इमां खनाम्योषधिं वीरुधं बलवत्तमाम् । ऋग्वेद: सूक्तं १०.१४५
“What I dig is very potent herb to increase strength.”

Excuse my faulty translation but there are interesting dots to connect.

1) शारीरिक & प्राणिक बल are necessary to earn पुरुषार्थ (धर्म,अर्थ,काम,मोक्ष) and perform our duties towards the Universe with least errors.

2) In my understanding, when grown in soil nurtured and kindled with Prana(प्राण) by gobar, mutra and butter milk of Desi Gau, Vegetables from कंद वर्ग (the ones that we dig) grows in the epicenter of rich Pranic environment. And this Prana is not Raw Prana like other vegetables and fruits get from the Sun by photosynthesis and external environment. It is digested Prana or churned prana. Churning prana makes its potency manifold. So they are full of प्राणिक बल. Since they are the roots, they have most possible essence of all physical nutrients.

3) कंद वर्ग’s vegetables is main food for ऋषि पञ्चमी. That means, to nurture the ऋषि अंश settled at our subtle senses can realize their full potential with the help of कंद वर्ग.

4) In most cases, you dig them only when they plant completes its life cycle. For example, I dig my turmeric only when all its leaves are dried and gone.

Keep an eye on seasonal कंद वर्ग vegetables and include them in your meals. Of course, nothing worth without Gau mata.

जामवंत के बचन सुहाए। सुनि हनुमंत हृदय अति भाए॥
तब लगि मोहि परिखेहु तुम्ह भाई। सहि दुख कंद मूल फल खाई॥