• 3440
    • Knock-Out Gnats™ Granules - 4 oz (makes 15-125 gallons)
    • $29.99

Knock-Out Gnats™ Granules


Stops fungus gnats in greenhouses

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Product Details

Fungus gnats love to lay their eggs in humus-rich organic soil and potting media, making them a real problem if you grow lots of houseplants or have a greenhouse. With Knock-Out Gnat Granules, the larvae ingest the larvicide and die before they can harm your plants. Take that, you annoying little…

Customer Reviews

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no more gnats!

Jan 23, 2016  |  By Megan Lim
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My worm compost bin was infested with fungus gnats and I couldn't get rid of them! I spent months trying to kill hem but it wasn't enough. 3 applications of knock out gnats and the gnats were gone for good without harming the worms!



Love this product

Jun 23, 2013  |  By mark
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I work in a sealed office building (cannot open the windows). Over the years people brought in gnats with their plants. Since the office is sealed, natural predators cannot get at the gnats. I found this product here when desperate for something to knock down the gnats. I had been warned I would have to remove my plants otherwise. It worked quickly. Periodically I would refresh it with a simple watering of this product. I used it on the plants of some coworkers when they let me. I ask management to authorize me to use it on the other plants in the office. Still waiting for that. But at least management knows this product exists. Without question it kills the baby gnats breeding in the soil of the plants. Here back for more of it.



knock out gnats

Feb 26, 2013  |  By Rebecca
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This product is very useful to me, please continue to allow it to ship out to the state of California. I have a severe problem with gnats and the larva need to be controlled. I still have some of it and I noticed a major decrease in the gnats after I used this product within two days. I want to order more in the future to send here to California. Thank you.


    • 3440
    • Knock-Out Gnats™ Granules - 4 oz (makes 15-125 gallons)
    • $29.99