Lost in the Forrest
Diatomaceous Earth
$8
Sprinkle some Diatomaceous Earth on top of your soil to help get rid of those annoying fungus gnats. Bottom water to help get best results. Apply as needed. Diatomaceous Earth is non-toxic and safe for home use.
It works by causing insects to dry out and die by absorbing the oils and fats from the cuticle of the insect's exoskeleton.