Herbs grown in containers tend to dry out more quickly than those grown outside. But don't worry; it's easy enough to check their status. Simply stick a finger into the soil. Make sure you get at least get half an inch below the surface to feel the moisture.

If the soil feels dry to the touch, then water the plant. As much as you may be tempted, don't overwater these indoor herbs. You'll only be promoting root rot and the development of a disease called powdery mildew.

This plant disease is probably one of the most recognizable. If your herb is afflicted, it will have powdery splotches of white or gray on its leaves and stems.