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Old 05-14-2012, 08:05 AM
 
Location: Angier, NC
130 posts, read 418,220 times
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We have a few indoor herbs that have attracted fungus gnats (I presume from overwatering). We grew them from seeds. We have since put the herbs outside to let them dry out, and in hopes of ridding them of the fungus gnats. It has been over a week now and the gnats are still there.

Does anyone have any tips on getting rid of the gnats so we can move the herbs back inside? I have heard of sand, pesticidal soap/etc. but am unsure if that is okay since we will in fact be consuming the herbs.

I guess the other option is to completely start over with new seeds and attempt to control the problem from the beginning, rather than after it has already started.
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Old 05-14-2012, 09:17 AM
 
2,063 posts, read 6,263,312 times
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Originally Posted by Riley14 View Post
We have a few indoor herbs that have attracted fungus gnats (I presume from overwatering). We grew them from seeds. We have since put the herbs outside to let them dry out, and in hopes of ridding them of the fungus gnats. It has been over a week now and the gnats are still there.

Does anyone have any tips on getting rid of the gnats so we can move the herbs back inside? I have heard of sand, pesticidal soap/etc. but am unsure if that is okay since we will in fact be consuming the herbs.

I guess the other option is to completely start over with new seeds and attempt to control the problem from the beginning, rather than after it has already started.
The fungus gnats are still hatching out and will take a while to get less but will probably always be a bit of a problem. They like moist nutrient rich soils that support fungi which is why letting the soil dry out between watering (at least down to an inch or two of the soil) helps keep their numbers lower. You'll need to keep that upper soil dry more than not for at least another week or two while waiting for the last ones to hatch out.

Most of the available fungus gnat controls would not be healthy for you to consume since they are designed for houseplants. If you really want to keep the gnats out it may pay to re-pot the herbs or start again with a sterile medium or soil that has no compost or other decaying matter in it and watch the moisture levels.
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