Do Mushrooms Need Light or Sunlight?

Do mushrooms need light or sunlight? If you've asked yourself this question, you're not alone. Mushrooms are fascinating, resilient organisms that are often misunderstood, leading to curiosity and a multitude of questions.


Belonging to the kingdom Fungi, mushrooms diverge from typical plant behavior largely due to their lack of chlorophyll, making them unable to perform photosynthesis. However, this doesn't make them any less essential for our ecosystem. Spanning thousands of species, mushrooms play a crucial role in breaking down organic matter and returning nutrients to the soil, in addition to serving as a food source for various organisms.


Despite their significant ecological role, the conditions for mushroom growth remain shrouded in mystery for many. It's a common misbelief that like most plants, mushrooms require sunlight for growth. However, the distinctive biology of fungi tells a different story. They captivate us with their uncanny ability to thrive and multiply in darkness, subtly contrasting the norms of nature.


This article aims to debunk the myths surrounding mushroom growth, specifically addressing how light, or lack thereof, affects their development. Join us as we delve deeper into the world of mushrooms and uncover the intriguing facts behind their growth.

What are mushrooms?

What exactly are mushrooms? They are not exactly members of the plant family, and they're a world apart from animal life. Mushrooms are fungi, a unique kingdom of organisms that play a crucial role in maintaining the health and vitality of the world around us.


Mushrooms are fruiting bodies of fungi: the part that we can see, touch, and often consume. More than just food, they act as decomposers of organic matter. This means they break down dead plants, animals, and microbes, recycling vital elements and nutrients back into the soil. Without these fungal foragers, our planet would be overwhelmed with waste.

Exploring the Types of Mushrooms

There's a spectacular diversity of mushrooms out there. Over 14,000 species of mushrooms are identified, and many more are believed to be waiting discovery. In this diverse crowd, mushrooms can be grouped into varieties like gilled mushrooms, such as the common white button mushroom, or Agaricus bisporus.


Another popular category is pored mushrooms, like the esteemed Boletus edulis, or the king bolete. Then there are the tooth fungi, an example being the striking Hydnellum peckii, popularly known as the bleeding tooth fungus. Puffballs, such as the Lycoperdon pyriforme or the pear-shaped puffball, are yet another addition to the intriguing mushroom family.

Mushroom Anatomy Simplified

While the anatomy of a mushroom can vary according to species, in general, mushrooms share a few common features. If you dissect a mushroom, you’ll discover three main parts:

  • The Cap: This is the topmost part of the mushroom, usually umbrella-shaped, containing the gills or pores where the spores are produced.
  • The Stem: Often known as the stalk, this supports the cap and elevates it from the growth substrate.
  • The Mycelium: Not visible to the naked eye, the mycelium refers to the extensive underground network of fungal threads responsible for nutrient absorption.

The Life Cycle of a Mushroom

The life cycle of a mushroom is as extraordinary as the organism itself. Each journey begins with a spore released from the cap of a mature mushroom. Given the right conditions, this spore will germinate and grow into a complex network of mycelium.


Over time, the mycelium expands, breaking down organic matter underground. When conditions become favourable, the mycelium produces the mushroom fruiting body- the part that we commonly recognize as a mushroom. Finally, this mushroom fruiting body will release spores, and the whole magical cycle begins anew.


Mushrooms are more than just food or organism. They are indeed the very pillars of nature, tirelessly working beneath the surface to keep life as we know it thriving.

How do Mushrooms Grow?

Understanding the various types of mushroom substrates and the ideal environmental conditions for growing mushrooms is essential for a successful yield. With the right knowledge and appropriate substrate, you can grow various species of mushrooms with ease.

Exploring Various Mushroom Substrates

Mushrooms grow on a diverse range of substrates, making them remarkably adaptable. These substrates accommodate widespread species of mushrooms:

  • Wood: Many mushrooms, such as shiitake, grow well on hardwood logs.
  • Straw: Both economical and effective, straw can be used as a primary substrate or combined with other materials.
  • Manure: Button mushrooms and some other species require manure for optimal growth.
  • Coffee Grounds: Spent coffee grounds can be an excellent substrate for mushrooms like oyster mushrooms.
  • Sawdust: Hardwood pellets and hardwood sawdust work well for several types of mushrooms.
  • Other Organic Matter: This includes materials like coco coir, vermiculite, and even whole logs.

Creating the Ideal Environment for Mushroom Growth

Cultivating mushrooms requires particular environmental conditions that should be monitored and controlled throughout the growing process:

  • Moisture: Ensure a humid environment without excessive wetness.
  • Temperature: Aim for a warm temperature, as most mushrooms thrive in this context.
  • Ventilation: Provide fresh air, but avoid excessive drafts.

Navigating the Stages of Mushroom Growth

Mushroom growth can be divided into distinct stages that determine the success and quality of your yield. These stages include:

  1. Mycelium growth: This stage involves the spread of mycelium underground as it breaks down organic matter.
  2. Pinning: At this point, the mushroom fruiting body begins to emerge and take form.
  3. Primordia growth: As the fruiting body continues to develop, identifiable mushroom structures will appear.
  4. Fruiting: The mushroom fruiting body reaches maturity and will release spores when the conditions are right.

By understanding the relationship between mushroom substrates and the different stages of their growth, you can successfully grow a variety of mushrooms, regardless of your level of experience.

Do Mushrooms Need Light or Sunlight?

While the question, Do mushrooms need light or sunlight? may seem straightforward, the answer is nuanced. In reality, mushrooms require light, but not necessarily sunlight, to regulate their growth and development.

Diverse Light Conditions for Mushroom Growth

Contrary to popular belief, mushrooms can grow without sunlight. In their quest for growth and development, mushrooms can make use of a variety of light conditions, such as:

  • Fluorescent Light: Efficient and easily accessible, it is a preferred option for indoor mushroom cultivation.
  • LED Light: With its power-saving feature, LEDs provide the necessary light to mushrooms without generating excessive heat.
  • Natural Light: Not to be confused with direct sunlight, natural light implies indirect or ambient light seeping into a room.

While these light sources influence mushroom growth positively, it's crucial to note that mushrooms don't photosynthesize like plants. The role of light in mushroom development is more of a growth regulator, not a source of nourishment.

Amount of Light: How Much is Enough?

The amount of light required for mushrooms varies depending on the species. However, most mushrooms need between 12 and 16 hours of light per day. This may change according to the type of mushroom, stage of growth, and ambient conditions.

Can Mushrooms Thrive in Darkness?

Yes, mushrooms can grow in the dark. They will, however, grow taller and appear more leggy due to the lack of light to regulate their growth. If growing mushrooms in the dark, it is crucial to ensure they receive adequate ventilation, as improper air circulation can lead to growth issues.


While light (particularly natural, fluorescent, or LED light) is beneficial for mushroom growth, it is not essential in the same way it is for plants. A balanced understanding of how light influences mushroom growth can lead to successful cultivation.

Selecting and Installing the Ideal Lighting for Your Mushroom Cultivation

One of the most critical aspects of mushroom cultivation is providing them with the right type and intensity of light. By choosing the appropriate type of lighting, positioning it correctly, and making necessary adjustments, you can ensure the optimal growth of your mushrooms.

Choosing the Right Type of Light for Your Mushrooms

There are several types of lights available for growing mushrooms, and the best option depends on your budget and the size of your growing area. Some popular lights used in mushroom cultivation include:

Fluorescent Light

Fluorescent lights are a popular choice among mushroom growers. They are widely known for their energy efficiency and low heat output, making them ideal for indoor mushroom cultivation. Fluorescent lights also ensure that your mushrooms get an adequate amount of light without the risk of overheating and drying out your mushroom crop.

LED Light

LED lights are quickly becoming a go-to source of lighting in mushroom cultivation due to their long lifespan and superior energy efficiency. They emit an intensely strong light without much heat, which is highly beneficial in avoiding any potential heat damage to your mushrooms. Another advantage is the flexibility they offer, as they come in a wide range of colors and intensities, allowing you to simulate different spectral compositions beneficial for specific mushroom species.

Natural Light

Natural light can also facilitate the growth of your mushrooms, especially for those mushroom cultivators who grow mushrooms outside or in greenhouses. However, mushrooms should never be exposed to direct sunlight, as it can quickly dry them out and impair their growth. Ambient or diffused natural light is perfect for mushroom growth, as it helps regulate their development in natural environmental conditions.

Positioning Your Lights for Even Coverage

Ensuring that your mushrooms receive even light coverage is crucial. There are several methods you can use to position your lights effectively:

  • Hanging the Lights from the Ceiling: This allows for easy adjustments and ensures uniform light distribution.
  • Placing the Lights on Shelves: Ideal for smaller growing spaces, this method makes for a compact setup.
  • Using Grow Stands: Grow stands can hold lights at the desired height and be easily moved around the growing area.

Adjusting the Light Intensity for Optimal Growth

The ideal light intensity for your mushrooms varies depending on the species and growth stage. You can:

  • Use a Light Meter: This device helps measure the light intensity at different locations within the growing space.
  • Adjust the Height of Your Lights: Bringing the lights closer to or further from the mushrooms can increase or decrease the light intensity as needed.

By making informed choices about the type of lights you use, positioning them correctly, and adjusting the light intensity, you can create a conducive environment for the thriving growth of your mushrooms.

Wrapping Up

In conclusion, mushrooms present an intriguing exception in the world of organisms often associated with growth in light. They neither require sunlight nor engage in photosynthesis for growth. Instead, mushrooms exhibit an exceptional ability to prosper in various lighting conditions, such as fluorescent, LED, or ambient natural light.


While it's true that different species of mushrooms have various light needs, most adjust well to a schedule of 12-16 hours of light per day. Interestingly, dark-grown mushrooms exhibit distinct growth patterns, often growing taller and leggier than their light-grown counterparts. However, if you prefer to grow mushrooms in the dark, a crucial factor to remember is to ensure adequate ventilation.


The primary purpose of light in the life cycle of mushrooms is to regulate their growth and development, especially during the fruiting phase. So, whether you're a novice mushroom enthusiast or an experienced cultivator, remember, providing the right amount and type of light can greatly enhance the success of your mushroom cultivation.


In light of these fascinating insights, we'd love to hear about your unique experiences growing mushrooms. Feel free to share your mushroom-growing tales or delve deeper into the mushroom-light relation.

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