B+ Grow Kit XL 2100 ml – GetMagic® | Magic Mushroom Kit

Why choose the B+ XL?

If you already know the B+ strain — or you simply want maximum yield from day one — the 2100 ml XL kit is the way to go. Nearly double the substrate means more mycelium surface area, more pins, and significantly larger harvests across every flush.

The B+ psilocybe cubensis produces broad, fleshy caps (20–70 mm) that range from honey-gold to warm brown as they mature, set on thick, pale stems (40–125 mm) that bruise blue-green when handled.

In the XL format, individual mushrooms tend to grow even larger thanks to the greater nutrient reserve in the substrate. B+ is one of the most forgiving strains available — it tolerates temperature fluctuations and minor mistakes better than almost any other cubensis.

The experience is warm, visual, and emotionally open: colourful closed-eye visuals, gentle euphoria, and a friendly headspace that suits both solo reflection and social settings. B+ sits in the moderate potency range — accessible for newer users while still delivering a full experience at standard doses.

Growing the B+ XL

The setup process is identical to the 1200 ml kit — same grow bag, same method, same temperature. The key difference is patience: the larger substrate volume means colonisation and pinning may take a few extra days compared to the standard size. This is normal. Once fruiting begins, the XL kit typically outperforms the standard kit not just in total yield but in individual mushroom size.

B+ — strain specifications

Frequently asked questions

What’s the difference between the 1200 ml and 2100 ml XL kit?

Same strain, same method, bigger box. The XL contains nearly double the colonised substrate, which translates to higher yields (400–800 g vs. 200–400 g), larger individual mushrooms, and typically an extra flush or two. If you know you enjoy B+ and want more from a single grow, the XL is the better value.

What yield can I expect from this 2100 ml XL kit?

The B+ XL typically produces 400–800 g of fresh mushrooms across multiple flushes. B+ is one of the highest-yielding cubensis strains, and the XL format maximises that potential. Actual yield depends on temperature, humidity, and hygiene during the grow.

Can I use a heat mat with the XL kit?

Yes — if your room temperature drops below 21 °C, a heat mat helps maintain the ideal 24 °C. Place it underneath the kit, never directly against the grow box. The XL kit has a larger footprint than the standard size, so make sure your heat mat covers the base fully. A thermostat is recommended to prevent overheating.

Be sensible

Check out the responsible use page for more information on do’s and don’ts.