I understood from Manusmriti 5.5 that following veggies are to be avoided
Garlic, leeks and onions, mushrooms and all that proceeds from impure things, are unfit to re eaten by twice-born men.—(5).
But what about vegetables that were introduced to India in recent past - e.g. Potatoes
When it comes to unknown animals or birds, the scriptures make it abundantly clear that they are to be avoided - Manusmriti 5.17
He shall not eat solitary animals, nor unknown beasts and birds, even though indicated among those fit to be eaten; nor any five-nailed animals.—(17).
But looking for pointers on vegetables and fruits not native to Bharata.