Be careful with this ... unexpected delivery of flowers for no particular reason might trigger a full blown resentment event for something you weren't aware of doing but the women was building a case around. Resentment interruptus is very irrating to some women.
I might have added that a man ought never send a woman flowers for a reason that is not immediately evident to her (e.g. - birthday, anniversary, holiday). Otherwise, she’ll think you’re making up for something she doesn’t yet know you did, but boy is she ever going to find out, and when she does....