Thanks for mentioning it... I only had 39 gems, but figured I'd roll on the 5 gem and first 10 gem (since it has the increased drop rates).

For 15 flower gems I got:
6* Acacia
5* Tassel Flower
6* Dogwood
5* Greenbell
5* Watercress

All were new.

I don't think I'm going to bother spending 20 gems for guaranteed 5*s, will save them for future deals because that is so many units to level up... so crazy. Best 15 flower gems I have ever spent.