Running a full pack of ten CBD seeds and keeping the best plant is how most stable home lines get started. Expect real differences in height, smell and finishing week between siblings, and do not assume the biggest plant has the best cannabinoid profile. A basic pheno selection template with the traits worth scoring is available on https://calmcbdseeds.com, and it stops you choosing on looks alone. Taking a cutting from each candidate before flower is the step people forget.