Proponents of several proposed ballot initiatives will begin the final stage of their petitioning efforts Wednesday to secure spots on the November 2018 ballot. The proposed ballot questions include a gradual minimum wage increase, paid family leave for working individuals and balanced nurse-to-patient ratios in Massachusetts hospitals.

Groups seeking to legalize the recreational use of marijuana in Massachusetts filed petition signatures Wednesday to place certified questions on the upcoming 2016 election ballot. The Campaign to Regulate...