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How Soil Affects the Taste of Coffee

Premium coffee is like good wine or exceptional tea. Each individual coffee cherry only thrives as well as its growing conditions allow it. The soil, the location, the climate and the cultivation methods: all of these are important prerequisites for producing top quality green coffee.

Today, I am going to talk to you about the ways that soil and other factors affect the taste of your coffee.

How soil affects the taste of coffee
The terroir can have a major influence on the taste of a cup of coffee: What is the soil like in which the coffee plants grow? How many hours of sun are there during harvest time? How much is the rainfall?
All of these factors influence the cultivation of coffee and the character that a coffee from a particular region ultimately has.
When it comes to wine, we can clearly distinguish between Riesling, Chardonnay or Pinot Noir. When it comes to growing coffee of different varieties, there are often differences not only between different countries, but also between different growing areas and regions within a country.
In addition to the soil cultivation, the harvesting method and, in particular, the subsequent processing of the coffee cherries also have a major influence on the aromas of the coffee.

How Soil affects the Taste of Coffee

The coffee belt offers the perfect climate for growing coffee beans, because coffee needs a very warm climate and a very specific environment in order to be able to grow. To produce the best possible beans, coffee trees must be grown at great heights in humid, tropical climates with dry and rainy seasons and on fertile soils.

Other factors that influence the quality and taste of the coffee are the variety of the plant, the quality of the soil and the way in which the fruits of the coffee plant are processed after they are harvested. In fact, the combination of factors is so complex that quality and taste can vary dramatically even within a single plantation.

Soil is where it all begins and like any other agricultural product the conditions need to be ideal for the coffee plant to grow to its full potential.

The ideal soil

Coffee plants need nutrient-rich soil and are most comfortable with a slightly acidic pH value between 5 and 6. Ethiopia's volcanic soils offer some of the best growing conditions in the world.

Planting large mulch grass will help maintain moisture, but should be removed when the seeds are fully germinated. The soil should always be well drained, but always remain moist.

coffee farm harvest

Fertilizer can also be added after germination. A fertilizer that is suitable for orchids can be used sparingly for the coffee plant. This creates the mineral content and a low pH value.

A rich, peat-based potting mix with excellent drainage is beneficial. Coffee plants don't like calcareous soils. So if the plant isn't thriving, some peat should be added.

A Tea Example

To help you understand better why rich-nutrient and well-maintained soil is so important to coffee, I will give you a parallel example regarding tea.

Chagusaba is a traditional Shizuoka tea cultivation method. The tea fields are surrounded by partially natural grass fields, which mainly consist of dwarf bamboo and silver grass. In autumn these grasses are cut off, dried and brought to the tea fields as a mixture.

The soil climate is improved, moisture is better retained and the natural fertilizer is regulated. A particularly desirable side effect: the tea becomes more aromatic and sweeter.

Much like the Chagusaba method, there are other methods that coffee farmers rely on to keep their soil rich in nutrients and ensure it maintains an ideal pH. This way the coffee plant has the chance to grow in its full potential and absorb all the unique elements from the soil.

These elements then translate to individually amazing coffee aromas and flavours that are unique to the region and sometimes the farm that the coffee grew in.

Soil Quality in large Coffee Plantations

For the sake of economy, commodity coffee beans  are usually grown on large plantations. However, these cannot meet all of the above-mentioned optimal growth conditions for the sensitive coffee plant.

This is why “plantation coffee” often does not achieve the first-class coffee taste that can be achieved with the best possible care in cultivation. This coffee is mostly grown in monocultures on large plantations.

coffee fruit

This means, on the one hand, that the coffee bushes are exposed to the blazing sun and, on the other hand, that the soil is leached out very quickly.

And coffee is also quite peculiar with regard to the nature of the soil: it should be loose, nutrient-rich soil if possible. Only good soil ensures a promising coffee taste, because the sensitive coffee plants get all the nutrients.

Large plantations may be economical, but they are not the best choice for coffee, the environment and social conscience.

Other Factors that affect the Taste of Coffee

Coffee is a product of nature, therefore climatic changes in the growing areas are the main reason why the green coffee from one region tastes slightly different from year to year or from cultivation to cultivation.
Let’s take a look at some other factors that affect the taste of coffee aside from soil quality:

1. Hours of sunshine

The best growing conditions for coffee plants can be found around the equator, as it is pleasantly warm there, but not too hot.

coffee bean sun dried

2. Amount of precipitation

Coffee plants grow particularly well with high humidity and regular rainfall (approx. 1,500 - 2,000 l per square meter), as the plants absorb a large part of the liquid they need through their leaves.

If there is enough water, brightly colored flowers can develop, which ensure that the coffee cherries develop well - the basis for high-quality and tasty coffee.
If it is too rainy during a harvest season, the coffee cherries will burst and the risk of phenol increases. If there is not enough rain, the harvest will be worse because the yield will decrease.

3. Location

Another important factor for the cultivation - and thus the taste - is the location of a growing area. The ideal combination of sunlight and precipitation can be found on slopes or in forest gardens, so cultivation areas are particularly common there.
The higher a coffee growing area is, the lower the average temperature there. This combination ensures that the coffee cherries grow more slowly and the cherries can develop better.

drying up coffee bean

The aromas of the coffee beans become more intense and stronger. Coffee plants that are grown at altitudes above 1000 meters are called "highland coffees".

4. Diversity of cultivated varieties & plant growth in the area

A fourth point, which differs from growing area to growing area and therefore influences the taste, is the variety of coffee varieties grown, as well as the general plant growth in the area.
For example, if coffee plants grow in mixed forests, the various trees and bushes can protect each other from pests - which makes the use of environmentally harmful fertilizers and pesticides unnecessary.
Coffee cherries ripen for almost a full year in some areas, such as the Ethiopian highlands. From planting to harvest, it takes up to ten months for the cherries to turn their original green into yellow and finally into a strong red.
Only a red and ripe coffee cherry yields aromas in green coffee. There are also varieties whose ripe cherries are yellow. Here, too, coffee cultivation is very individual from region to region.

Final Thoughts

Isn’t it surreal to think about all the different factors that have affected the aroma and taste of the coffee you have in your cup? Many farmers in the coffee belt take great pride in the way they take care of their soil and the coffee’s natural environment all the way from cultivation to harvest.

Farms like these usually produce excellent quality premium coffee. If knowing all this made you even more curious, then it’s time to try premium coffee and learn the farming history behind your cup. You’ll be surprised by how much there is to discover!

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Japanese Coffee Blog is a collection of articles related to the Japanese Coffee and Charcoal Roasted Sumiyaki coffee which is unique roasting only found in Japan. Coffee culture in Japan has evolved isolated from around the world and has much uniqueness not found in the rest of the world.

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Author: Kei Nishida

Kei Nishida

Kei Nishida is a writer, a Japanese Green Tea and Coffee enthusiast, and the founder and CEO of Japanese Green Tea Company and Japanese Coffee Company.

His popular Japanese Green Tea and Health Blog has been the go-to place for anything related to Japanese tea.

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