Commercial greenhouses typically remove all the plants in the winter, and maybe all the soil too, and then fumigate with really strong chemicals to reduce mites and aphids to an annoying memory. I have plants in the greenhouse year round so I can't destroy the bugs like that. This year, my greenhouse was too dry because I was doing an experiment that sent all the irrigation water under the soil and spider mites proliferated. I tried organic insecticidal soap and a 3 in one thing that was supposed to reduce fungal infections, insects and mites, and it did nothing. Recently I tried fumigating by burning dried nettle leaves. (I read somewhere that nettle leaves are insecticidal and kill mites too). I think it worked a bit. but I was pure guessing how dry to have the leaves and how hot to burn them. I have drawn up a list of home grown plants and substances to try, So, burn rosemary? or atomize rosemary oil? Burn mint or atomize the oil? Same with fennel, and rose. How about burning ivy or holly? or if the infestation is really bad, how about burning daphne in the greenhouse? (Daphne Laurel when I cut it, it makes me feel a bit sick, and I looked it up, it contains things that are being researched as insecticides, miticides, and cancer killers. So, maybe use it in the greenhouse. I forgot the tobacco. Could I soak dehydrated tobacco in water and vaporize it in the atomizer in the rafters too? I can do the essential oil things now because I have a solar distiller and it does 5 or 6 ml of hydrosol per hour. Then I can put the atomizer up in the rafters of the greenhouse and let it work all day. Anyway, have any of you used natural fumigants with success? I can't grow neem so please don't suggest it, lets keep it to home grown solutions please. So, please let me know what you tried and if you had success with it. Here is the video of me smoking up the greenhouse.
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