Possible Clues:

• Spots Diane inside plant
• Vegetable is hard to cultivate
• Salad ingredient, perhaps
• Pungent salad ingredient
• Artist having meal wants edible root
• Daikon or mooli
• Vegetable pot used as base by artist
• Red cold salad ingredient
• Artist with lovely vegetable
• Vegetable in unfinished, uncooked Sushi, for instance