
There are conflicting opinions on whether mushrooms need light to grow. Some sources claim that mushrooms require light only for the pinning process, after which they can grow with minimal light. Mushrooms grown with sufficient light are believed to grow larger and heavier, as they use light as a source of energy. However, other sources argue that mushrooms can grow in total darkness, although they may grow slower and in various directions. The amount of light required also varies, with some recommending 12 hours of light, while others suggest that even 15 minutes to an hour a day is sufficient.
| Characteristics | Values |
|---|---|
| Do mushrooms need light? | Mushrooms do not need light to grow, but light is important for the pinning process and growth direction. |
| How much light do mushrooms need? | A few hours of light per day is sufficient. Some sources suggest 15 minutes, while others recommend at least 3 hours. |
| What type of light do mushrooms need? | Daylight spectrum bulbs with 6500K or higher are recommended. |
| Can mushrooms grow in total darkness? | Yes, mushrooms can grow in total darkness, but they may grow in different directions. |
| Do mushrooms use light for direction of growth? | There are conflicting opinions. Some sources claim that mushrooms turn towards the light as a source of energy, while others state that mushrooms grown in total darkness will grow straight up, opposite gravity. |
| Do mushrooms derive energy from light? | Some sources claim that mushrooms derive energy from light, resulting in larger and healthier growth. However, others refute this, stating that there is no solid evidence. |
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What You'll Learn

Mushrooms don't need light to grow
In terms of the amount of light needed, there are varying recommendations. Some people suggest that mushrooms need very little light, with some saying that even 15 to 20 minutes a day is enough. Others recommend at least 3 hours, while some say that 8 hours a day is sufficient. It is worth noting that leaving the light on all the time may not be ideal as it could dry out the substrate. Additionally, direct sunlight may hinder the growth of mycelium cultures by raising the temperature above the optimum range.
The spectrum of light also seems to be a factor. Daylight spectrum bulbs with 6500K or higher are recommended. Natural sunlight or artificial bulbs with a high blue, green, or black spectrum can also be used. However, one person noted that they had forgotten containers of mycelium that were loaded with mushrooms, even though they had received no light.
Overall, while mushrooms don't need light to grow, light does impact the size and health of the mushrooms. As a result, providing some light during the growth process is recommended. However, the amount and spectrum of light can vary, and mushrooms will still grow in total darkness, even if they are smaller and less healthy.
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Light improves mushroom growth
Mushrooms do not require light to grow, as they do not photosynthesise. They can grow in total darkness, and some sources suggest that they do not derive energy from light. However, light improves mushroom growth. Mushrooms exposed to the proper amount and spectrum of light grow much larger and heavier than those grown in the dark or with insufficient light.
Amount of Light
The amount of light required by mushrooms is minimal. Some sources suggest that 15 minutes of light per day is sufficient, while others recommend at least 3 hours. One source mentions that they have gotten by with less than 20 minutes of light per day. Another source mentions that their mushrooms grew well with 8 hours of light per day.
Spectrum of Light
The spectrum of light is important for optimal mushroom growth. Daylight spectrum bulbs with a rating of 6500K or higher are recommended. These bulbs can be purchased at stores like Lowe's.
Direction of Growth
There is conflicting information about whether mushrooms use light to determine their direction of growth. Some sources claim that mushrooms turn towards the light because they are using it as an energy source, while others state that mushrooms grown in total darkness will still grow straight up, opposite gravity.
In conclusion, while mushrooms do not require light to grow, providing them with the proper amount and spectrum of light can improve their growth and yield healthier, larger, and heavier fruits.
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Light is needed for pinning
Light is essential for pinning, as it serves as a key environmental trigger that signals mycelium to transition from vegetative growth to reproductive growth. While mushrooms can grow in total darkness, light is necessary for proper pin formation and cap development.
During the pinning process, mushrooms require light to initiate fruiting and guide the growing direction of the fruiting body. The amount of light needed varies among mushroom species, with some requiring moderate light and others, like button mushrooms, only needing minimal light exposure. Oyster mushrooms, for example, need 10 to 14 hours of indirect or artificial light daily to produce good yields. On the other hand, Lion's Mane mushrooms are more sensitive to light, which significantly affects their fruiting bodies.
To ensure proper pin development, growers typically provide 10 to 12 hours of light daily, with a 12-hour on/off cycle. This can be achieved through indirect natural light or artificial light in the blue spectrum (5000-6500K). Maintaining consistent light cycles is crucial, and outlet timers can be used to regulate light exposure.
While light is essential for pinning, it is not the only factor. Temperature also plays a crucial role, with most mushroom species requiring a drop in temperature to initiate the pinning process. Additionally, proper air exchange is vital for successful pinning, as it helps maintain ideal CO2 levels and reduces the risk of contamination.
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Light as an energy source
Mushrooms do not require light to grow, as they do not photosynthesise. They can grow in total darkness, and some sources suggest that they grow against gravity. However, light is important for the pinning process and growth direction, and mushrooms exposed to light tend to grow larger and heavier.
Some sources claim that mushrooms turn towards the light because they are using it as an energy source. Mycelium, for example, grows faster under exposure to light, and mushrooms exposed to light grow larger and heavier, suggesting that they are using the light as energy. However, other sources claim that there is no evidence that mushrooms derive energy from light.
The amount of light required by mushrooms is minimal. Some sources suggest that 15 minutes to an hour of light per day is sufficient, while others recommend 8 hours or "a few hours" per day. Mushrooms do not need to follow a light cycle, and they can grow with natural or artificial light.
The spectrum of light may also be important for mushroom growth. Daylight spectrum bulbs with 6500K or higher are recommended for optimal growth.
In summary, while mushrooms do not require light to grow, light can impact the size and health of the mushrooms. The amount and spectrum of light can be manipulated to optimise mushroom growth.
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Amount of light needed
Mushrooms do not require light to grow, as they do not photosynthesise. They can grow in total darkness, although they may grow more slowly than those exposed to light. However, light is important for the pinning process, and mushrooms exposed to light tend to grow larger and healthier.
Some sources suggest that mushrooms only need a small amount of light to grow. One source says that 15 minutes of light per day is sufficient, while another says that 20 minutes is enough. Another source recommends at least 3 hours of light per day. However, one source claims that mushrooms will grow larger if exposed to 12 hours of light per day.
The amount of light mushrooms receive also depends on the light source. Some mushrooms are exposed to natural sunlight, while others are grown using artificial bulbs with a high blue, green, or black light spectrum. One source recommends using daylight spectrum bulbs with 6500K or higher.
The light cycle for mushrooms is not critical, and they do not need to be exposed to light for a specific number of hours per day. However, one source recommends providing mushrooms with bright light during the daylight cycle until harvest.
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Frequently asked questions
Mushrooms do not need light to grow, but they do benefit from it. Light is a source of energy for mushrooms, and they tend to grow larger and heavier when exposed to light.
There is no consensus on how much light mushrooms need. Some sources say that a few hours of light per day is sufficient, while others claim that even 15-20 minutes a day is enough.
Daylight spectrum bulbs with 6500K or higher are recommended for growing mushrooms.
Mushrooms use light as a source of energy and to signal pinning and growth direction.

























