Possible Clues:

• Have fun with egg plant
• Birds sound contented mostly, finding flowering plant
• Plant gives incentive to high-flier
• In the garden, birds imitate cats, reportedly
• Buttercup cousin
• Flower like a delphinium
• Mediterranean plant of the buttercup family
• Flowers unblemished, almost, after fun and games
• Flower (named after excrescence on a bird?)
• Plant with flower spikes