Possible Clues:

• It has florets
• Vegetable often served with dip
• Vegetable oil runs beneath half-broken engine size
• Sibling with abdominal pain throwing up cold vegetable
• Vegetable with tightly packed green or purple flower heads
• British Rail taking over carbon and caught with oil upset Greens
• Brother with cold gets cloudy oil extract from the vegetable man's stall
• Brother up front takes the wind out of this vegetable
• Brother has awful colic – from vegetable
• Garden harvest