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What is a wallflower plant?
A wallflower plant is a species of flowering, herbaceous, perennial, plant of the genus Erysimum. (1)
A Wallflower plant is also known as Erysimum cheiri, or Cheiranthus cheiri.

Where is the wallflower plant native to?
native to southeast Europe (1)

1. https://en.wikipedia.org/wiki/Erysimum_cheiri