Possible Clues:

• The yellow one is Hawaii's state flower
• See 17-Across (In this answer, see letters 1-2)
• Genus of malvaceous plants
• Is copper being entertained by Scottish football club making a bloomer?
• Largely tropical flower
• Large-flowered plant of the mallow family
• Large colourful flower
• The man's filled up with endless biscuits - such a bloomer
• Genus of mostly tropical plants
• The rose mallow