B+ XL Mushroom Grow Bag

The B+ XL Mushroom Grow Bag is one of the most popular Psilocybe cubensis varieties among home growers. This strain is known for its strong genetics, consistent growth and user-friendly nature. Thanks to the fully colonised substrate, you can start the fruiting phase straight away, without having to add spores yourself or carry out any sterilisation work.

“B+ is a popular Psilocybe cubensis strain known for its strong mycelium, reliable growth and forgiving nature. As a result, this strain is often recommended to novice growers.”

At 24High, we believe it is important for growers to have access to clear and honest information. Read more about what growing your own entails before you start, or check out our blog on the complete guide to growing your own magic mushrooms.

What is the B+ Mushrooms XL Grow Bag?

This grow bag contains a nutrient-rich substrate that is fully colonised with healthy Psilocybe cubensis mycelium. This means you don’t have to inoculate it yourself or wait for colonisation. As soon as the right conditions are created, the mycelium can start forming fruiting bodies.

Over the years, B+ has built up a strong reputation within the cultivation world. Many growers appreciate this strain for its combination of reliability, ease of use and consistent performance.

Why choose B+?

B+ is often chosen by people looking for an accessible and stable growing experience. Whilst some strains are more sensitive to small fluctuations in temperature or humidity, B+ generally continues to perform well under a wide range of conditions.

• Suitable for novice growers
• Robust and resilient genetics
• Adaptable to changing conditions
• Consistent development
• Reliable results over multiple flushes

It is precisely this combination of characteristics that has made B+ one of the most popular cubensis varieties worldwide.

The fact that a variety is forgiving does not mean that you can simply leave the cultivation process unattended. Read more about attention, monitoring and the different stages of the cultivation process.

Who is this grow bag suitable for?

The B+ grow bag is suitable for a wide range of users. Both beginners and experienced growers regularly choose this strain due to its predictable growth cycle and easy care.

• Novice growers
• Home growers without a professional grow room
• Growers looking for a stable strain
• Users who want to achieve multiple flushes
• Fans of reliable genetics

Growth characteristics of B+

B+ typically grows evenly and steadily. The mycelium develops robustly and is less sensitive to minor changes in the environment than some other varieties.

• Average growth rate
• Strong and healthy mycelium
• Good resistance to mild stress factors
• Medium to large fruiting bodies
• Consistent development between flushes

As a result, this strain is often regarded as one of the most user-friendly options within the Psilocybe cubensis range.

How do you use the B+ grow bag?

As the substrate is supplied fully colonised, you can start the fruiting phase straight away. A clean working method and stable conditions are important for a successful harvest.

Important: Small slit below the air filter

Below the air filter on the grow bag, there is a small slit made by the manufacturer. This opening allows excess CO₂ and pressure to escape if the grow bag becomes inflated during the growing process. This is normal and is not damage. You do not need to do anything, and the opening should not be sealed or taped.

Click here: Mystic Fungi Guide

1. Place the grow bag in a spot with indirect daylight.
2. Preferably keep the temperature between 20°C and 24°C.
3. Ensure there is sufficient fresh air.
4. Avoid large fluctuations in temperature and humidity.
5. Check the development of the mycelium and fruiting bodies daily.

If maintaining a stable temperature is difficult, a heating mat can help. A grow light can also be used if there is insufficient natural light.

What can you expect during cultivation?

B+ is known for its predictable growth cycle. Many growers find this strain easy to care for, making it a popular choice for first-time grow projects.

Under good conditions, the grow bag can usually produce several harvests. On average, two to four flushes are achievable, depending on care, humidity and temperature.

The following factors are important for optimal results:

• Constant temperature
• Sufficient humidity
• Good air circulation
• Clean working environment
• Proper hydration between flushes

How does B+ compare to other strains?

Every Psilocybe cubensis variety has its own characteristics. B+ stands out primarily for its reliability and ease of use.

• More forgiving than many sensitive varieties
• More stable in varying conditions
• Easier for beginners than many specialist strains
• Reliable performance from start to harvest

Are you looking for more challenging genetics? Then take a look at our other Magic Mushroom Grow Kits for strains with different growth characteristics.

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Practical growing tips

• Always work with clean hands and materials.
• Avoid direct sunlight on the grow bag.
• Ensure there is plenty of fresh air during the fruiting phase.
• Check the humidity regularly.
• Moisten the substrate properly between flushes.
• Harvest on time to support the development of new flushes.

Even with a robust variety such as B+, questions may arise during cultivation about growth, conditions or the right moment to intervene. For additional guidance, see our guide on support and guidance during home cultivation.

Safety and points to note

A hygienic working method helps to minimise the risk of contamination. Although B+ is relatively robust, a clean growing environment remains essential for a successful harvest.

• Disinfect hands and work surfaces beforehand.
• Avoid extreme heat and direct sunlight.
• Check regularly for mould or unusual colours.
• Use the grow bag strictly in accordance with the instructions.

B+ Grow Kit Contents

• Contents: 2200 ml
• Strain: Psilocybe cubensis B+
• Stage: Fully colonized
• Yield: Up to 700 grams (fresh weight)

Frequently asked questions