Overwatering in potted plants is of the most concern, as they are in a captive habitat and it's really a fine line with many species of plant. While we know plants need water, even cacti, the exact amount and frequency may be something of a mystery. Container plants with too much water may experience foliage die off, rotten roots and tubers, and promotion of some pests or mold issues. An obvious method to prevent overwatering in potted plants is with the use of a moisture meter, while a low tech solution is to get your fingers grimy, wherein you push a finger into the soil up to the second knuckle or test the bottom of the post through a drainage hole.

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Source: Gardening Know How