I never knew flowers were rejected these days. Dang.
Perhaps red roses are more appropriate after you are engaged, or married, as they denote love.
Would yellow and white daisys be ok?
Candy is acceptable, so are books, stationery, a picture frame, maybe a candy dish or pretty vase, a little stuffed animal, or tiny statue of a dog or cat.
If a guy gives a woman jewelry, then, on the next occasion she will expect something something more expensive, and her expectations keep escalating with each successive gift. (If you are a multi-zillionaire ignore the above advice.)