Plant stem cells are cells that naturally occur within plants, that are able to transform into various different cell types - essentially driving regeneration of the plant.
The plant stem cells used within skincare, however, are not live cells - so they do not regenerate our skin as such, but they do contain extremely high levels of antioxidants and anti-inflammatories, which help protect our skin barrier and prevent aging. Due to their lab-cultivated nature, plant stem cells are pure and uncontaminated and have very little impact on the environment - using less water, and generating less waste than cultivation of the plants themselves.