Hey ~ well, if you're doing the reading the parts of a rose can represent whatever you'd like. For example, ask that the straightness of the stem show you how honest a friend is being with you, and it will. I can however tell you about the rose reading taught at Berkeley Psychic Institute. Lemme quote you some bits from our 'welcome' sheet...

"The rose is the central figure in this picture. It symbolizes you. How open the flower is tell us how open you are on a psychic level and how open you are as a personality to new information. The length of the stem on this rose indicates how long you have been taking bodies on ths planet. The leaves on the stem indicate the probable number of children you, as an entity, may have considered having int his life. This is in no way binding, as there is free will. Prominent bands on the stem of the rose indicate lives that are pertinent to this life and to present growth.

There is a sun in the left corner of the mock-up which symbolizes your energy source, the God of your heart (your own concept of God). We look at the rose in relationship to the sun to determine how in touch you are with this source."

The reader generally tells you what these mean for you personally, though, and will add other relevant communication. Hope this helps!