You will be very surprised by how quickly these gnats will destroy your plants. In about 3 - 5 weeks left alone they will kill a plant.

Unchecked I have had a house plant almost completely die from them. 80% of the plant suddenly died so I washed the soil off the roots and replaced it.

I even attacked the little bastards with chamomile and neem oil... even after I washed to roots !

You don't need to wash the plants if you catch them early with the neem oil. But this plant was very near total destruction though. It still lives today !!!