Rita from Baltimore writes
While Captain Jacks Deadbug Brew Concentrate is safe to use on a variety of ornamental plants and flowers including orchids, cacti, and violets, it is not labeled for fungus gnats. You would instead either dry the soil out where the fungus gnats are a problem since they need overly saturated soils to thrive and breed in, or you could use a product like Talstar P to spray the plants and soil around them for the fungus gnat control.
Answer last updated on: 08/28/2017