Reasons Your Houseplants Die 

The unexpected death of plants can result from a variety of causes. Here are the top reasons houseplants die

Not Enough Light.

If your plant's leaves are turning yellow or if they are falling off, it may be lacking in sunlight. Most house plants need a minimum amount of sunlight to grow..

Watering the wrong way.

If you forgot to water for a few days, it’s possible that the roots dried up. , the opposite is more likely, as too much water is often to blame for dying container plants.

Too much fertilizer

Houseplants may suffer if they receive too much fertilizer. Overfertilization can actually slow plant growth, leave them weak, and make them more susceptible to pests and diseases.

The air is too dry

Too little humidity will sometimes impede a plant's growth and cause it to have difficulty absorbing water later on.

You think it's dead.

Plants may regenerate after harm, and many tropical plants slumber seasonally because to wet and dry seasons in their native habitats. Just because a plant appears ill or loses its leaves does not indicate that it is dead.

Pests

A few bugs will not cause much damage, but if left unchecked, they will grow and turn your favorite potted plant into an unsightly mess, or even kill it.

No growth

Another possibility is stunted growth, which can occur if you haven't repotted your plant in a long time. Plants should be repotted as they grow if possible.

Too much sunlight

Yes. Many plants flourish in partial sun or shade and will die if exposed to too much sunlight. The sun can also cause plants to burn and eventually die.