Possible Clues:

• Vegetable related to the onion
• Sounds as if water is coming in, so the ship goes bottom upwards
• It's a sign of the Welsh League, I'm afraid!
• Sounds as if water may get through the back of the bottom of the ship
• Green vegetable
• It was for Wales to have made it turn bottom upwards
• Welsh root
• For Wales it's bottom up in Ireland
• Scallionlike vegetable
• Vegetable symbol of Wales