Yes! You can re-use potting soil...if you rejuvenate it:
1. It has a foul smell
2. It has any insects
around it continuously
3. It is infected through some disease (for example, if your plants were sick last year)
4. It is dense and compacted
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Learn how to rejuvenate your potting soil, step-by-step, and what you need to add for plant health.