This is the retiring Garden in Bloom stamp set (available while supplies last or until May 31st).
Guess what?! The flower from this stamp set coordinates with the NEW Share What You Love designer paper that's in the 2018-2019 Stampin' Up! catalog. Here is a card I made using both the flower stamp and the designer paper.
You can order this designer paper NOW during the Early Release of the Share What You Love bundles. See all of the details (including photos of a FREE Card Kit) here.