Cannabis seeds have a unique shape. We typically recommend transplanting once they ve grown sets of true leaves that spread out to cover the full circumference of their current container. Some tips include.  Source: <a href=https://www.gtfinnovations.fr/2013/06/22/cannabis-seeds-marijuana-seeds-weed-seeds-on-the-market/>https://www.gtfinnovations.fr/2013/06/22/cannabis-seeds-marijuana-seeds-weed-seeds-on-the-market/</a>