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The air in our homes has a dramatic effect on plants, also. In their native tropics, plants thrive in warm, humid conditions. In our homes, the air is usually drier and temperatures can fluctuate widely. Grouping plants is one way to increase humidity. Placing plants on a tray filled with moist vermiculite or pebbles is another.
Most plants will grow in a temperature range of 65 to 75 degrees F. A few degrees above or below this is usually fine; however, some tropical plants ' suffer below 60 degrees. In the winter, a cold window can damage even the hardiest plants. Drafts of hot or cold air can also damage plants.
Improper watering kills more houseplants than all other causes combined. Don’t simply water on a schedule. Group plants by their light requirements as well as by their water needs. For example, if you have two groups of plants, one that needs water only every 10 days and the other that needs water every four days, don’t group them together and don’t water them at the same time. One or both of the groups will suffer.
Jim May is with the Virginia Green Industry Council and the Virginia Department of Agriculture and Consumer Services.
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