Why Jains do not eat onion and garlic?

Online Answer
Vegetables like Onions and Garlic come under the 'tamasic' category which means they have the quality of darkness. This kind of vegetables grow underground and are home to many unseen organisms who live under the soil. To avoid any kind of harm to these organisms, Jains don't eat onions and garlic.
Related Questions 📌
Kept in the dark: Davison says your potatoes should be stored inside a paper bag in a cool, dark, dry place. And as mentioned above, away from onions and their sprout-encouraging gases.
There are many ways of using garlic.
Keep them in the dark: Potatoes and onions are best stored in the dark in a cool place (separately of course).
Onions contain antioxidants and compounds that fight inflammation, decrease triglycerides and reduce cholesterol levels — all of which may lower heart disease risk. Their potent anti-inflammatory properties may also help reduce high blood pressure and protect against blood clots.
While the fridge isn't ideal for storing onions, it will extend the shelf life of whole, raw onions beyond a week at room temperature. Onions absorb moisture very easily however, so their texture may get somewhat soft in the fridge. Whole, raw onions can last in the fridge for up to two weeks.