Giving a special person a single rose?

well i have a really good friend and i really do like her and could see myself with her. we are always together in cl and shes really nice to me. i was planning on giving her a rose without her knowing its me but im not sure how to? ive told her in the past that i did like her but we both just decided that it wasnt a good idea at the time. would leaving a rose at her doorstep be a good way? or could you give me some advice on how to?