Top-Rated CBD Flower and Hemp Pre-Rolls of 2021 By Storyhub When the 2018 farm bill passed and legalized industrial hemp at a federal level, hundreds of CBD flower companies burst onto the scene offering a wide variety of smokable hemp products. But as CBD genetics improve and growers produce better and better harvests, it can be difficult for consumers to know what brand and which CBD strain to buy. So to help you choose the best possible strain, we have rounded up our top five CBD hemp flower strains of 2021. These are the most powerful, enjoyable and aromatic buds that produce optimal effects.