B+ – Magic Mushroom Ready-to-Grow Bag XL

B+ – Magic Mushroom Ready-to-Grow Bag XL | Versatile, Resilient & Beginner Friendly

The B+ Magic Mushroom Ready-to-Grow Bag XL is a professionally prepared cultivation system containing fully colonized Psilocybe cubensis substrate. The entire inoculation and incubation process has been completed under controlled conditions, allowing the bag to start growing immediately once placed in a suitable indoor environment.

Prefer to compare formats? This strain is also available as B+ Grow Kit and B+ Liquid Culture Syringe. Read more in the B+ strain guide, or browse all Ready-to-Grow Bags. New to this format? Our guide on how to dry, store and preserve magic mushrooms covers what happens after harvest.

B+ is known for its exceptional adaptability and strong resistance, making it one of the most versatile cubensis strains available.

Grow Difficulty: Easy – Extremely Forgiving and Flexible

B+ is widely regarded as one of the most forgiving strains. It performs well across a broader range of temperatures and humidity levels compared to most other strains.

Compared to Golden Teacher, B+ is slightly more tolerant of environmental fluctuations, making it ideal for less controlled setups.

Ideal for:

• First-time growers
• Growers with less stable environments
• Users seeking a low-risk cultivation process

Growth Characteristics – Flexible and Robust

B+ stands out for its adaptability and steady performance:

• Moderate colonization speed
• Strong resistance to minor environmental stress
• Consistent and even flush development
• Medium to large mushrooms with variable size

It is less aggressive than McKennaii but more forgiving than almost any other strain.

Yield Performance Compared to Other Strains

B+ delivers moderate to high yields with strong consistency.

Compared to other strains:

• More forgiving than Golden Teacher
• More stable than Amazonian
• Slightly less dense than McKennaii
• Comparable reliability to Mazatapec but more flexible

This makes it ideal for growers who value flexibility.

Fully Colonized Substrate – No Preparation Needed

Each Ready-to-Grow Bag contains nutrient-rich substrate that has already been fully colonized with healthy Psilocybe cubensis mycelium.

This means:

• No inoculation required
• No sterilization needed
• Reduced contamination risk

You can start growing immediately.

Expected Flushes & Growing Cycle

Under stable indoor conditions (20–24°C), the B+ Magic Mushroom Ready-to-Grow Bag XL typically produces 2 to 4 flushes.

Best results depend on:

• Stable temperature
• Proper humidity
• Clean handling
• Rehydration between flushes

Thanks to its resilience, B+ performs reliably even with minor inconsistencies.

Why Choose the B+ Ready-to-Grow Bag?

• Fully colonized Psilocybe cubensis substrate
• Ready to grow immediately
• Highly resilient and adaptable strain
• Beginner-friendly and forgiving
• Consistent multi-flush performance
• Ideal for less controlled environments

The B+ Magic Mushroom Ready-to-Grow Bag XL is perfect for growers who want a flexible, low-risk, and highly reliable cultivation experience, making it one of the best strains for beginners and imperfect growing conditions.

Helpful guides & tools

A few tools to help you get the most out of this product.

• Strain Library
• Grow Guide
• Dosage Calculator
• Product Advisor
• Troubleshooting Center

Practical notes

An elastic band is fitted around the bag to help prevent side pin growth. We recommend leaving the elastic band in place throughout the growing process.

One corner at the top of the bag has been cut off to support proper air circulation. After each air exchange, close this opening with the supplied sticker.

Before starting, read our guide on how to use a Magic Mushroom Ready-to-Grow Bag for correct setup, air exchange, harvesting and additional flushes.