at night will be the most suitable when a wide range of the easier species is attempted.
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