Answer: State law allows adults aged 21 years and older to grow up to six marijuana plants at a time for personal use. An additional eleven states have legalized medical marijuana and decriminalized recreational marijuana use.It is unlawful for any person to conduct, engage in or allow to be conducted or engaged in, cannabis cultivation in the unincorporated portion of the County of. Today, cannabis is legal in California for both medicinal and adult (recreational) use. The cannabis industry is strictly regulated. In the United States, the non-medical use of cannabis is legalized in 24 states and decriminalized in 7 states, as of November 2023. Retail sales of marijuana for recreational use are now legal in California. Take California for example: first in the nation to legalize the medical use of the drug in 1996, the state would go on to legalize recreational use in 2016.