Pachycereuspringlei (CardonGigante) is part of a group that's renowned and revered for its unique architecture and massive size. Check to see if your Pachycereus Pringlei turns yellow or has a distorted look. You can find my recommendations on where to buy these succulents and others online at the Resource Page. If the roots are light brown, it is likely that they have dried out. Euphorbia prefers sunlight to artificial light, so it should be avoided being placed in dark areas. The direct sunlight is ideal, but it is important that the room be well lit and receives enough natural light.