• It is legal for Illinois residents 21 and over to possess up to 30 grams of marijuana (roughly 1.06 ounces). Non-Illinois residents 21 and over can only possess 15 grams of marijuana (roughly half an ounce).• It is legal for registered medical marijuana patients to grow up to five plants per household that are five inches or taller. The amendment legalizes marijuana possession for adults beginning July 1, 2023. Additionally, it requires lawmakers to implement weed online a regulatory framework for the program, via separate legislation. South Dakota Gov. Kristi Noem instigated the legal fight to strike down the amendment that legalized recreational marijuana passed by voters in November. Here, Noem speaks in Des Moines, Iowa, in July 2021. What the law will implement starting January 1, 2022 or later: