A bitter yellowish powder found on glandular hairs beneath the scales of the flowers of the female hop plant.
- It is very important that the hop doesn't lose lupulin otherwise the hop is no longer bitter.
- Essential oils and lupulin resins are concentrated in the lupulin glands, found at the base of the leaves, close to the central stem.
- They contain all the vegetative and lupulin material of raw leaf hops and can be used as a full replacement for leaf hops in the brewing process.
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