How Fast Do Mushrooms Grow?

Mushrooms have been interesting to people for hundreds of years because of their different forms, colors, & flavors. However, something that often makes us wonder: How fast do mushrooms grow?

Understanding the growth rate of mushrooms is not only fascinating but also essential for both commercial growers & home enthusiasts.

In this article📃, we’ll explore the various factors influencing mushroom growth, the life cycle of mushrooms, and the techniques used to optimize their development. So, how fast do mushrooms actually grow? Let’s find out.

How fast do mushrooms grow?


Mushrooms possess an inherent mystique, emerging seemingly overnight in forests or popping up unexpectedly in our gardens.

This rapid growth has sparked the imagination of many, leading us to question the precise speed at which these fungal wonders manifest.

While the exact growth rate depends on several variables, such as mushroom species and environmental conditions, understanding the underlying factors can shed light on this captivating process.

The Life Cycle of Mushroom

Mushrooms go through a distinct growth cycle comprising several stages, each with its own unique characteristics & requirements.

1. Spore Germination

The mushroom growth process begins with the germination of spores. Spores are tiny reproductive cells released by mature mushrooms.

When conditions are favorable, spores land on a suitable substrate and germinate, forming fine strands of mycelium.

2. Mycelium Formation

As the mycelium expands, it colonizes the substrate, consuming nutrients and dissolving organic debris. This phase is crucial for establishing a strong foundation for mushroom growth.

3. Primordia Development

Under optimal conditions of temperature, humidity, and nutrition, the mycelium develops small, pin-like structures called primordia. These primordia serve as the precursor to mushroom formation.

4. Mushroom Fruiting

As the primordia continue to develop, they mature into fully-grown mushrooms. The fruiting stage is characterized by rapid growth, with mushrooms increasing in size and developing distinct caps and stems.

Factors Affecting Mushroom Growth

Several factors influence the speed at which mushrooms grow. Understanding and optimizing these factors can help accelerate their growth process.

1. Temperature and Humidity

Mushrooms thrive in specific temperature🌡️ & humidity ranges. The ideal temperature range for mushrooms is between 55°F to 75°F (13°C to 24°C) with a humidity of 80 to 90%. However, different mushroom types have different temperature preferences.

2. Light

While mushrooms don’t require light for growth, it plays a crucial role in their development. Light, especially in the form of blue or indirect sunlight, helps in initiating and directing the growth of mushrooms.

3. Substrate and Nutrients

The choice of substrate and nutrient content significantly impacts mushroom growth. Different mushroom species have specific substrate preferences, such as wood chips, straw, or sawdust. Nutrient-rich substrates promote faster growth and higher yields.

4. Air Quality

Mushrooms require adequate fresh air exchange to thrive. Proper ventilation helps maintain optimum carbon dioxide and oxygen levels, supporting healthy mycelial growth and overall mushroom development.

Common Mushroom Varieties and Their Growth Rates

Different mushroom varieties exhibit varying growth rates. Let’s explore some popular mushrooms and their typical growth timelines:

1. Button Mushrooms

Button mushrooms (Agaricus bisporus) are among the fastest-growing mushrooms, taking approximately 15 to 20 days from spawn to harvest.

2. Shiitake Mushrooms

Shiitake mushrooms (Lentinula edodes) are highly valued for their culinary and medicinal properties. They typically take around 3 to 4 weeks from spawn to harvest.

3. Oyster Mushrooms

Oyster mushrooms (Pleurotus spp.) are known for having a mild taste & growing quickly. They can be harvested in about 2 to 3 weeks after being planted.

4. Portobello Mushrooms

Portobello mushrooms (Agaricus bisporus) are mature button mushrooms left to grow larger. They require around 10 to 12 days from spawn to harvest.

Cultivation Techniques to Speed Up Mushroom Growth

To optimize mushroom growth speed, growers employ various cultivation techniques. Here are some effective methods:

1. Optimal Temperature and Humidity Control

Maintaining the ideal temperature and humidity throughout the growth cycle is crucial. Using things like heaters, coolers, & humidifiers to control the surroundings can help make the conditions you want.

2. Nutrient-Rich Substrate

Choosing a substrate with the right nutrient composition is essential. Combining suitable ingredients like straw, wood chips, or agricultural byproducts provides the mycelium with an abundance of nutrients for rapid growth.

3. Proper Lighting

Although mushrooms don’t require direct sunlight, providing indirect light or exposure to blue light can stimulate their growth & development.

4. Adequate Air Exchange

Ensuring proper air circulation and fresh air exchange within the growing environment is vital. This can be achieved through the use of ventilation systems and fans.

Benefits of Fast Mushroom Growth

Fast mushroom growth offers numerous advantages for both commercial growers and enthusiasts.

For commercial operations, shorter growth cycles translate into higher yields and quicker turnaround times, ultimately increasing profitability.

Home growers benefit from faster harvests, allowing for a more continuous supply of fresh mushrooms.

Moreover, accelerated growth can reduce the risk of contamination and pests, resulting in healthier and more robust fruiting bodies.

Harvesting and Storage of Mushrooms

When mushrooms reach their desired size, they are ready for harvest. It’s important to harvest them carefully to avoid damaging the mycelium or neighboring mushrooms.

Freshly picked mushrooms can be kept for a few days in a cool & dark place or in the fridge.

Also Read: How Do You Say Mushroom in Spanish?

Mushroom Growth Timelines

Each stage of mushroom growth has a specific timeline. Here’s an overview of the growth timeline and expected yields per harvest:

Timeframe for Different Stages of Growth

  • Spore germination: 1 to 2 weeks
  • Mycelium formation: 2 to 3 weeks
  • Primordia development: 1 to 2 weeks
  • Mushroom fruiting: 1 to 2 weeks

Expected Yield per Harvest

The yield per harvest depends on various factors, such as mushroom variety, growing conditions, and cultivation techniques.

On average, according to growers, 0.5 to 1 pound of mushrooms should be produced for every pound of substrate.

Benefits of Growing Mushrooms

Growing mushrooms at home or on a larger scale offers several benefits beyond the joy of watching them grow. Let’s explore some of these benefits:

1. Culinary Delights

Freshly picked mushrooms elevate the culinary experience by adding a mouthwatering flavor & texture to a variety of recipes.

2. Nutritional Value

Mushrooms are a healthy food, low in fat & calories and high in minerals, vitamins, and antioxidants. Incorporating mushrooms into your diet can contribute to a healthy lifestyle.

3. Medicinal Properties

Some types of mushrooms have therapeutic qualities and have long been utilized in traditional medicine. Examples include reishi, lion’s mane, & cordyceps, known for their potential health benefits.

Also Read: How Do Mushrooms Get Their Food?

Fascinating Facts about Mushroom Growth

Apart from their growth speed, mushrooms hold many other fascinating attributes.

Did you know that the world’s largest living organism is a honey fungus (Armillaria ostoyae) that spans over 2,400 acres in Oregon, USA?

In addition, mushrooms may flourish in almost every environment, from deserts to freezing tundra of the Arctic.

Some mushrooms have special qualities, such as the jack-o-lantern mushroom’s (Omphalotus olearius) bioluminescent mycelium, which shines at night.


Mushrooms🍄 have a fascinating growth cycle, influenced by factors such as temperature, humidity, light, substrate, & air quality.

By understanding and optimizing these factors, growers can speed up mushroom growth.

Mushrooms are still a favorite among foodies & people who care about their health because they come in many different tastes😋 and textures and might be good for them.

Also Read: Does Mellow Mushroom Deliver?


How fast do mushrooms grow?

The growth rate of mushrooms can vary depending on the species, but generally, they can appear within a few days to a couple of weeks.

What factors affect the speed of mushroom growth?

Factors such as temperature, humidity, light, substrate quality, and mushroom species can influence the speed of mushroom growth.

Are all mushrooms fast growers?

No, not all mushrooms have the same growth rate. Some species, like the common white button mushroom (Agaricus bisporus), grow relatively quickly, while others may take longer.

Can mushroom growth be accelerated?

While you cannot dramatically speed up mushroom growth, you can optimize growing conditions to promote faster growth. Maintaining ideal temperature, and humidity, and providing proper nutrients can help.

What is the fastest-growing mushroom species?

The oyster mushroom (Pleurotus ostreatus) is known for its relatively fast growth rate, often appearing within 7-14 days under optimal conditions.

Can mushroom growth be slow?

Yes, certain factors such as suboptimal growing conditions, poor substrate quality, or the nature of the mushroom species itself can result in slower growth.

How long does it take for mushrooms to reach maturity?

The time for mushrooms to reach maturity varies depending on the species. Some mushrooms can be harvested within a few days, while others may take several weeks.

Are there mushrooms that grow overnight?

Yes, some mushrooms, known as “ephemeral” mushrooms, have a rapid growth cycle and can seemingly appear overnight, often in response to favorable environmental conditions.

Can mushrooms grow in cold temperatures?

Some mushroom species are adapted to colder climates and can grow in low temperatures, although their growth may be slower compared to warmer conditions.

What is the impact of temperature on mushroom growth?

Temperature plays a crucial role in mushroom growth. Each mushroom species has an optimal temperature range for growth, and deviations from this range can significantly affect their development.

Does the size of the mushroom affect its growth speed?

Generally, the size of the mushroom does not directly affect its growth speed. However, mushrooms may need more time to reach maturity and develop larger fruiting bodies.

Can mushrooms grow in the dark?

Most mushrooms don’t require light for growth and can thrive in darkness. In fact, some species prefer low light or complete darkness during their growth phase.

Can you speed up mushroom growth by providing more water?

While mushrooms require adequate moisture, providing excess water will not accelerate their growth. Overwatering can actually lead to issues like rot or contamination.

Can mushrooms grow indoors?

Yes, many mushroom species can be cultivated indoors using appropriate growing techniques, making it possible to grow mushrooms year-round regardless of outdoor conditions.

How long can mushrooms continue to grow?

Mushroom growth usually continues until the nutrients in the substrate are depleted or the environmental conditions become unfavorable. The duration can vary based on species and growing conditions.

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