1. You can talk to them and they won't talk back 

2. You can never have too many of them 

3. Having lunch with them is cheap. They just drink water.

4. They grow, but won't grow away from you 

5. They're always down to hang out 

6. They don't judge you 

7. If you tell them they're getting too big, they don't care. They just want a new pot.

8. They can make the air you breathe cleaner, unlike friends, especially the ones that smoke 

9. They're always in your house, but you're not annoyed by it 

10. They're easily replaceable. If something happens, just get another one!