In order to do it, you must become familiar with approximate weight of a well-watered pot. As the soil dries out, the pot becomes lighter. Recognizing the approximate weight when a particular plant needs water will allow you to quickly test it for water by lifting the pot as you pass by. Another sign of thirst includes fading of leaf color to a dull green. The number one problem with most houseplants is probably over-watering.
Plants tend to prefer being slightly dry rather than too wet.
If the soil holds too much water and doesn't provide adequate air to the root system, then the conditions are ideal for fungal growth which cause root rots. Providing good soil will go a long way toward promoting a vigorous root system. The roots supply not only nutrients and water to the plant, but it is also necessary for support. A well-developed root system allows a plant to stand upright. The key is starting off with a good, well-drained potting mix.