You can consider several factors while choosing the seeds, but there is no way to know if they will germinate seeds into a plant with a 100% success rate just by looking at them. These factors could include: Color: Healthy, and quality cannabis seeds would be darker in hue.  Firmness: Generally, a single seed with a tough shell is preferred to one with a soft, pulpy shell.  Luster: Cannabis seeds for sale in the USA are also intended to be round and shiny. Trying to get flat seeds won’t work. Additionally, notice if the outside of your seeds is waxy. For good outcomes, having that waxy, protecting sheen is essential.