What Single-Origin Kava Is
Single-origin kava comes from one specific cultivar, often traceable to a particular farm, region, or country. Because it isn't mixed with other cultivars, single-origin kava tends to showcase that cultivar's specific chemotype and character more distinctly, similar to how a single-origin coffee or chocolate highlights the character of one specific source rather than a consistent house blend. Vendors selling single-origin kava can usually tell you exactly which cultivar and often which region it's from.
What Blended Kava Is
Blended kava mixes two or more cultivars, or sometimes multiple batches of the same cultivar, together. Blending is often done to achieve a more consistent product batch to batch, to balance strength and taste, or simply because it's more cost-effective at scale than sourcing a single cultivar exclusively. A well-made blend isn't a lesser product, it's a different design choice, similar to how many wines and whiskies are intentionally blended rather than single-source.
Which Should You Choose?
If you want to learn what a specific cultivar actually tastes and feels like, or you're curious about a particular region's kava, single-origin is the better way to explore that. If you want a reliably consistent everyday product and don't mind not knowing the exact cultivar mix, a good blend can serve you just as well, often at a lower cost. Many kava drinkers end up trying both over time.
Whichever you choose, cultivar quality still matters more than whether it's single-origin or blended. A blend of noble cultivars is a better choice than a single-origin tudei product. See Noble Kava vs Tudei Kava and How to Choose Quality Kava.