The number one killer of house plants is most likely over watering. Unfortunately, there is no general watering schedule that can be recommended for all indoor plants. Light, temperature, humidity and size of container all play a role in how fast the potting mix dries out. Varying potting mixes also play a role. Consider these watering tips.

 

 * A good rule of thumb is to gauge the soil moisture by color and feel. If the potting mix is light colored, cracked and pulled away from the pot, the soil is too dry and roots may be damaged. If it is dark and slimy, it is too wet, and root-rotting organisms may become a problem. The presence of fungus gnats can also indicate that house plants are being over watered.

 

 * The best technique to use for monitoring when to water is to probe a few inches into the potting mix with your index finger. When watering, soak the pot until water comes out the container’s drainage hole. After an hour or so, remove and discard the collected water from the catch basin. Flowering plants will generally need more water than foliage plants. Plants that are exposed to sunlight or placed closer to heater vents also tend to dry out more quickly.

 

 * Tap or well water is usually satisfactory for watering house plants. The levels of chlorine and fluorine added to culinary water will typically not harm plants. Water that is run through a water softener is not recommended. Soluble salts may build up in the potting mix, contributing to poor growth and possible toxicity. A white-crusted appearance on the surface may indicate high salt levels. To remedy this, an occasional deep rinsing with non-softened water will help flush out the salts.