Before you even germinate your jack herer cannabis seeds, selecting the right soil mix is critical to your success. A well-aerated, slightly acidic medium with a pH between 6.0 and 7.0 is ideal. Many experienced growers recommend combining high-quality potting soil with perlite at a ratio of roughly 70/30 to improve drainage and prevent root rot. Adding worm castings or aged compost to the mix introduces beneficial microorganisms and slow-release nutrients that will feed your plants naturally through the early vegetative stage.