Answer

In general, during Paryushan, it is best to avoid green tea, especially if one is observing stricter religious discipline.

Explanation

Green tea is not considered a simple necessity in Jain practice. During Paryushan, many Jains try to reduce indulgence and follow greater restraint in food and drink.

Whether green tea is allowed can depend on the level of practice:

• If doing upvas, ekasana, or strict tapasya: Green tea is generally avoided.
• If following boiled water only: Only properly boiled and filtered water is taken, usually within the permitted time period.
• If following a lighter discipline: Some people may take it, but it is not ideal from a Paryushan austerity perspective.

Also, green tea is usually prepared from plant leaves and may involve stimulation or taste enjoyment, which many devotees avoid during Paryushan.

Spiritual Understanding

Paryushan is a time for sanyam — self-restraint, simplicity, inner purification, forgiveness, and reduction of attachment to taste. So even if something is not heavily harmful, one asks: “Does this support my restraint and spiritual focus?”

Takeaway

If you are observing Paryushan sincerely, it is better to avoid green tea and take only boiled water as per your vrata or family tradition. For specific vows, follow the guidance of your guru, sadhu-sadhvi, or local Jain tradition.