How To Grow Portobello Mushrooms In 3 Ways

If you enjoy gardening, why not grow Portobello mushrooms in your backyard? Portobello mushrooms are one of the most popular ingredients used in many restaurants. You can sauté, grill, or steam them.

I love eating mushrooms because of their flavor and high nutritional value. Since I always buy mushrooms every time I do my weekly grocery, my neighbor suggested that I should probably try growing them in my backyard. I did a little research and found out that Portobello mushrooms are actually easy to grow, and I decided to go for it.

In this tutorial, I‘ll teach you some steps on how to grow Portobello mushrooms successfully in your home.

There are three ways to grow Portobello mushrooms in your home. You can do it outdoors, indoors, or use a growing kit.

The key is to utilize the right tools, techniques and plant them under the right temperature and environment.

Growing mushrooms outdoors

1. Check the temperature

how to grow portobello mushrooms outdoor

The first step to planting Portobello mushrooms is to set the right temperature.

If you’re growing it outdoors, check the temperature and make sure it doesn’t go over 70°F during day time, and it shouldn’t go below 50°F at night.

2. Prepare the compost

Create a raised bed with a dimension of four feet long, four feet wide, and eight inches deep. Then fill the bed with compost and well-seasoned manure. Follow it up by covering the bed with cardboard and black plastic.

This creates solar radiation that helps sterilize the soil. Leave it for at least two weeks.

3. Plant your mushroom spores

After two weeks, remove the cardboard and plastic covering. Scatter a one-inch layer of mushroom spores on the compost and gently mix the spores into the soil.

Let it sit for a few weeks until you notice a white film on the surface. The white film is a clear indication that your spores are indeed growing.

4. Apply a moist peat

how to grow portobello mushroom

Sprinkle a one-inch layer of moistened peat moss evenly on the surface of the compost. Place a newspaper over the peat moss and use distilled water to spray it daily. Spray at least twice a day for 10 days.

Remove the newspaper after 10 days. Continue to spray the peat moss for another 10 days. Observe the soil and adjust the peat moss as needed.

Always monitor the temperature. Then you can start to harvest your Portobello mushrooms depending on the size of your preference.

Growing mushrooms indoors

1. Gather your materials

Use a tray, compost, peat moss, newspaper, and mushroom spores.

Technically, you’ll follow the same process as the outdoor method. However, you’ll have to look for a tray that is four feet in length and width, as well as eight inches deep.

2. Plant your spores

Fill the tray with six inches of compost, scatter the spores, mix it gently with the compost, and press the surface. Place the tray in a dark place and check until you notice the white film.

Apply a layer of damp peat moss over the compost and cover it with a newspaper. Spray it with distilled water for two weeks.

3. Check for growth

how to grow portobello mushrooms indoors

After two weeks, take out the newspaper and check if you see white heads developing in the compost. In case there are no whiteheads visible yet, put back the newspaper.

Continue to mist it every day for at least one more week. Then check again for any signs of development. By this time, you should be able to see the growth of the mushrooms.

Growing mushrooms use growing kits

Another way to grow your mushroom is by using a growing kit. Technically, using a kit is the easiest way to grow Portobello mushrooms.

A mushroom growing kit is quite affordable, and you can buy it for less than $50. There are a lot of available kits online that range from low, medium, and high-end growers.

A growing kit contains pre-inoculated media, or you can also do the inoculation on your own. All you need to do is open your kit, mist your box, and leave it in a dark and cool area.

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A low-end kit requires you to keep a certain moisture and temperature level during the entire incubation period to allow the mycelium to settle in the substrate. This procedure often develops between seven to ten days. Afterward, you need to keep your kit damp and dark.

Continue to spray the kit regularly. You can use distilled or tap water but never use water with chlorine. If you prefer to use tap water, leave it overnight to allow the chlorine to evaporate from the water.

A kit can usually produce a mushroom in a few weeks. You can expect a harvest of at least two to three for every kit. A Portabella mushroom growing kit can produce a minimum of three pounds in three months. Not bad, eh?

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Different growing methods

how grow portobello mushrooms

If you want to grow your mushrooms with the least possible effort, a mushroom growing kit may just suit you best. This requires less time and energy compared to other growing techniques. However, some gardeners prefer doing it the traditional way.

If you like getting dirty and want a bit of a challenge, you should try planting mushrooms the old-fashioned way. You need to put in more time and effort to check the temperature and development regularly. The old-school technique is actually a good way to learn and understand a mushroom’s growth process.

You can either do it outdoors or indoors if it’s more convenient for you. Some prefer doing it indoors because it allows them to control the temperature and environment. Indoor growing is actually more suitable for people who don’t have extra outdoor space.

Whichever method you choose, growing your own Portobello mushrooms is a great way to challenge yourself. It’s a fun and exciting learning process.

Once you gather your first successful harvest, you’ll feel a sense of achievement and fulfillment.

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Ben Bareja

Ben Bareja, the owner-founder-webmaster of This website was conceptualized primarily to serve as an e-library for reference purposes on the principles and practices in crop science, including basic botany. Read more here

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