Answer

If by “kanmood” you mean kandmool / root vegetables, Jain tradition generally avoids eating them because pulling them out destroys the whole plant and also harms many tiny living beings around the roots, which goes against the Jain principle of ahimsa (non-violence). ( jainsamaj.org)

Explanation

A simple way to identify kandmool is: if the edible part grows under the soil and must be uprooted to eat it, it is usually treated as kandmool in Jain practice. Common examples listed in Jain sources include potato, onion, garlic, carrot, radish, ginger, sweet potato, and yam. ( jainworld.jainworld.com)

Spiritual Understanding

The Jain reason is not only about food choice; it is about reducing harm, increasing self-restraint, and keeping the mind gentle and pure. By avoiding kandmool, a Jain tries to minimize violence at the level of both the plant and the tiny life around it. ( jainworld.jainworld.com)

Takeaway

Practical rule:

• Grows above ground and can be picked without uprooting the plant: generally not kandmool.
• Grows below ground and must be pulled out from the root: usually kandmool. ( jainsamaj.org)

If you want, I can also give you a short Jain-safe list of common vegetables to avoid and vegetables that are usually allowed.