Thanks Top and Alex! Here is updated list:
1. Long vase life
2. Store and open well
3. Vigor and ease of growth producing many stems for cutting
4. Stem quality (strength, length, straightness)
5. Consistency and uniformity of blooms (color, form, size)
6. Resistance to weather extremes
7. Scent
8. Novelty
How do you rate the above factors? I guess the rating can change according to your objectives as a grower and producer of cut flowers. For me as a gardener, I may rate differently than the order above.