Possible Clues:

• Some enter a cemetery: a bit of a bloomer
• Invitation to compete with your setter — in flower arrangement?
• You could read this to mean I'm challenging you to a run? That would be some blooming arrangement!
• Flower cluster whose name can also be read as a challenge
• A cluster of stalked flowers emanating from the stem
• "To the end of the block! C'mon!"
• Flower cluster or sprinter's challenge
• Poinciana feature
• Flower-bearing shoot
• Run with Brummie's stalked cluster of flowers