Some people referred to the plants in VV3 by the color of the flower before they discovered that there were names for them. These are plants in VV3, but by color, not by name.

Unfortunately, the post where Seahorse mentioned the orange and purple herb (along with the cactus) was not correct about the effect.

debgramberk, there is a map of the herb locations in the VV3 guides that should help you.