Possible Clues:

• Slit up the Spring flowers
• Garden flowers associated with Amsterdam
• Early bloomers
• Subject of an annual Ottawa festival
• Bulbiferous blooms
• Bulbs that may not need to be replaced
• In plants uranium has leaked across – it's all over!
• Bloomers dropped, pulled up to cover bare bum
• Sheep rounding left one making bloomers
• A fair amount of turf and borders for flowers