Which rose should I give?

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I have a very sweet friend in my college.We both are very good friends indeed and we have good faith on each other.As in the previous discussions I discussed about our situation but to remind the new comers.....I love her but don't know whether she loves me or not.The problem is that I tried to find out by so many ways my friends on mylot told me to find out but still I am confused.Now and then she demands for a flower from me.I thought to give her a red rose on this valentine but due to some unavoidable reasons we didn't happen to meet on that day.she is demanding that now.No...It is not that she knows I wish to give her a red one.So I don't understand as to which rose should I give.The valentine is over and I missed a chance.So will it be OK to give her a red rose or should I give her a yellow one only.Plz guide me....