However, it may be another 3 - 7 days before you see a seedling emerge from the soil, so be patient. When selecting a potting soil for your plants, you ll need to choose a light and airy substrate low in nutrients. SunWest Genetics Among the Best Cannabis Seed Banks for Quality Genetics. Source: https://we.riseup.net/jonfllman/choose-your-desired-thc-levels