How to Grow Portobello Mushrooms
To grow portobello mushrooms indoors and outdoors, you can follow these tips. We have a more detailed step by step guide below:
Step 4: Fill your planting medium with the composite
This may sound quite simple. However, it is one simple step you wouldn't want to miss out on.
After successfully building or purchasing a growing medium, the next step would be to fill with the manure compost. Make sure to fill them in properly.
If you want to ensure your mushrooms grow big and without any health problems, you may also want to sterilize your planting materials.
You can do this by tightly covering the compost for about 2 weeks or more before going ahead to plant the spores.
However, this is not entirely necessary if you're growing indoors. What sterilization does is to just reduce the risk of contamination in your mushrooms.
Step 5: Sprinkle your mushroom spores
After filling the compost in, you'd also want to sprinkle your portobello mushroom spores on the compost material.
Mix the spores, properly, with sufficient compost in the bed you've prepared. Instead of mixing, you can also cover lightly with peat moss or some more compost material.
Step 6: Cover with a newspaper/cloth
The next thing to do would be to cover the compost with a newspaper or with a cloth to keep your bed moist always.
You'd also have to regularly spray the newspaper or cloth for adequate moisture.
Mushrooms need adequate moisture to grow. So, you might want to keep the humidity in and around your growing bed up by spraying once or twice per day.
Step 7: Remove newspaper/cloth
After two weeks, the mushrooms should start shooting out.
You can lift the covering to check for the tiny, white sprouts. If they're there, then it's time to remove the covering.
However, if you still notice some white streaks in the compost, leave the newspaper or cloth in place. These white, web-like streaks are an indication that your mushrooms are yet to fully take root in the compost.
Step 8: Keep spraying until they're fully mature
When you're entirely sure the mushrooms are rooted properly, you can then remove the covering you used.
Continue to spray the compost until your mushrooms are grown. This shouldn't take long—between 10 to 20 days, all things being equal.
You might still want to wait a bit longer for the mushroom caps to fully unfurl if you want the portobellos. They are usually about 1.6–2.4 inches long.
When your portobellos are out, then they should be ready for harvest. And, ultimately, for your consumption!
You can harvest your portobellos early if you want to. However, you'd only be harvesting criminis and not the portobellos you want exactly.
Here is a good video that shows you how to grow in a 5 gallon bucket:
The duration of cultivation should depend entirely on how big you want them to grow. Once you're satisfied with the size, and it's not up to 6 weeks yet, you can go ahead to pick and devour your mushrooms however you want.
Is It Difficult to Grow Portobellos?
Portobellos have been described as the easiest species of mushrooms you can grow, whether indoors or outdoors, using any preferred growing medium and method.
Portobellos are easiest to grow indoors because you wouldn't have to worry about extreme changes in weather, pests and other issues mushroom farmers are likely to encounter.
To make growing even a lot easier for you, you can use mushroom growing kits that you can easily purchase online. Mushrooms growing kits are handy, and shouldn't cost you too much.
Is Growing Portobellos Expensive?
The straight answer is an emphatic, NO.
Portobellos are really not expensive to grow.
All you need is a growing medium (which you can easily build by yourself), adequate water supply, manure compost, mushroom spawns, and a few sheets of newspapers or a piece of cloth.
And, of course, you need a comfortable growing space in your home too.
The growing materials that might cost you are the spores and the growing kits (which come at a price for no stress at all). Other than these, every other thing you'd need should not be beyond your reach.