To prevent it from spreading, hand pull or dig it out of the soil. This means that if you are using dill weed in place of the seeds, it is best to add them towards the end of the cooking time rather than at the beginning. Gently water your lawn, enough to keep your seeds moist but not soaked. Source:
https://www.lapatentedecorso.com/excessive-tide-begins-to-sell-hashish-seeds-in-usa/