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Pittsburgh pa
Jan 15, 2018 8:19 PM CST
I have aloe plants and cannot get rid of gnats i have tried everything from Apple cider vinegar to house plant sprays to replanting... any other ideas???
Name: Karen
NM (Zone 7b)
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Jan 15, 2018 8:27 PM CST
Welcome to NGA! I assume you're talking about fungus gnats in your pots. They love it when your potting mix stays too wet for too long. Water much less. You can also add an inch or so of sand or gravel over the soil. I use the yellow sticky traps near the pots. Some potting soils come with gnat eggs ready to infest your new pot.
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Name: Baja
Baja California (Zone 11b)
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Jan 15, 2018 8:30 PM CST
Fungus gnats live in the soil for part of their life cycle. They thrive when the soil is moist. You can try watering less often during the winter, and that should make a difference. Let the soil dry out at depth before you water well. Your aloes can handle it, especially during the darker and colder days of winter.

You will get the fastest results from sticky flypaper placed near soil level. That doesn't eliminate the problem, it only affects the flying adults, but it makes a huge difference. Especially combined with changes in watering.

The gnats are going to get in by various routes, including potting soil, so you might think about where they're coming from and make changes there if necessary. They travel from plant to plant really fast, so all you need is one affected plant to get all of them going. But rather than focusing on control (elimination of all the gnats) it may be better to just knock down the number of insects in the flying horde (use sticky paper to remove the nuisance) while you make other changes.
Name: Christine
Saugerties, NY zone 5a
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Jan 17, 2018 8:14 AM CST
I know this will sound strange, but slices of potato's have always worked for me, just lay them across the top of the soil, they help to bring the larvae to them and the potato kills them off. I have since learned to watch my watering Thumbs up

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Name: Tiffany purpleinopp
Opp, AL 🌵🌷⚘🌹🌻 (Zone 8b)
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Jan 17, 2018 8:29 AM CST
Hi & welcome!

Ever since I stopped having any peat in pots, I haven't had gnats. Aloe + peat + gnats = my fear that your Aloe won't thrive, or worse. I would encourage you to use an unglazed clay pot, adding a lot of perlite to the soil you have, and/or investigating another kind of soil that does not have peat in it.

In the meantime, you can kill the gnats by adding BTi to the water that is used to moisten the soil, letting it soak at least overnight or longer, then applying to soil when it has become dry enough to need more water. Some popular brand names are Mosquito Bits and Mosquito Dunks. This kills the larvae in the soil and breaks the cycle of the larvae growing into the flying adults.

Be careful with vinegar around plants. The PH of the soil could be altered to a toxic level, and too much of it in direct contact with the plant &/or its' roots could kill it. Many "home remedies" for killing weeds recommend vinegar as an herbicide.
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Wyoming (Zone 4a)
Jan 20, 2018 10:36 PM CST
Potatoe slices only work if you REMOVE AND REPLACE THEM WITHIN TWELVE HOURS. Otherwise the larvae will just get nice and fat eating potato and compound the problem. Sand also helps, and diatomacious earth, but the biggest thing is to let the top 2inches get Bone dry(silly phrase, my bones are quite wet because I aggressively hydrate). Also, if they are coming in and out of your drainage holes, that creates a whole other problem, which is why you don't want drainage holes that wrap around the sides like on some tree pots

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