If you love eating Portabella Mushrooms as much as we do, you might have wondered if it possible to grow them yourself, in your own house or backyard.

Well, today we are here to tell you that yes, you can!

Furthermore, you don’t need to have a parcel of land with a forest to grow them, you can even grow these mushrooms indoors.

We strongly recommend doing this as it can be a lot of fun, it’s way cheaper than buying them in the market and most importantly, you’ll end up with some of the most amazing tasting Portabella mushrooms you’ve ever had.

So without further ado, here is our guide to growing Portabella mushrooms.

Growing mushrooms is not the same as growing plants. Mushrooms are fungi and as such aren’t bought from seed or seedling, but rather from the mycelia, which is usually sold mixed with sawdust, in a product called mushroom spawn- this product is akin to a seedling, whilst spores can be compared to seeds.

Growing Portabella Mushrooms Indoors

As we’re an urban gardening/farming magazine, it would make sense that we start off by showing how to grow Portabella indoors.

If you’re looking for the cliff notes, here’s what you’ll need to successfully grow Portabello’s Indoors:

  1. Mushroom Spawn or Spores– Growing from spawn is much easier and is what we recommend.
  2. Inoculated Growing Medium- The sawdust you use must be sterilized, the easiest way to do this is by heating off a bowl of water with the sawdust until it boils.
  3. Water, light and heat: Portabellos need a temperature of around 70 degrees Fahrenheit celsius to spread. They also need to be constantly moist and after a 3 week period of vegetation need some light to simulate the sun.

And that’s pretty much it. We’ll go into further detail further along the article.

There are several ways to do, the easiest one being buying a starter kit that includes all the necessary ingredients to successfully grow your portabello, all you need to do is add water.

Our Portabello Mushroom Growing Kit Choice: Giant Heirloom Portabello Kit


The Giant Heirloom kit is one of the most popular kits on the market. All it needs is temperatures of around 63 to 68 degrees Fahrenheit and some water to thrive and it can yield up to 60 mushrooms per season.

Portabello Growing from Scratch: Components Needed

Alternatively, if you want a bigger yield from a bigger space, you can simply buy the components needed and do it yourself.

Here’s what you’ll need:

  1. Portabello Mushroom Spawn
  2. Sawdust/Growing Medium
  3. Heat Light

The first thing you’ll need is the spawn. There are several reputable suppliers, including Fire Light Heritage Farm, fungi.com, and mushroom mountain.

After you’ve got your spawn, it’s time to take care of the growing medium. This should be a manure composted that you can buy at your local garden shop. As we’re growing the mushrooms indoors, sterilization won’t be necessary.

Finally, you need to propagate the spawn in a humid environment with no light until the fungi start to appear. About 10 days after, the mushroom will be ready to see light, which can be done through the use of heat-emitting light bulbs, such as the ones showed below:

Temperatures shouldn’t leave the 50F to 70F range and the growing medium should be constantly moist, so buying a sprinkling bottle is recommended.

And there you have it. You are now ready to successfully grow portabellas in your own home! Feel free to share any feedback and experiences in the comment box below.