B+ Liquid Culture - Cloud920

About the B+ liquid culture

The B+ liquid culture is a Heritage Series isolate of Psilocybe cubensis — distinguished by its unusually long stems (averaging 15-20 cm, reaching up to 35 cm) and a lab-confirmed above-average potency profile that sets it apart from most other Heritage strains. Cloud920 classifies it within the Heritage Series and has isolated it under fully controlled lab conditions. Part of the Cloud920 cubensis liquid culture range .

Origin and history of the B+ strain

B+ was introduced by a cultivator known online as "Mr. G," who initially marketed it as a hybrid between Psilocybe azurescens and Psilocybe cubensis — a claim that generated significant controversy on Shroomery forums and was later disproved. Genetic analysis confirmed it is a pure P. cubensis cultivar with no P. azurescens contribution. Despite the disputed origin story, B+ gained wide traction in cultivation communities from the 1990s onward, partly due to its forgiving growth profile and consistently high yields on diverse substrates including manure, straw and grain.

What makes this B+ culture distinctive

Three traits make B+ stand out among Heritage cubensis isolates: the strikingly elongated stems (15-20 cm average, with specimens recorded at 35 cm), the caramel to golden-brown caps measuring 2.5-7.6 cm in diameter, and a wide temperature and substrate tolerance that makes it one of the most forgiving strains for new cultivators. Bruising is blue throughout the fruiting body, spore prints are dark purple-brown, and the strain is considered a heavy spore depositor — useful for microscopy work. Growers looking for a faster-colonising Heritage comparison can explore the McKennaii liquid culture .

B+ potency profile

B+ is one of the few Heritage cubensis strains with peer-reviewed potency data. A 2024 study published in the Journal of Fungi (PMC11856550) places B+ at approximately 1.11% psilocybin (11.1 ± 2.5 mg/g) and 0.022% psilocin on dry weight, giving a total tryptamine figure of roughly 1.13% — meaningfully above the cubensis average of around 0.63%. Oakland Hyphae Psilocybin Cup results show additional variance across individual grows (averaging 0.73%, peaking at 1.38%), which reflects the well-known Shroomery principle that substrate selection, harvest timing and drying method have a larger influence on final potency than genetics alone.

What you receive in your Cloud920 syringe

You receive one 10cc syringe of Cloud920 B+ mycelium, pre-loaded with a sterile needle. The syringe contains QC-verified mycelium suspended in Cloud920's nutrient broth, produced in a lab-controlled environment with viability, sterility and morphology checks on every batch.

How to inoculate with this liquid culture

Cloud920 recommends 2-3 cc per small grain bag, 3-4 cc per medium bag and 4-5 cc per large bag. Cloud920's sterile growth medium is a useful option if you want to expand the culture before inoculating a bag. Visible mycelial growth typically appears within 10-14 days under stable conditions, with full colonization completing in roughly one month. Store the syringe cool, dark and upright, and use within the shelf life printed on the label.

Microscopy and research use only

This B+ liquid culture is sold for microscopy and mycological research. Cultivation of psilocybin-producing fungi is regulated or prohibited in many jurisdictions — verify your local legislation before use.

Frequently asked questions

How long does the B+ liquid culture take to colonize?
With Cloud920's nutrient broth, visible mycelial growth typically appears within 10-14 days. Full colonization of a small to medium grain bag completes in roughly one month under stable conditions at the strain's preferred fruiting range of 23-26 °C.

How is a liquid culture different from a spore syringe?
A spore syringe contains spores that must first germinate before mycelium can form. A liquid culture already contains live, expanding mycelium — shortening colonization by roughly two weeks and reducing contamination risk.

How should I store this Cloud920 syringe?
Refrigerate at 2-8 °C, upright, in the original sleeve. Keep away from direct light and freezing temperatures. Use within the shelf life printed on the label.

Why does this product say "for microscopy and mycological research"?
Cultivation of psilocybin-producing fungi is regulated or prohibited in many jurisdictions. This syringe is sold for microscopy and mycological research purposes only — check your local legislation before use.

Is this Cloud920 B+ culture lab-verified?
Yes. Every Cloud920 batch is produced in a lab-controlled environment with QC verification on viability, sterility and morphology before the syringe is filled and sealed.