A due amount of moisture may be kept up by the use of evaporating troughs and by syringing the walls and pathways two or three times a day, but the leaves should not be syringed.
Slug-worms or saw-fly larvae require treatment by washing with soapsuds, tobacco and lime-water or hellebore solution, and Aphides by syringing from below and removing all surplus young twigs.
Destroy aphides and other insects by syringing with tobacco water, or by fumigating, or by dusting with tobacco powder.
When the, fruit begins to ripen, syringing must be discontinued till the crop is gathered, after which the syringe must be again occasionally used.
The closing of ventilators (accompanied by syringing and damping of surfaces to produce a humid atmosphere) has for its object the conservation of as much solar heat as practicable.
During the growing period the atmosphere must be kept moist by damping the walls and pathways, and by syringing the plants according to their needs; when growth is completed less moisture will be necessary.
Watering, which, except during the resting period, should generally be copious, is best done in the forenoon; while syringing should be done early in the morning before the sun becomes too powerful, and late in the afternoon to admit of the foliage drying moderately before night.