Well, spraying once does not remove scales. and depending on how serious the infestation is, it is a long fight.
It is a good idea to get the bugs out (if it really get them all which I doubt) in the long run, but I wouldn't ruin flowers just to get bugs at the moment. plus, scales usually are not found on the flowers and if you do find them there, then hand pick them. no need to spray flowers.
Also, drenching or using alcohol on roots are VERY BAD. Don't even think about it.
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