Possible Clues:

• Chrysanthemum or rhododendron
• Its forte is blooming well further down
• A rose, for example
• Lapel insert
• Fellow has to haul down flag, for example
• Blooming deeper down to the bottom
• With frost, a garden favourite
• Rose, e.g
• 22 down's upset about womaniser
• The dove's-foot crane's-bill, for instance