What causes a gnat infestation?

Related questions

1. What are these gnats in my house?
2. What is the point of silent letters?
3. Is T silent in mortgage?
4. Is the G in GNU silent?
5. Why is the G in Gnome silent?
6. Where do house gnats come from?
7. What is the purpose of gnats?
8. Where do gnats come from in your house?
9. Why are gnats in my home?
10. Why do gnats bite?

Tags

1. #houseplants
2. #decaying
3. #attracted
4. #roots
5. #infest
6. #gnats
7. #flying
8. #homes
9. #infested
10. #plant
11. #inside
12. #damaged
13. #fungi
14. #brought
15. #house
16. #usually
17. #found
18. #fungus