Herbal Essences is partnering with the Royal Botanic Gardens, Kew, an authority on plants, to help save 20 endangered US plant species from extinction in 2020. Debuting at SXSW on March 13, Herbal Essences will make this pledge to raise awareness and inspire others to act on the issue of plant biodiversity loss.   An Often-Overlooked Challenge   Due to a cognitive bias, people are wired to overlook plants, a phenomenon called plant blindness, and thus, plant extinction is often not addressed. Ba...