In Jainism, ginger is generally avoided because it is a root vegetable.

Reasons:

• Ahimsa: uprooting ginger harms many tiny living beings in the soil and also destroys the whole plant.
• Kāyotsarga / restraint: Jain food rules avoid foods that involve more violence.
• Root vegetables are restricted in many Jain traditions, along with onion, garlic, potatoes, carrot, and others.

So, ginger is not eaten mainly because it is a root and its harvesting causes more injury to life.

Some Jain traditions may follow these rules more strictly than others, but the basic principle is the same: minimize violence and attachment in भोजन.