A company called “Strain Genie” claims to be able to analyze your DNA and tell you how cannabis will affect you. You may get information on how well you metabolize CBD as well as suggestions as to which terpenes you might most benefit from.
If you are making your own CBD oil you can tailor your blends of terpenes to include terpenes that are activating for morning use and terpenes that are sedating for evening use.
All cannabis (including marijuana and hemp) is now considered botanically to be Cannabis sativa. Differences between strains are largely due to different combinations of cannabinoids and terpenes (and possibly other substances).
Fields of Hemp is a small grower of CBD hemp flower. Tweedle Farms (a big vendor) has sold some of their flower in the past. A Reddit contributor recently made a video reviewing all of their offerings.
Seth and Eric Crawford formed Oregon CBD Seeds to develop CBD-rich varieties of hemp. They bred their signature male “Early Resin Berry” (ERB) with a number of varieties of high CBD cannabis to get varieties such as Special Sauce, Lifter, Hawaiian Haze, Elektra, Suver Haze, and Sour Space Candy