Answer

In Jain practice, lotus stem is generally avoided because it is a root/underground-type vegetable.

Explanation

Jains traditionally avoid root vegetables because:

• Uprooting them can destroy the entire plant.
• They may contain many minute living organisms.
• Eating them may involve greater violence compared to fruits, grains, and above-ground vegetables.

Lotus stem grows in mud and is taken from the root/rhizome part of the lotus plant, so many Jain families and traditions do not eat it.

Takeaway

For a Jain diet, it is best to avoid lotus stem, especially if you follow strict Jain food discipline.