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Friday July 21, 2023


The Science of Avocado Ripening: How It Works and What Affects It

Avacado Ripening Stages

Source – Shutterstock

Avocado ripening is a topic that holds great importance to consumers worldwide. Whether you’re a fan of guacamole or enjoy the creamy texture and rich taste of avocados, understanding the process of ripening can greatly enhance your avocado-eating experience. The fascination and curiosity surrounding avocado ripening is undeniable. Many avocado enthusiasts are intrigued by the transformation from a firm, unripe fruit to a perfectly ripe and ready-to-eat avocado. So, let’s dive into the world of avocado ripening and explore the stages and characteristics that make this process so intriguing.

Understanding Avocado Ripening

Avocado ripening refers to the natural process by which an avocado fruit undergoes physiological changes, resulting in optimal flavour, texture, and aroma. It is a crucial phase in the life cycle of avocados, as it determines their palatability and edibility. During ripening, avocados undergo several physiological changes. 

Stages of Avocado Ripening

Avocado ripening can be divided into several stages, each showcasing distinct visual and textural characteristics. Let’s take a closer look at these stages:

1. Unripe (Green)

An unripe avocado is firm to the touch and has a vibrant green colour. It often feels heavy for its size and lacks the characteristic creaminess associated with ripe avocados. When sliced, the flesh of an unripe avocado is pale and slightly bitter in taste.

2. Breaking (Green to Purple)

As avocados progress towards ripening, they undergo a stage commonly known as “breaking.” During this phase, the avocado’s skin may transition from green to a purplish hue, indicating the onset of ripening. However, the flesh remains firm and lacks the desired creamy texture.

Avacado - Breaking Stage

Source – Pexels

3. Firm-Ripe (Purple to Black)

In the firm-ripe stage, avocados are characterized by dark purple or black skin. The fruit feels slightly softer when gently pressed but still retains some firmness. The flesh becomes creamier and develops a milder, nutty flavour.

4. Soft-Ripe (Black)

At this stage, avocados are fully ripe and ready to be enjoyed at the soft-ripe stage. The skin is dark black and yields to gentle pressure. The flesh is creamy, smooth, and buttery, with a rich flavour often described as heavenly.

It’s important to note that avocados can transition quickly from the firm-ripe stage to the soft-ripe stage, so it’s crucial to keep a close eye on their ripening progress to ensure they are consumed at their peak.

Factors Affecting Avocado Ripening

A. Internal Factors

1. Role of Ethylene Gas

One of the key players in avocado ripening is ethylene gas. Ethylene is a natural plant hormone that acts as a signalling molecule, regulating various physiological processes, including fruit ripening. This gas is produced within the fruit itself, especially during the later stages of development. 

As the avocado ripens, it produces more ethylene gas, which triggers a series of biochemical changes. These changes include the breakdown of complex carbohydrates into simple sugars, softening the fruit’s flesh, and developing characteristic flavours and aromas.

2. Impact of Temperature and Humidity

Temperature and humidity also play a crucial role in avocado ripening. Avocados prefer a temperature range of 60 to 68°F (15 to 20°C) for optimal ripening. The ripening process slows down at lower temperatures, while higher temperatures can accelerate it. It’s important to note that extreme temperature fluctuations can negatively affect the quality of the fruit.

Humidity levels also affect the ripening process. High humidity levels can lead to excess moisture accumulation, which may cause avocados to spoil or develop fungal infections. On the other hand, low humidity can cause the fruit to dry out and lose its flavour and texture.

B. External Factors – Influence of Handling, Storage Conditions, and Exposure to Other Fruits:

External factors such as handling, storage conditions, and exposure to other fruits can significantly impact avocado ripening. Proper handling is essential to avoid bruising or damaging the fruit. Avocados should be gently handled and stored in a cool, dry place.

Storage conditions are also critical. Avocados should ideally be stored at room temperature until they reach the desired ripeness. Once ripe, they can be refrigerated to slow down the ripening process and extend their shelf life. However, it’s important to note that refrigeration can alter the texture of the fruit, so it’s best to consume refrigerated avocados within a few days.

Exposure to other fruits, especially those that produce high levels of ethylene gas, can accelerate avocado ripening. It’s advisable to store avocados separately from ethylene-producing fruits like bananas or apples to control the ripening rate.

Methods to Accelerate or Delay Avocado Ripening

A. Natural Methods

When it comes to accelerating avocado ripening, you can try a few natural methods. One approach is to use ethylene-producing fruits. Ethylene is a natural plant hormone that triggers the ripening process. You can speed up the ripening process by placing an avocado alongside ethylene-producing fruits like bananas or apples.

Another natural method is to use paper bags. Place the avocado in a paper bag and fold the top loosely. This creates an enclosed space that traps the natural ethylene gas produced by the avocado, aiding in ripening. The paper bag method is effective because it concentrates the ethylene gas around the fruit, promoting faster ripening.

On the other hand, you may slow down the ripening process. Store unripe avocados in a cool and dark place to do this naturally. The cool temperature helps delay the ripening process. Keeping avocados away from ethylene-producing fruits can also slow the ripening process.

B. Artificial Methods

If you’re looking for more control over avocado ripening, there are artificial methods you can consider. Ethylene inhibitors, such as 1-MCP (1-methylcyclopropene), can be used to prevent the avocado from responding to ethylene gas. These inhibitors are commonly used in commercial settings to delay ripening and prolong the shelf life of avocados.

Refrigeration is another artificial method for controlling avocado ripening. Storing avocados in the refrigerator can significantly slow down the ripening process. This is because the cooler temperature inhibits the avocado’s natural enzymes that promote ripening. However, it’s important to note that refrigeration can affect the texture of the avocado, making it firmer than desired.

When considering artificial methods, weighing the pros and cons is essential. While these methods offer control, they may impact the overall quality of the avocado. Ethylene inhibitors can sometimes alter the flavour and texture of the fruit. Refrigeration, although effective in delaying ripening, can produce a less creamy texture. Therefore, it’s crucial to consider the intended use of the avocado and choose the method that aligns with your preferences.


Understanding the methods to accelerate or delay avocado ripening is key to enjoying avocados at their best. Natural methods, such as using ethylene-producing fruits or paper bags, can speed up ripening, while refrigeration and ethylene inhibitors offer artificial control. Ripeness significantly affects avocados’ flavour, texture, and nutritional content, emphasizing the importance of consuming them at their ideal ripeness. So the next time you reach for an avocado, remember these methods and make the most of this delicious and nutritious fruit.