How to Grow Portobello Mushrooms (Plus Video)

Are you looking to begin growing delicious portobello mushrooms at home, but you don’t quite know how or where to get started? The good news is it isn’t difficult or terribly expensive, and you only need a few supplies to get your mushroom crop going.

How to Grow Portobello Mushrooms

When growing a larger species of mushrooms like portobellos, you need a sufficiently sized spot to plant and grow them, such as a large plastic under bed storage container – at least four feet by four feet – as well as compost, peat moss, and newspaper. Fill your container with compost at a depth of six inches, sprinkle with your spores, and gently tamp the mixture down.

Your growing container should stay in a dark room or cabinet that you can keep between 65 and 70 degrees Fahrenheit until you begin to see white growth across the surface, then spread a layer of dampened peat moss over the top. Cover the container with newspaper and mist water over the top twice a day for two weeks before you look underneath the paper to check in on your portobellos.

When you can see tiny white mushroom heads, you can remove the paper and then mist with water daily. If you don’t have mushroom heads yet, leave the newspaper on and continue misting twice daily for one more week.

Harvest to suit your preference in size – you don’t have to wait until your mushrooms are the size of your hand to pick and enjoy them. Since you can closely control the temperature indoors, you can grow portobello mushrooms year round.

Check out the video below on easy ways to grow mushrooms at home. The video uses cremini mushrooms; however, Portabello mushrooms are just slightly older button mushrooms and cremini are simply the brown version of button mushrooms.


How Difficult Is It to Grow Portobellos?

While the popular belief is that growing mushrooms is incredibly difficult and time consuming, portobellos are not only easy to grow, they’re also robust enough that you can grow your crops inside or outside. All it takes are interest, patience, and the supplies to grow beautiful mushrooms.

Acquiring Supplies

While you can go to the hardware store and garden supply to obtain all of the items needed to grow portobellos, you don’t necessarily have to. There are a number of websites out there that assemble kits containing everything you need to start growing right away.

An Investment of Time

Mushrooms’ growth period doesn’t typically take a long time – portobellos, for example, take only a couple of weeks from the time you put spores in the growing material to harvest time. Aside from waiting for your mushrooms to grow, the most time you’ll spend is gathering supplies and getting everything ready.

Companion Crops for Portobello Mushrooms

Companion crops are two or more plants that grow well together for any reason, such as pest control, pollination, or simply maximizing space. If you are looking to grow mushrooms in among your vegetable garden, they grow well with perennials like asparagus and Jerusalem artichokes.

Since mushrooms grow well in shade, they can also be planted beneath trees that provide heavy shade all day, provided you are in a temperate climate. Just make certain to keep them moist and safe from animals that may be tempted to dig.

Don’t Go It Alone

While growing mushrooms seems like an incredibly niche pastime, there is an enormous community of amateur mushroom growers out there, especially if you look online. By connecting with others, you can get tips you might never have thought of, celebrate successes, and have a shoulder to cry on just in case you have trouble of one sort or another with your crops.

Is Growing Portobellos Expensive?

Getting started growing your own portobello mushrooms at home isn’t at all expensive. The basic supplies are quite cheap, and chances are high that you can obtain everything locally.

Be careful buying supplies online, as some specialized mushroom supply sites do put a higher price on equipment that they claim you absolutely must have. Amateur home growing of mushrooms requires very little, and you shouldn’t have to spend an arm and a leg to get started.

The mushroom grower in this video takes you through the entire process performed via one method. She shows everything from preparing the portobellos for making spore prints, to creating a growing container.

Getting Serious

If you enjoy growing mushrooms once you get started, you might consider becoming more serious about it by selling them to local shops or at your farmer’s market. Buy a good book on mushroom cultivation, explore other growing techniques, and have a chat with other mushroom farmers to expand your horizons.

You could also think about getting in touch with professional mushroom farmers for advice and tips. Most farmers are happy to help, many of them having started out right where you are in the beginning.


Can you grow portobello mushrooms in coffee grounds?

Coffee grounds are an excellent growing material for home grown mushrooms. Before planting, moisten the grounds and spread them into your growing container.

After adding your spores to sawdust, mix by hand into the top one inch of the coffee layer. Cover with a layer of cellophane wrap and poke holes evenly across the cellophane for ventilation.

Are button mushrooms and portobello the same?

Portobellos, button mushrooms, and cremini mushrooms are all the same species. The only difference is usually the size they are harvested at and the names they are sold under to differentiate those sizes.

Are mushrooms good for your health?

Like most edible plants, mushrooms do have some great health benefits. If you enjoy them, rest assured that they are a wonderful addition to a healthy diet.

Mushrooms are chock full of niacin, riboflavin, and pantothenic acid, which are good for your heart. Niacin keeps your nervous system working properly, riboflavin breaks down food into components your cells can use, and pantothenic acid helps your body to convert your food into energy.