Growing Mushrooms in Core Keeper: Easy Guide

Growing Mushrooms in Core Keeper: Easy Guide

Are you looking for a new and exciting way to put your Core Keeper to use? Why not explore the world of mushroom cultivation? Not only is it an eco-friendly and sustainable way to produce food, but it can also be a lot of fun. In this easy guide, we’ll provide you with all the information you need to start growing mushrooms in your very own underground haven.

Key Takeaways

Understanding Mushroom Basics

Before embarking on the journey of mushroom cultivation, it’s essential to familiarize yourself with the basics of fungi. There are numerous mushroom varieties, each with unique characteristics and growth preferences.

  • Mushroom Cultivation: Cultivating mushrooms is the process of reproducing and growing them for consumption or commercial use. It involves creating the ideal environment for spores to germinate, resulting in the development of mycelium and, eventually, the fruiting body or mushroom.
  • Mushroom Varieties: There are many popular mushroom varieties, including button, shiitake, oyster, and portobello mushrooms. Each variety has specific temperature, humidity, and nutrient requirements.
  • Mushroom Life Cycle: The mushroom life cycle consists of four stages: spore, mycelium, primordia, and fruiting body. Understanding these stages is key to successful mushroom cultivation.
  • Mushroom Nutrition: Mushrooms are an excellent source of nutrients and vitamins, including protein, fiber, and B vitamins. Consuming mushrooms has been linked to numerous health benefits, including improved immune system function and decreased inflammation.

Mushroom Cultivation Techniques

There are several methods of mushroom cultivation, including:

Cultivation Technique



Using spores or mycelia to inoculate a substrate, which then colonizes with mycelium and produces fruiting bodies

Spawn Run

Using prepared spawn to inoculate a substrate, allowing it to spread through the growing medium before initiating fruiting


Covering a previously colonized substrate with a casing layer to promote fruiting in the now-fertile soil

Each technique has its advantages and disadvantages, so it’s essential to research and choose the method that best fits your mushroom and cultivation goals.

With a firm understanding of mushroom basics and cultivation techniques, you are now ready to dive into the world of mushroom growing. Next, we’ll explore how to set up the ideal growing environment for your Core Keeper mushroom farm.

Setting up the Ideal Growing Environment

Creating the perfect environment is essential for your mushroom farm to thrive. Here’s what you need to know about the ideal growing environment and mushroom growing conditions in your Core Keeper underground haven:

Environmental Factor

Ideal Range


60-70°F (15-21°C)




Minimal natural light, low-intensity artificial light

Keep the temperature within the ideal range by using a thermostat to regulate the temperature. You can also use a humidifier to maintain the optimal humidity level. It’s crucial to have minimal natural light and low-intensity artificial light to prevent the growth of unwanted bacteria and fungus.

By ensuring a stable and optimal environment, you’ll significantly increase the chances of a healthy mushroom crop. Remember, the better the conditions, the better your mushrooms will grow!

Choosing the Right Mushroom Species

When it comes to growing mushrooms in Core Keeper, selecting the right mushroom species is key to a successful harvest. Not all mushrooms are created equal, and some species may not thrive in the unique environment of your underground haven. Therefore, it’s important to choose the ones best suited for your mushroom farm.

Here are some of the most popular mushroom species for Core Keeper:

Mushroom Species

Growing Difficulty

Suitable Substrates



Manure, straw, sawdust, compost



Oak logs, sawdust, grain, straw



Straw, sawdust, wood chips, coffee grounds



Oak logs, sawdust, grain

As you can see, different mushroom species have varying levels of difficulty and substrate requirements. If you’re new to mushroom farming, starting with a species like the button mushroom may be the best option, as it’s easy to grow and requires few ingredients. Alternatively, if you’re up for a challenge, the maitake mushroom is more difficult to cultivate but offers a unique flavor and texture.

Ultimately, the choice of mushroom species depends on your personal preferences and skill level. With patience and the right techniques, you can successfully grow a wide range of mushrooms in your Core Keeper mushroom farm.

Preparing the Mushroom Spawn

Properly preparing mushroom spawn is crucial for successful mushroom growth in your Core Keeper environment. Mushroom spawn is essentially the “seeds” for your mushrooms, containing the mycelium that will eventually form the fruiting bodies.

Selecting the Right Mushroom Spawn

When selecting mushroom spawn, it’s important to choose a high-quality, reputable supplier. Look for companies that offer spawn specific to your desired mushroom species and growing conditions. Oysters, shiitakes, and portobellos are some common options, but there are many others to choose from.

Sterilizing the Mushroom Spawn

Before using the mushroom spawn, it must be sterilized to eliminate any unwanted pathogens or bacteria. There are several methods for sterilizing mushroom spawn, including pressure cooking, boiling, or using chemical sterilizers. Follow the supplier’s instructions carefully and ensure your equipment is clean and sterile before proceeding.

Preparing the Mushroom Spawn for Planting

Once the mushroom spawn has been sterilized, it’s time to prepare it for planting. This typically involves mixing the spawn with a substrate material, such as sawdust, straw, or coffee grounds. The substrate serves as the nutrients for the mycelium to grow and develop.

“Remember to keep your hands and equipment clean while handling mushroom spawn to avoid contamination.”

Generally, the ideal spawn-to-substrate ratio should be around 1:5 to 1:10, depending on the mushroom species you are growing. Mix thoroughly to ensure even distribution and transfer the spawn-substrate mixture to your mushroom growing beds.

With properly prepared mushroom spawn, you’re well on your way to bountiful mushroom yields in your Core Keeper environment.

Creating a Mushroom Growing Substrate

When it comes to growing mushrooms in Core Keeper, choosing the right substrate is essential for optimal growth. The substrate is the material that the mushrooms will grow on and is typically made from organic matter, such as straw, sawdust, or even coffee grounds.

There are many different options for mushroom substrates, and each has its own unique benefits and drawbacks. For example, straw is an excellent substrate choice because it’s affordable and easy to find. However, straw can be prone to contamination and may require more frequent sterilization.

Common Mushroom Substrates

Substrate Material




Affordable, widely available

Proneness to contamination, may require frequent sterilization


High yield potential, good for large-scale production

Requires specialized equipment for sterilization, can be expensive

Coffee grounds

Readily available, excellent for urban farming

Low yield potential, requires frequent turning


Absorbent, holds moisture well

May require additives for optimal growth

Creating a mushroom growing substrate involves combining organic matter with other additives, such as gypsum or lime, to create the ideal growing medium for your fungi. The exact recipe will depend on the mushroom species you’ve chosen and your specific growing conditions.

Once you’ve selected your substrate material and additives, it’s time to sterilize the mixture to kill off any unwanted bacteria or fungi. This is typically done by using heat to reach temperatures between 140°F and 160°F for several hours. Once the substrate has been sterilized, it’s ready to receive your mushroom spawn and begin the growing process.

By understanding the different options for mushroom substrates and learning how to create the perfect growing medium, you’ll be well on your way to a successful mushroom farm in Core Keeper.

Planting and Caring for Mushroom Beds

Now that you have prepared your mushroom spawn and growing substrate, it’s time to plant your mushroom beds. Follow these easy steps to ensure a successful harvest:

  1. Prepare the bed: Choose a location in your Core Keeper environment that provides appropriate lighting and temperature conditions for your selected mushroom species. Clear the area and sterilize the growing surface with a diluted bleach solution.
  2. Plant the spawn: Spread the mushroom spawn over the sterilized growing surface and cover it with a thin layer of your prepared substrate.
  3. Maintain moisture: Mushrooms require consistent moisture levels to thrive. Water your mushroom bed regularly with a spray bottle, keeping the substrate moist but not soaking.
  4. Watch for growth: Within a few days, you should begin to see the first signs of mushroom growth. Continue to monitor the bed’s moisture levels and adjust as needed.
  5. Harvest: Once your mushrooms have reached maturity, carefully harvest them by twisting or cutting the stems at the base.

Caring for your mushroom bed is also important to ensure a successful yield. Keep the bed clean and free of debris, and maintain consistent temperature and humidity levels. With proper care, you can continue to harvest mushrooms from your Core Keeper bed for multiple seasons.

Harvesting and Preserving Your Mushroom Yield

Congratulations on successfully growing your Core Keeper mushrooms! Now it’s time to reap the rewards of your hard work by harvesting and preserving your mushroom yield. Follow these best practices to ensure that your mushrooms stay fresh and delicious.

Harvesting Your Mushrooms

When your mushrooms have reached maturity, it’s time to harvest them. To avoid damaging the surrounding area, gently twist and pull the mushrooms from the substrate. Be sure to harvest the mushrooms before their caps begin to flatten out.

Harvesting should be done daily to prevent over-ripening and spore dropping. Also, avoid harvesting more than half of the mushroom bed at any one time to ensure consistent yields over a longer period of time.

Preserving Your Mushroom Yield

Properly preserving your mushroom yield will help ensure that your mushrooms stay fresh and delicious for longer. One popular method is to dehydrate the mushrooms using a food dehydrator. Simply slice the mushrooms thinly and then dry them at 135°F until they are crisp.

If you prefer to freeze your mushrooms, slice them and then place them in a single layer on a tray in the freezer. Once frozen, transfer them to a sealable freezer bag. This will help prevent the mushrooms from sticking together and allow you to easily grab the amount you need.





Long-shelf life

Changes texture and flavor


Retains texture and flavor

Limited shelf life in the freezer

Another way to preserve your mushroom yield is to pickle them. This is a great option if you want to add a tangy flavor to your mushrooms. Simply place your sliced mushrooms in a jar with pickling liquid and refrigerate. This method is especially useful if you have an abundance of mushrooms and want to add some variety to your meals.

By harvesting and preserving your mushroom yield using these methods, you can ensure that you always have a ready supply of fresh, delicious mushrooms to enhance your favorite dishes.


You have learned how to successfully cultivate mushrooms in your Core Keeper underground haven. By following the easy steps outlined in this guide, you can now produce your own bountiful supply of mushrooms.

With your new knowledge and skills, you can continue to expand your underground farming endeavors and experiment with different mushroom species and substrates. Remember to maintain the ideal growing conditions and care for your mushroom beds regularly to ensure a healthy yield.

Enjoy the delicious and nutritious fruits of your labor, and share your newfound expertise with others interested in mushroom cultivation. Happy farming!


What is Core Keeper?

Core Keeper is a simulation game where players can build and manage their own underground civilization. It offers a unique experience of creating and maintaining a sustainable subterranean society.

Can I grow mushrooms in Core Keeper?

Yes, you can grow mushrooms in Core Keeper. The game provides a dedicated feature for mushroom cultivation, allowing players to delve into the world of fungi farming.

Is mushroom cultivation easy in Core Keeper?

Yes, growing mushrooms in Core Keeper is relatively easy. By following the right steps and providing optimal growing conditions, you can successfully cultivate mushrooms in your underground haven.

What are the basics of mushroom cultivation?

Before starting mushroom cultivation, it’s important to understand the basics. This includes learning about different mushroom varieties and their preferred growing conditions.

What is the ideal growing environment for mushrooms in Core Keeper?

The ideal growing environment for mushrooms in Core Keeper includes specific temperature, humidity, and lighting conditions. It’s essential to create the perfect environment to ensure successful mushroom growth.

How do I choose the right mushroom species for Core Keeper?

Not all mushroom species are suitable for growing in Core Keeper. It’s important to select the mushrooms that are well-suited for the underground environment of Core Keeper. Understanding the characteristics and requirements of different mushroom species can help you make the right choice.

What is mushroom spawn and how do I prepare it?

Mushroom spawn refers to the mycelium, which is the vegetative growth of the fungus. To prepare mushroom spawn, you need to select the appropriate starting material, sterilize it, and introduce the mushroom culture. This essential step ensures the successful growth of mushrooms in Core Keeper.

How do I create a mushroom growing substrate?

The mushroom growing substrate serves as the nutrient-rich medium in which the mushrooms will grow. There are different options for creating a mushroom growing substrate, and it typically involves combining organic materials like straw, sawdust, or wood chips with the appropriate additives.

How do I plant and care for mushroom beds in Core Keeper?

Planting and caring for mushroom beds in Core Keeper involves the step-by-step process of preparing the substrate, distributing the spawn, and maintaining the right environmental conditions. Proper watering and monitoring the growth of the mushrooms are essential for successful cultivation.

What are the best practices for harvesting and preserving mushroom yield in Core Keeper?

Harvesting mushrooms in Core Keeper requires careful attention to the maturity of the fruiting bodies. Once harvested, proper handling and storage techniques need to be employed to preserve the mushroom yield. Following these best practices ensures that you can enjoy your freshly grown mushrooms for as long as possible.