Answer

No. Hydroponic onions or garlic are generally not considered Jain food.

Explanation

In Jain tradition, onion and garlic are avoided regardless of whether they are grown in soil or hydroponically. The main concern is not only the method of cultivation, but that they are bulb-type underground vegetables and are traditionally prohibited in a Jain diet.

Spiritual Understanding

Jain food principles aim to reduce harm to living beings and to support purity, restraint, and non-violence. Because onions and garlic are traditionally excluded, hydroponic growing does not make them acceptable in a strict Jain diet.

Takeaway

If you are following Jain dietary practice, it is safest to avoid hydroponic onion and garlic as well.