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CBN is another of hemp's minor cannabinoids, and it has a particularly interesting origin: it forms as the plant ages. This guide explains what CBN is, where it comes from and how it relates to CBD. It is information only, and we make no medical or health claims.
What is CBN?
CBN stands for cannabinol, a cannabinoid found in the hemp plant. Unlike CBD, which the plant produces in abundance, CBN is largely a product of ageing. It forms gradually as THC degrades over time through exposure to oxygen, heat and light. That is why older, more aged plant material tends to contain more CBN than fresh flower.
How is CBN formed?
CBN is created by the natural breakdown of THC. As cannabis or hemp material ages and is exposed to air and light, THC slowly converts into CBN. This makes CBN quite different from cannabinoids that the plant actively produces while growing, such as CBD. In practical terms, very fresh flower usually has little CBN, while older material has more.
CBN vs CBD
CBN and CBD are distinct cannabinoids with different origins. CBD is produced in large amounts by CBD-rich hemp as it grows, while CBN appears mainly through ageing and degradation. In finished CBD flower, CBD is the dominant cannabinoid and CBN is typically a minor one. For the broader cannabinoid picture, see our guide, CBD vs THC, and our explainer on CBG.
Does CBN appear in CBD flower?
It can, usually in small amounts, as part of the full range of compounds in whole-plant products. This is part of why storage matters: as flower ages, its cannabinoid profile can slowly shift. To keep flower fresh and stable, see our guides on storage and whether CBD flower expires.
Is CBN legal in the UK?
Cannabinoids like CBN sit within the same complex legal picture as other hemp-derived compounds, and hemp flower itself sits in a legal grey area. CBD is legal, but plant-derived products are treated differently. See our guide, Is CBD Flower Legal in the UK? Information only, not legal advice.
Frequently asked questions
Is CBN the same as CBD?
No. They are different cannabinoids. CBD is produced as the plant grows, while CBN forms mainly as THC degrades with age.
Does CBN get you high?
We make no claims about CBN's effects. It is a distinct minor cannabinoid, and research into it is ongoing.
Why does old flower have more CBN?
Because CBN forms from the breakdown of THC over time, ageing and exposure to air and light increase it.
The bottom line
CBN is cannabinol, a minor cannabinoid that forms as hemp ages and THC degrades. Fresh flower has little; older material has more. Like other cannabinoids, it sits within a nuanced legal picture, and research continues.
Written and reviewed by the Easygreen CBD team, UK hemp specialists. Reviewed and updated: July 2026. General information only. We make no medical or health claims about CBN or any cannabinoid, and research is ongoing.
