From a Jain dharma perspective, growing or farming method (including vertical farming) does not change the sacred guideline about certain plants. Jains generally avoid root vegetables because harvesting them harms many tiny life-forms and the plant as a whole is uprooted.

Potatoes are considered a root/tuber vegetable. Most Digambar and Shwetambar communities treat potatoes (and other underground tubers) as foods to be avoided, especially for those observing strict vows or during vrata. So, eating potatoes even if they are grown in vertical farming would typically not be considered okay in a traditional Jain practice.

If you want practical guidance:

• Commonly avoided: potatoes, onions, garlic, carrots, beets (root/tuber vegetables).
• Generally acceptable (depending on local custom and how strictly you follow vows): many greens, fruits, legumes, grains, and non-root vegetables grown above ground.

If you have a specific Jain tradition or guru you follow, I can tailor the guidance to that tradition.