Potting soil doesn't need to be replaced every year. But the soil does need to be amended to ensure the dirt drains well and there are enough nutrients in the soil. ... Old potting soil can often become compacted and shrink away from the sides of the container. This prevents the soil from draining properly.

How often should you change out potting soil?

Usually, you need to change soil in indoor plants as often as every 12 to 18 months. Exceptions make repotting, when you move the plant into a bigger pot because it no longer fits into its current pot, or when the soil becomes very hardened. You should not change soil in indoor plants more often than once a year.

Is it OK to reuse old potting soil?

It's generally fine to reuse potting soil if whatever you were growing in it was healthy. If you did notice pests or diseases on your plants, it's best to sterilize the mix to avoid infecting next year's plants. First, remove any roots, grubs, leaves, and other debris from the old potting soil.