Understanding the
Specialty Coffee Supply Chain

From Cherry to Your Roaster: The Full Journey

Between the moment a coffee cherry is picked on a hillside in Tanzania and the moment your green coffee arrives at your roastery, it passes through many hands, multiple quality checkpoints, and a logistics chain that spans two or more continents. Understanding who touches your coffee — and what they do — is fundamental to sourcing with real traceability and making meaningful claims to your customers.

1. The Farm: Where It Starts

Most Tanzania specialty coffee is grown by smallholder farmers on plots of 0.5–2 hectares — not large estates. These farmers hand-pick ripe cherry (selectively picking only red, fully ripe fruit rather than strip-harvesting entire branches) and deliver it to a central washing station, typically within 24–48 hours of harvest to prevent fermentation at the cherry stage.

The quality of hand-picking at farm level is the first and most important quality decision in the chain. Selectively picked lots — where pickers are paid by quality rather than volume — consistently outperform strip-harvested lots on the cupping table. Premium prices paid to farmers for selective picking are one of the most effective quality interventions in the entire supply chain.

2. The Washing Station: Post-Harvest Processing

At the cooperative washing station, cherry is sorted (floating defects and unripe fruit are removed), pulped (the skin and outer fruit layer removed mechanically), fermented in water tanks for 12–72 hours (breaking down the remaining mucilage layer), washed clean, and then dried on raised beds for 10–21 days depending on weather conditions and lot thickness.

For natural-processed lots, the cherry bypasses pulping entirely and goes directly to raised beds as whole fruit, drying for 3–6 weeks. The washing station manager makes critical decisions throughout this process — fermentation time, drying bed density, turning frequency — that have a profound effect on cup quality.

3. The Dry Mill: Grading and Preparation for Export

After drying, parchment coffee (the bean still in its papery protective layer) is transported to a dry mill where it is hulled (the parchment removed), sorted by screen size to determine grade (AA, A, B, PB), density-sorted to remove light/defective beans, and electronically colour-sorted to remove remaining defects. The dry mill produces export-ready green coffee, and its technical quality and cleanliness significantly affect the uniformity and defect rate of the final lot.

4. The Exporter: Quality Verification and Logistics

In Tanzania, most specialty coffee exports are managed by licensed exporters — trading companies or farmer-owned organisations with export licences and logistics capabilities. The exporter commissions independent cupping (often by a Q-Grader), prepares export documentation (phytosanitary certificate, certificate of origin, ICO certificate), arranges bagging in 60kg jute or grain-pro bags, and books container space to the destination port.

The exporter's relationship with the washing station or cooperative is the critical link in direct trade — this is where premiums are negotiated, multi-season commitments are made, and quality feedback travels back to the farm.

5. Shipping and Import

Green coffee travels in 20ft or 40ft shipping containers, either loose-packed in bags or in consolidated groupage containers for smaller volumes. Transit from Dar es Salaam to European ports typically takes 20–35 days. Temperature and humidity during transit affect cup quality — grain-pro or hermetic bags provide better protection than plain jute for specialty lots, particularly naturals which are more sensitive to moisture variation.

At the destination country, an import agent handles customs clearance, import documentation, and delivery to the roaster's warehouse or a bonded warehouse. The importer may also conduct arrival cupping to verify that the lot has not degraded in transit.

6. You: The Roaster

By the time green coffee reaches your roastery, it has passed through farmer, washing station, dry mill, exporter, freight company, customs, and importer. Each stage adds cost and — when done well — adds quality assurance. The roaster's job is to understand this chain, verify the claims made at each stage, and make sourcing decisions that reflect the actual traceability and quality available.

The most meaningful version of "direct trade" is not eliminating all intermediaries — it's having visibility into, and confidence in, every stage of the chain. That requires documentation, relationships, and the willingness to ask hard questions of your suppliers.