Possible Clues:

• Source of terrible cheek about high-class plant
• Edible flower whose bulb has a toxic core
• Bulb that rarely needs to be replaced
• Flower blooming, nothing less, up on border
• Upset eating middle of mouldy bloomer
• Union insolence — it arises in spring
• Flower that appears naturally in all colors but pure blue
• Flower from a bulb
• Spring-blooming perennial flower (from Amsterdam?)
• Flower celebrated in Holland, Michigan