Possible Clues:

• Went up; flower
• Thorny bush
• See 19-Across
• American Beauty, for one
• Part of the American Greetings logo
• Pinkish shade
• Followed a standing order?
• Garden flower
• ''That which we call a ..., by any other name would smell as sweet'' (Romeo and Juliet)
• Gift for a diva, perhaps