Answer

Yes, generally you may eat coconut during a Tithi if your specific Pachchakkhan/niyam is only to give up green vegetables.

Explanation

In Jain practice, the rule depends on the exact vow you have taken.

If you have taken a vow such as:

• “I will not eat green vegetables today,”
• or “Lilu shak nahi khavu,”

then coconut is not normally counted as a green vegetable.

However, you should be careful about:

• whether it is fresh coconut or processed/dry coconut,
• whether your family or Guru’s tradition treats it differently,
• whether the Tithi rules you follow include other restrictions beyond green vegetables.

Spiritual Understanding

In Jain Dharma, the purity of a vow depends on clarity. If the vow is only for avoiding green vegetables, then only that category is avoided. But if you are observing a stricter Tithi niyam, such as avoiding certain fresh items or following special dietary discipline, then you should follow that stricter rule.

Takeaway

If your vow is only “no green vegetables,” coconut is generally allowed. But if you are unsure, follow the guidance of your Guru, family tradition, or the exact Pachchakkhan you took.