Possible Clues:

• It’s excluded from part of elevenses in his plant
• Colourful flower
• Plant the fellow's, having potted brown — it's missed!
• Large showy flower
• Plant of the mallow family — cub is his (anag)
• Eggsotic bloom
• Garibaldi, perhaps, dropping it in his herbal tea
• Hula dancer's accessory
• Her companion admits it can be nice missing it, as it belongs to the Mallow family
• Mallow plant — cub is his (anag)