Might depend on what kind of orchids you're thinking about using it on. I've both sprayed and poured insecticidal soap on a variety of orchids without them having an ill effects. Cattleyas, laelias, cymbidiums, dendrobiums, vandas and aerides were all fine with having their pots drenched with it. My not-so-great experiences with insecticidal soap involved gongoras. For some reason--and this could just have been with the plants that I had, and not necessarily the genus as a whole--they didn't react favorably to being sprayed with the soap (and after seeing how their leaves developed unsightly blotches from my application of the soap, I wasn't about to push my luck by pouring any into their pots/baskets). In my experience, insecticidal soap's been a fairly benign product (and it's a lot less prone to do nasty things to the environment, which is always a good thing in my opinion). Try it on one or two of your plants (if there are a couple that you could bear to live without, those would be excellent candidates for experimentation) and see how it goes. Good luck!
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