Gardening - Harvesting

[Lyrinn]

• How exactly does it work? Does eating one allow your chocobo to go past the current level cap and gain XP normally or is it the only food that gives XP once it's capped?
• How many onions are produced per plant?

Just harvested the one I planted and yield is 1, as expected. I'll get back to you on how it's used because it isn't my onion.