In Jainism, "Kalpavriksha Tap" (also spelled Kalpvriksha Tap) is a special form of austerity (tap) that is inspired by the mythical "Kalpavriksha"—the wish-fulfilling tree described in Jain scriptures as existing during the early eras (Utsarpini) of the present time cycle. In those eras, people received all their needs effortlessly from the Kalpavriksha, without having to work or struggle.

Kalpavriksha Tap is a spiritual practice undertaken by some Jain ascetics and lay followers to cultivate detachment and minimalism. The practitioner emulates the lifestyle of those ancient times by depending entirely on what is spontaneously offered to them, without asking or expressing any desire. They resolve to accept only whatever comes to them naturally, just as people in the era of Kalpavriksha accepted what the tree provided.

Key aspects of Kalpavriksha Tap:

• The practitioner does not ask for food, water, or any material needs.
• They accept only what is voluntarily offered by others, without any prior request or indication.
• This practice emphasizes the Jain ideals of aparigraha (non-possessiveness) and contentment (santosh).
• It is considered a difficult austerity that helps in reducing desires and karmic bondage.

Purpose: Kalpavriksha Tap is not merely about physical deprivation, but about cultivating an inner state of non-attachment and surrender to the flow of life, reinforcing faith in the law of karma and the path of renunciation.

This practice is generally observed by advanced Jain monks or highly disciplined lay practitioners, especially during special periods of penance or spiritual retreats.

If you would like references from Jain scriptures or more details about this practice, please let me know!