Like an immaculate lawn or a perfect marriage, an ideal indoor garden is almost impossible to achieve. But there are ways to get closer to heaven.
Dry air poses a threat to plants, and to human throats and noses as well.
To boost humidity, set out a tray about five inches deep on a radiator or fireplace and fill it with plain gravel, pretty pebbles or last summer's collection of seashells. Cover it with an inch or so of water. Misting substitutes nature's nocturnal dew. It also increases humidity and is especially useful for plants with smooth leaves. Some indoor gardeners believe potted plants are happier when huddled close together.