You may be over watering if any or all of the below are true:
You plant has wilted, yellow leaves
Your plant has yellow leaves that are dropping off
The leaves look limp and don’t perk up within several hours of watering
Your plant smells musty or moldy
Your plant starts attracting insects
You notice spots or blisters on the undersides of the leaves
More plants are killed by over watering than dehydration. Over watering is extremely common because first-time plant parents usually assume that more water will always make their plant baby happy. Unfortunately, over watering is also harder for plants to bounce back from. Once root rot (marked by blisters on the undersides of the leaves) sets in, there may not be much you can do except take some trimmings to propagate a new plant. If you’ve over watered but the plant is still holding on, repot it with fresh soil right away. Then go back and read the section on the right way to water and thank Mother Nature that you’ve been given a second chance. On the other hand, when you forget to water, a little TLC and a long drink will usually bring your plant back to the land of the living. Just don’t drop the ball too frequently or the stress may prove fatal.