I hate to say if it would cause the flowers to drop or not , I have used alcohol on blooms on a Sharry that was outside for aphids it did not seem to hurt the flowers , but that does not say the sprays won't, I would try what you decide to use on one bloom. I am a systemic user Orthene WP. phew ! or the Bayer . But I don't grow in the house . cb Sue uses the Listerine maybe she will chime in . if not PM her .Take no prisioners.. Gin