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Mix one part 3% hydrogen peroxide with four parts water. Allow the top layer of your soil to dry, and then water your plants with this solution as you normally would. The soil will fizz for a few minutes after application; this is normal. The fungus gnat larvae will die on contact with the hydrogen peroxide.
yes, it is bad for the environment and can cause all kind of disease that would probably get blamed on something else. Good soil invites worms that produce what the soil needs to support plants poisons kill the microbes in the soil and the worms leave.
I know this is an old post and I didn't see it until now. I missed helping last year, but if you have the same question....
They grow best in rich, well-drained soil with a basic pH (they like more alkaline than acidic). If your soil is naturally acidic, adding lime will help to provide these conditions. They are also heavy feeders. The addition of compost or manure to the soil as well the use of granular fertilizer will result in healthier, stronger plants.
It could be that the container they are in is too big. The top layers of soil are the first to dry up so if a container is too large for the plants, the nutrients and water could be washed down beyond the smaller plants reach. I would start by having the soil tested at a local plant and tree nursery. Over time minerals and salts can build up in soil to levels that may be tolerable for a larger plant that has grown in that soil it\'s entire life, but will mean doom and death to smaller plants or different types of plants. If the soil tests ok,. then I\'d try a smaller container. I\'m no expert, this is just from my own experience. Hope it helps.