Possible Clues:

• Plants, variety found in shady ground
• A shy criminal will import wild garden shrubs
• Shrubs cultivated for their domed flower heads
• Shrubs faring badly in ashy garden
• Shrubs in shady ground either side of mountains
• Cover up QPR broadcast bloomers
• She and Gary disastrously will make bloomers
• Garden shrubs
• Unusual garden has to include the latest in fancy shrubs
• Flowering plants; ashy garden (anag.)