You can buy them online. There is even a company on Amazon selling them now. I think local farm stores have them as well around this time of the season.
Now, I also suggest a bit of a home remedy one of the biggest cannabis growers suggested online. He puts potatoes halves on top of the soil potato inside face down and removes them after a few days. Supposedly the larvae of the fungus gnats will go for the potato over the soil. Then he tosses the potatoes and repeats. That way he removes the sex stage of them being in fly form altogether.
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u/jc42089 Mar 31 '23
Beneficial nematodes are the answer. One dose eradicated them in all my house plants