7 Easy Steps To Grow Portobello Mushrooms

Maybe you are a passionate gardener who loves nothing but the thrill of tending to your own backyard space for the next creative project. From growing flowers to plants to crops themselves, you love a good challenge when it comes to cultivating your area with a bright, vibrant, and colorful diversity of vegetation.

Considering crops, you might have had your fair share of growing items like tomatoes, potatoes, peppereven corn. However, you are interested in taking it a notch up and trying your hand at growing Portobello mushrooms.

As it is a fungus and not actually a vegetable or fruit, these mushrooms are something that you have never grown before, so you know that it will be a good project to take all the way to the dinner table.

That said, perhaps you are not sure just how to get started growing Portobello mushrooms. That is why we are here to help! Read on to learn more in this article on how to grow Portobello mushrooms. We will give you the tips and tricks on how to get started. Soon enough, you will be harvesting some of the biggest, plumpest ones out there.

Without further ado, let us get down to it!


I. Things You Will Need For This Tutorial

Granted, there are many different ways of growing Portobello mushrooms. However, it only requires just a few, simple ingredients and pretty soon, you can take off on your mushroom-growing conquest! Down below, we present to you the items to get well on your way to growing them successfully:

a. Cardboard

While at first you might be wondering just how this piece of solid paper will help you out, know that it is a useful item that will produce a pseudo-solar radiation that ends up sterilizing the garden bed, as means of creating a space free from any possible contamination to make the mushrooms grow effectively.


b. Compost

In general, fungi grow especially well in compost, including manure-based ones. Often made from a rich mixture of elements, it will help to nourish the spores as they germinate.


c. Garden bed

If you plan to grow your Portobello mushrooms outside, having a garden bed will help for an easier drainage system.

d. Mushroom spores

Whether or not you choose to purchase them at your local home and gardening store or cultivate them from the existing fungi, mushroom spores are the key ingredient to get started on your mushroom-making journey.

e. Newspaper

Concerning indoor growing, newspapers are a great way to use for mulching, i.e. a decomposed item to offer nutrients in the soil as means of enriching the mushroom spores.

f. Peat moss

Also used for growing Portobello mushrooms indoors, peat moss provides an acidic pH which serves as a soil amendment for cultivating mushrooms, which thrive in acidic environments. In terms of obtaining peat moss, you can either choose to buy it at your local home and gardening store or try your hand at growing it yourself.

peat moss

g. Tray

For indoor growing, the tray acts like a garden bed to contain and support the mushroom spores. We advise you to look at the dimensions before using one, just to make sure that it is enough to hold all the ingredients. Besides, We can use plastic pots for their work.

h. Water

This is not to say that you need a ton of water: rather, just a little bit is more than sufficient to keep the mushroom spores damp and just moist enough to thrive and grow healthily.

II. Step-by-Step: How To Grow Portobello Mushrooms

Before getting started, you might be surprised to discover that Portobello mushrooms can be grown both indoors and outdoors, with both strategies yielding just about the same results, if done well. Depending on your gardening situation, one or the other will work better for you.

In any case, we provide you both ways—indoors and outdoors—to get you started growing those beautiful Portobello mushrooms:

a. Outdoors

1. Temperature check

When it comes to growing Portobello mushrooms, it is essential that the temperatures remain consistent, so that they grow consistently as well. Since you will be cultivating the spores outside, you will need to be careful with making sure that everything is at just the right temperature.

Generally speaking, it is best to cultivate them in temperatures no lower than 50 degrees Fahrenheit (10 degrees Celsius) and no more than 70 degrees Fahrenheit (21 degrees Celsius).

2. Build the garden bed

Construct a raised bed with measurements of 4 feet by 4 feet by 8 inches deep. As for materials, we recommend any type: brick, stone, wood, or any other sturdy item to contain it.

3. Add compost

In a careful manner, pour in somewhere between 5 and 6 inches of manure-based compost into the garden bed and cover with cardboard. This will sterilize your bed, so give it about two weeks to let it take effect before going any further in the mushroom-growing process.

4. Add the mushroom spores

Once sterilized, remove the cardboard and add the mushroom spores into the garden bed. Mix it with the soil and compost and give it a few weeks until a thin, white film (mycelium) starts to form a layer on top.

5. Add the newspaper and peat moss

Once the mycelium has developed, add the peat moss and newspaper on top of the compost.

6. Mist

Considering that Portobello mushrooms do not need a huge amount of water to thrive in, all you need to do is give the spores a light misting twice a day to help them grow well.

7. Harvest

After about ten days, the Portobello mushrooms should be ready to be harvested. Depending on how big you want them to be, you can either choose to let them continue growing inside of the soil, or just pick them as soon as they are ready. In the end, it is up to you!

For a more visual way of learning how to Portobello mushroom outdoors, check out this video here: 

b. Indoors

For growing Portobello mushrooms indoors, all you need to do is follow steps 2 through 6 from outdoor growing. It is a very similar process, and the only few differences are that you can control the temperature more inside than outside. Aim for 65 to 70 degrees Fahrenheit (18-21 degrees Celsius).

In addition, growing the mushroom spores indoors requires a bit of patience, along with trial and error. Once you mist them, you will need to check up on them from time to time in order to see whether they have grown their small white heads (the equivalent of mycelium). You will need to remove the newspaper to check, as well as replace it if it is not ready yet.

Once the small, white heads have formed, they are ready to be harvested. Follow the directions for the outdoor growing to do so.

For a video on how to grow Portobello mushrooms indoors, check out this one out:

III. Conclusion

Contrary to what you might have believed, Portobello mushrooms are surprisingly easy to grow and harvest. Not only that, but also they are hardy enough to be grown either indoors or outdoors. With a bit of patience and passion, you will surely grow some of the best, fullest ones for your next dinner meal.

Happy gardening!

Daisy Taylor

Daisy Taylor is a blogger at TheOneSunflower.com. I would try my hand at gardening. After many years of gardening at home. I have decided to share my passion with the world by starting this blog. I hope to give advice on all matters related to home gardening ..... Read more about Me here.

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