In our house, and in countless others, it is not possible to make growing conditions as perfect as a plant might wish; but we try to come as close as we can, and find most plants are willing and able to make concessions. One more thing we do. We learn all about each plant’s natural home—desert, steamy jungle, Mexican mountainside—so we’ll know what combination of conditions it likes best.
CARE OF HOUSE AND GREENHOUSE PLANTS
Light and Sunlight
Plants need daylight to make energy; they can’t grow without it, or its equivalent in artificial light. They need some sunlight to set buds, and can’t flower without it or a substitute. Intensity and duration of light should vary according to each plant’s preferences.
No plant of ours is left to waste its life away on the fireplace mantel, where the light is too dim to read the printing on a book of matches. Granted, we might set it there for a day or so as a decoration, but we would return it to its bright window sill before it began to stretch out weakly in search of light. These are the signs of insufficient light—weak, lopsided growth; leaves that feel limp and look pale; new leaves, if any, growing progressively smaller and smaller; long leaf stems and long internodes.
Our window greenhouse, which faces south, is reserved for flowering plants that need all the light and sun we can give them, particularly in winter. This is Connecticut, remember; the winter sun seldom gets very hot or stays bright very long. And there are days on end when the sun simply does not show its face. California’s “shade plants”—begonias and fuchsias, for example—require full sun during a Northern winter.
For plants that are not quite so greedy for sunshine, we have the east-facing playroom picture window, which is lightly shaded by a high-branched deciduous tree in summer. For foliage plants, and a few others that will thrive on little or no sun, there are several other windows around the house where there is plentiful daylight, but the sun is seldom seen.
Your situation may be entirely different—perhaps a glassed-in porch that’s brighter than our window sills ever will be; or a contemporary-style glassed-in entry that lets sun stream in all winter long. Keep in mind that various plants have varying needs for light and sunlight; and the only sun that benefits a plant is that which falls directly on it. A south window may actually be shady in summer, and this is truer the farther south you go.
Temperature
Some plants grow their healthiest when the thermometer reads 50 to 55 degrees at night and 5 to 10 degrees higher during the day; some tender tropical émigrés suffer a chill when the mercury dips under 60 degrees at night. But the greatest number will tolerate a fairly wide range, and are quite content with whatever the house has to offer. This again assumes that other conditions, such as humidity, are kept up to the plants’ requirements.