Once I get house pants in and have to water them, I turn on the ceiling fan an hour or two a few times a week. No fungus = No fungus gnats. (The little can traps work, but I have used a water spray in the past in an old, empty spray bottle that has about 2 inches of ammonia stirred in, but I stand back and push the spray-handle lightly because too much would burn the leaves.)
Also, testing for seeds, I dump several seeds into a half-glass of water and leave it overnight. If the seeds are dried up and dead inside they float. If they sink, they're good and alive. It works.
Once I get house pants in and have to water them, I turn on the ceiling fan an hour or two a few times a week. No fungus = No fungus gnats. (The little can traps work, but I have used a water spray in the past in an old, empty spray bottle that has about 2 inches of ammonia stirred in, but I stand back and push the spray-handle lightly because too much would burn the leaves.)
Also, testing for seeds, I dump several seeds into a half-glass of water and leave it overnight. If the seeds are dried up and dead inside they float. If they sink, they're good and alive. It works.