Raised beds — African beds — are mesh tables about a metre off the ground on which coffee is dried in a thin layer.
Why they are better
Airflow from all sides, so coffee dries evenly rather than from the top down.
No ground contact, removing a contamination route.
Slower and cooler drying, which is consistently associated with better cup quality and better stability in storage.
Where they came from
East Africa, and the name reflects it. They are now standard for specialty lots across every producing region.
The cost
They occupy far more area per tonne than a patio, they need building and maintaining, and they are labour-intensive to load and turn.
For a smallholder co-operative, investment in raised beds is often the single highest-return quality intervention available — larger than variety changes.
Naturals especially
Natural processing depends on even drying more than any other method. The rise of good Ethiopian and Guji naturals tracks the arrival of raised beds almost exactly.
Brewing it
Nothing specific — it shows as cleanliness and consistency.