You can also spray a fine mist on the foliage, although this is of doubtful effectiveness for total humidity modification. Do this early in the day so that the plants will be dry by night. This lessens the chance of disease, since cool dampness at night provides an ideal environment for disease infection. Ventilation Indoor plants, especially flowering varieties, are very sensitive to drafts or heat from registers. Forced air dries the plants rapidly, overtaxes their limited root systems, and may cause damage or plant loss.
Plants are sensitive to natural or blended gas.
Some plants refuse to flower, while others drop flower buds and foliage when exposed to gases. Blended gases are more toxic to plants than natural gases. Tomato plants are extremely sensitive to gas. They are available in many different combinations and under a multitude of brand names. Each brand should be analyzed on the label, indicating specifically how much water- soluble elemental nitrogen, phosphate, or potash is available in every pound of the product.