Strobilanthes wallichii, commonly known as Kashmir acanthus, 

 Persian shield, wild petunia, or kandali, is a herbaceous 

 which is native to the Himalayas. In its natural habitat, it purple blooms appear only once every twelve years, an occasion which is celebrated by the Kandali Festival in the Pithoragarh District in India.

Strobilanthes wallichii, commonly known as Kashmir acanthus, hardy Persian shield, wild petunia, or kandali, is a herbaceous perennial which is native to the Himalayas. In its natural habitat, it purple blooms appear only once every twelve years, an occasion which is celebrated by the Kandali Festival in the Pithoragarh District in India.

https://en.wikipedia.org/wiki/Strobilanthes_wallichii

Strobilanthes wallichii

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