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Ha, great question!!! How can I decide?

Vegetable: Eggplant
Herb: Basil
Flower: Grevillea

BUT!!!! I can't eat eggplant raw, and there's more special medicinal herbs, and nicer smelling flowers, so:

Vegetable: Fennel
Herb: Withuania (Indian Ginseng)
Flower: Rose

Under different criteria, I'd choose different ones! Thanks for asking - fab question, and impossible to answer!