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How often should I use my soap/garlic spray?

10 years ago

I've had good luck using a water/soap/oil/garlic juice spray on my roses, petunias and marigolds that were being attacked by spider mites. (The garlic is supposed to deter them in the future; I have no idea if it actually does that!)

That was a small infestation compared to the group of eight neglected-until-this-year rose bushes at the side of our house. I sprayed them last night, and am now wondering how often to do it. For the other flowers, I sprayed every three or four days, but I'm wondering if it would hurt anything to do an experiment and spray every night for several days, each time "getting" bugs that didn't happen to be around the night before.

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