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This pretty little plant is carnivorous, so when placed next to plants affected by the insect pest it can be an effective living flypaper
The problem
The fungus gnat is the pest that just keeps coming. You dry out the soil, set up sticky traps, maybe even reach for the hydrogen peroxide, and just when you think you’ve have won, they’re back. The adults are harmless but maddening, drifting around your face and laying the next generation in any damp compost they can find. And most controls only deal with one stage of the cycle and leave the rest to carry on.
The hack
Butterworts are small carnivorous plants whose leaves are coated in a sticky mucilage that traps tiny flying insects, including fungus gnats. Keep one or two among your collection as living flypaper, catching adult gnats before they can breed.