Extended fermentation

Extended fermentation

Extended fermentation is a high-risk processing method that pushes the boundaries of flavour development. Careful control of temperature, humidity, and oxygen slows fermentation, but the longer the beans ferment, the greater the risk of unwanted flavours. When executed successfully, this method produces distinctive coffees with bold, layered profiles that stand apart from traditional processing

  • Sitio Maranhão - Experimental Brazil
    Brazil

    Sitio Maranhão - Experimental Brazil

    Sitio Maranhão - Experimental Brazil

    Cupping Score
    86.25
    Processing method
    Experimental
    Varietal
    Yellow Catuai
    Main flavour notes
    Hazelnut | Brown Sugar | Green Apple
    In Stock
    +25kg left
  • Andres Bazos coffee processing
    Peru

    Andres Bazos - Red Caturra - ⚠️ Parchment Issue

    Andres Bazos - Red Caturra - ⚠️ Parchment Issue

    Cupping Score
    83.5
    Processing method
    Washed
    Varietal
    Red Caturra
    Main flavour notes
    Orange Citrus | Caramel | Milk Chocolate
    Out of Stock
  • Auro 72h Yeast Fermentation Acaiá Peaberry
    Brazil

    Auro 72h Yeast Fermentation Acaiá Peaberry

    Auro 72h Yeast Fermentation Acaiá Peaberry

    Cupping Score
    89.5
    Processing method
    Experimental
    Varietal
    Acaiá Peaberry
    Main flavour notes
    Caramel Shards | Yellow Tomato | Physalis | Tartaric | Syrupy
    Out of Stock
  • Sucalfru 72h Yeast Fermentation
    Brazil

    Sucalfru 72h Yeast Fermentation

    Sucalfru 72h Yeast Fermentation

    Cupping Score
    88.0
    Processing method
    Experimental
    Varietal
    Arara Peaberry
    Main flavour notes
    Tamarind | Starfruit | Watermelon | Juicy
    Out of Stock
  • Rancho Morelia 2025
    Mexico

    Rancho Morelia 2025

    Rancho Morelia 2025

    Cupping Score
    85.0
    Processing method
    Experimental
    Varietal
    Bourbon , Typica , Catimor
    Main flavour notes
    Maple Syrup | Cocoa | Orange | Bergamot
    In Stock
    +50kg left

Dein Guide zu Extended fermentation

  • What is extended fermentation coffee processing?

    Extended fermentation is a processing method that prolongs the natural fermentation stage in coffee production, allowing for deeper, more complex flavours to develop. Unlike standard washed processing, where fermentation lasts around a day, this method extends the process for significantly longer.

    Producers carefully control factors like temperature, humidity, and oxygen levels to slow fermentation and guide flavour development. While this approach carries risks—such as over-fermentation or unintended flavour changes—when done successfully, it can enhance acidity, sweetness, and overall complexity. After fermentation, the coffee is washed and dried, following the typical steps of washed processing.

  • What are different types of extended fermentation?

    Extended fermentation can take place in different forms, each with its own impact on flavour. For example:

    • Anaerobic fermentation takes place in a sealed, oxygen-free environment, slowing fermentation and producing unique, often fruity or wine-like characteristics.
    • Cold fermentation involves keeping the coffee at lower temperatures—either in refrigeration or through nighttime processing—which slows microbial activity and enhances intricate, layered flavours.
    • Partial drying means drying the coffee cherries partway through fermentation before completing the process. This can intensify complexity and add depth to the cup profile.

  • What are the challenges of extended fermentation?

    Precision is key in extended fermentation, as small changes can dramatically affect the final flavour. The main risks include:

    • Over-fermentation, which can introduce unpleasant vinegary or overly sour notes.
    • Alcoholic flavours that may overpower the coffee’s natural characteristics if fermentation goes too far.
    • Inconsistency, since environmental factors like temperature and humidity can make it difficult to replicate results.

    Because of these risks, producers must closely monitor the process to maintain control. The longer the beans ferment, the higher the risk of unwanted flavours, making extended fermentation one of the most technically demanding processing methods.

Deine Fragen, beantwortet

Was ist das Green Coffee Collective?

Wir sind eine Gemeinschaft aus Kaffeebauern und Beschaffungsexperten, die zusammen daran arbeiten, den Zugang zu Rohkaffee so einfach wie möglich zu machen – egal ob du zu Hause als Hobby röstest oder als Profi hunderte Tonnen im Jahr verarbeitest. Unsere Plattform macht den Einkauf von Rohkaffee so unkompliziert wie jeden anderen Onlinekauf. Kein Aufwand, nur großartiger Kaffee – direkt für dich verfügbar.

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It’s super easy! Just head to our coffee pages and use the search filters to narrow down what you’re after. Whether it’s origin, process, or variety, the filters make it simple to find exactly what you want. You can also check out the main coffee categories through the top menu on our site. Give it a go—it’s straightforward, and if you need help, we’re always here!

Are your coffees ethically and sustainably sourced?

Absolutely! We source all our coffees either directly from producers or through trusted sourcing partners who are just as committed to ethical practices as we are. We take the time to ensure the people behind the coffee are treated fairly. If you want to learn more, you can dive into our values.

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If your order hasn’t shipped yet, just drop us an email at orders@greencoffeecollective.com with your order ID, and we’ll take care of it. If it’s already on its way, we can still help. We’ll just need to arrange a collection. Either way, email us and we’ll sort it out for you. You’re in control!

What sizes or quantities can I order?

We offer coffee starting from as little as 0.5kg (1 lb) all the way up to full sacks. If you’re looking for larger quantities than what’s listed on our site, just get in touch! We’d be happy to help you organise and place a custom order. We're here to make sure you get exactly what you need.

Unterstützt ihr beim Aufbau von Direct-Trade-Beziehungen mit Produzenten?

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Do you offer samples or trial batches before committing to larger orders?

Yes, we offer samples for most of our coffees. If you need a larger sample than what’s typically available, we recommend trying one of the smaller quantity options listed on our site. That way, you can test the coffee before committing to a larger order.

What is your process for ensuring consistency between lots or harvests?

We work closely with our sourcing partners to make sure we’re always offering top-quality coffee. Most of the partners you’ll find on our site have years of experience in their regions, and they use that expertise to access the best coffees available each season. Their deep relationships with producers help maintain consistency in both quality and supply.

What is your minimum order quantity (MOQ) for large-scale or long-term contracts?

For larger-scale or long-term contracts, you can start with as little as a single bag. We’re also working on tools to help you access harvests and reserve coffees before they even leave the country. While it’s not fully ready yet, we’re always here to help roasters of any size connect with the producers they want to work with.