Shenanigans
Well-Known Member
I'm also a fan of brown malt.
Reminds me of bread crust from batch bread which I used to eat as a kid in Ireland.
Reminds me of bread crust from batch bread which I used to eat as a kid in Ireland.

Fergus Fitzgerald, head brewer at Adnams, explained to me that they're lumbered with a pitching strain with two different yeasts. As much as they would like to, neither one of them, individually, can be used to get the character they want. One strain provides most of the flavour, the other the attenuation. Either used by themselves doesn't work. As it's a total pain in the arse for them - especially keeping the right balance of the two as they don't propagate at the same rate - I'm inclined to believe them.So just more theory then. And very controversial, too, in terms of mutation models. I’m not sure I’d want to offer that as any form of supporting evidence for mysterious claims made by breweries and their marketing department’s spiel, which likely has more to do with selling beer than genuinely fortuitous outcomes of unconsciously repitching slurry for decades.
Having slept on it, I can divide my skepticism here. There’s the logic among home brewers (once including myself) that pitching multiple yeast strains is going to add some desirable, unique complexity in the end product. Something demonstrably worth the extra effort. Something 'special'. As I already typed I no longer accept this to be true, based on my experience involving many trials. Biased by my own taste mainly, to be fair. But this isn’t necessarily the same as serially repitching a brewery culture over at least several decades. If the brewery's yeast went bad it was replaced by calling in a favour. No big deal really, the main focus was producing beer and selling it. I think that's the hard reality fogged in mysterious, romantic stories.
For those that have apparently remained good for long periods, how do we know the beers produced haven’t changed due to the yeast population evolving ‘this’ way and ‘that’ over time, becoming a mixed population? I’m not talking about abrupt changes, ‘good’ or ‘bad’. Gradual change. This is a more realistic model, which doesn’t require anything to hide behind. We both know what would likely happen if a pure brewer’s yeast colony were cultured up and serially repitched by the bucket load over years. It would diversify and become a mixed population. Genetic diversity accumulates over time. Not necessarily different strains mind. But that is possible and they’d be closely related and perhaps more compatible than a designed mixture of strains. We hear a lot of talk about multi-strain yeast cultures, but, again, there’s rarely any evidence to support the claims. What I’d like to see is some credible evidence to back up the claims. That’s not too much to ask for, is it? As a proud Brit who enjoys a good English pint, I’m more than happy to defend British brewing heritage, but I refuse to talk ***** about it. How difficult can it be to design a project, perhaps for a PhD student at Herriot-Watt or Nottingham, to characterise a rumoured multi-strain brewery culture, described as ‘among the finest in the land’, then ferment with individual strains and various combinations of strains so as to demonstrate the brewery’s marketing department aren’t talking *****? If it's as good as they claim, isn't it worth preserving? The fact such evidence hasn’t been presented so far says something. The methodology (technology) to do so quite easily has been around for decades. I’m afraid it looks to me like they’re talking *****. And I get excellent results using pure yeast strains from traditional English breweries to ferment my home brew. I know they’re pure because I plated them out and isolated them myself.
Edit: Interim summary: the competing hypotheses here are: stable multi-strain brewery yeast vs evolving chancers flogging beer. It seems to make more sense when you ditch the romanticism.
According to Miles Jenner, Harvey's yeast sometimes goes a bit weird, then sorts itself out again. Having seen their yeast handling - open-topped tubs of yeast slurry - I'm amazed they haven't had all sorts of horrible problems. Who knows how genetically similar it is to the John Smiths yeast they first pitched in the 1950s.Are there any data at all that show these multi-strain slurries have remained stable over extended time periods, in what are potentially very competitive microbial systems? Otherwise it's just heresy, interesting abstract theory and head brewers telling romantic stories. I can just see a head brewer grinning whilst telling mesmerised visitors how old and special the brewery’s multi-strain yeast are. I gave up trialing multi-strain pitchings some time ago, when it became apparent it wasn't worth the additional effort. I think it's more to do with the inevitable outcome of cultural practices (including sloppy ones) and resistance against foreign discoveries and practices to manage single strains, i.e., control and consistency. I've been able to maintain pure yeast strains for several years without noting any 'drift'. It's a bit worrying some professional brewers can't. But I'm always happy to be disproved, if data show otherwise.
Here's a photo of Harvey's yeast storage:According to Miles Jenner, Harvey's yeast sometimes goes a bit weird, then sorts itself out again. Having seen their yeast handling - open-topped tubs of yeast slurry - I'm amazed they haven't had all sorts of horrible problems. Who knows how genetically similar it is to the John Smiths yeast they first pitched in the 1950s.
Harvey's is a Yorkshire square yeast in origin so needs to be roused.@patto1ro Yes, I'm well aware of all the romantic stories told by head brewers. My point was there's very little credible evidence to back them up. I find this very surprising. The ecology of fermentation of English cider apples has been well documented for years. All we have for England's brewing heritage are unconfirmed stories and general agreement Brettanomyces claussenii can bit a factor. Without evidence I refuse to take them seriously. It's not rocket science. Brewers do enjoy their lore, though, don't they? It sells beer. It's more likely the case they are hoping to protect their 'secret' by sending folk down rabbit holes. Nor do I reject the idea that a brewers yeast slurry serially repitched over decades or longer is going to diversify. But that's not necessarily the same as different strains evolving. Just another untested hypotheses. In terms of Harvey's yeast, it's more than capable of defending itself after being top cropped then repitched a day or two later, whist at it healthiest, despite how things might be perceived as it waits sitting in open buckets. Putting a lid on might lead to unfortunate consequences with a beast like that. The strain I isolated from Harvey's slurry is surprisingly difficult to ferment with when following 'typical' home brew methods, but it is possible, if pitched at a very high rate (probably more comparable to what Harvey's pitch) at 17℃ and roused occasionally. Among my collection of Yorkshire strains it's safe to say it's the most aggressive and converts sugars at an alarming rate attenuating at 80-82%. In fact, I reckon it would eat kveik for breakfast.
Yes, I know very well, as I ferment most of my English ales in a Yorkshire square.Harvey's is a Yorkshire square yeast in origin so needs to be roused.
I haven't been able to find any data on the subject for traditional English breweries. I'm not saying the logic is wrong, just that my own observations haven't supported it and I haven't been able to find any data to support it either. So much for beliefs? Unless my skepticism - healthy in my view - can be demonstrated to be unjustified I have to accept the logic as little more than romantic lore. I'm always happy to be proven wrong, because it's the truth that matters more regardless.
But I seem to get comparable results using pure yeast strains isolated from individual colonies. Where's the 'magic' exactly? The technology to easily characterise multi-strain brewery slurries has been around for decades. A very simple experimental design to assess beers fermented with A, B compared with AB makes good business sense, especially if you could demonstrate to your customers they were buying a lot more than romantic stories. On the other hand, if it was a load of bollocks, you'd want to avoid confirming it, right? The marketing department would be up in arms.I don't have anything substantial to say on the matter at hand - although I am curious to learn about it - but I don't think I follow or agree with your reasoning here.
While your scepticism is appropriate, there's a difference between "I couldn't make it work, and they don't disclose how they do it" and "they are not [or even: cannot] be doing it".
If their particular handling of their multistrain yeasties was indeed a thing and, moreover, the source of their signature flavour, then it's not too surprising they wouldn't share it all too openly.
Very impressive. That's commitment building your own Yorkshire square. Does fermenting in it affect the flavour of the beer?Yes, I know very well, as I ferment most of my English ales in a Yorkshire square.
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Can you comment on any of the other points raised? Specifically the dire lack of even the most basic evidence to support the mysterious stories that abound re the use of multi strain yeast in traditional English breweries? My personal observations suggest single strains work exceptionally well by themselves.
Yes, the beers are more rounded, smoother and more interesting generally. More comparable to commercially available traditional English ales than underpitched home brew that can have unbalanced (amplified) yeast profiles jumping out of the glass. The ‘phenolic’ character associated with some Yorkshire strains is reduced quite dramatically producing some nice subtle, balanced complexity. Only seems to work well with true top croppers that like to climb out of the wort. It’s possible a highly active yeast head releases sufficient CO2 to minimise oxidation. I’m not convinced these strains benefit from air/O2 during fermentation, as sometimes claimed by head brewers. More lore? That logic doesn’t make much sense biologically. The rousing/recirculation is done periodically during active fermentation only, according to historical descriptions in the brewing literature. It’s very effective at getting yeast back into the wort, from the yeast head and off the bottom of the FV. A much improved fermentation performance generally. To top it, the yeast trough automatically traps the most active (healthiest?) yeast cells for repitching. Directly pitchable yeast this good are rarely available to buy. It has to be harvested and repitched within a few days to fully appreciate it and indeed the Yorkshire square design itself generally.Very impressive. That's commitment building your own Yorkshire square. Does fermenting in it affect the flavour of the beer?
I can only talk from my own direct experience. As mentioned before, Adnams need both of their strains to get the attenuation and flavour that they aim for. Neither on its own would work.
Other than circumstances like that, I'm sure single strains mostly work perfectly well.
Fullers had three strains until they moved to conicals. They picked the one which produced the most of the flavour. Brewers are very reluctant to do anything which might change the character of their beer. That would explain why they might stick with multiple strains when they weren't really needed.
A professional brewer (I can't remember which one, I'm afraid) told me that if you analysed the yeast of breweries who repitch, there would always be several wild strains present, but in tiny quantities. Too small to have any effect on the beer. The quantities of them were small because, obviously, the real strain would outcompete the wild ones being far better at fermenting the sugars found in wort.
I don't know what sort of evidence you're looking for about multi-strain yeasts. I've come across plenty of references in brewing texts, albeit mostly ones 50+ years old. I've discussed the topic a few times with brewers. They didn't pretend that there was any particular magic. But that it did have an impact on their beer. Each of the yeasts bringing something to the table, either in terms of flavour or fermentation characteristics.
Did you ever try verdant IPA within your nicely build fermentation something you got there? It produces the biggest Kräusen I've ever seen and the esters can get a bit extreme. Would be interesting to hear how it performs in such a unique environment.Yes, the beers are more rounded, smoother and more interesting generally. More comparable to commercially available traditional English ales than underpitched home brew that can have unbalanced (amplified) yeast profiles jumping out of the glass. The ‘phenolic’ character associated with some Yorkshire strains is reduced quite dramatically producing some nice subtle, balanced complexity. Only seems to work well with true top croppers that like to climb out of the wort. It’s possible a highly active yeast head releases sufficient CO2 to minimise oxidation. I’m not convinced these strains benefit from air/O2 during fermentation, as sometimes claimed by head brewers. More lore? That logic doesn’t make much sense biologically. The rousing/recirculation is done periodically during active fermentation only, according to historical descriptions in the brewing literature. It’s very effective at getting yeast back into the wort, from the yeast head and off the bottom of the FV. A much improved fermentation performance generally. To top it, the yeast trough automatically traps the most active (healthiest?) yeast cells for repitching. Directly pitchable yeast this good are rarely available to buy. It has to be harvested and repitched within a few days to fully appreciate it and indeed the Yorkshire square design itself generally.
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In terms of evidence, I’d like to see some data to confirm the claims, because without data they are just claims. Opinions. If the perceived logic is more than just romantic beliefs it should be easy to confirm with data and documented to better understand what’s going on. The null hypothesis is multi-strain yeast in traditional English breweries are merely the result of sloppy (by 20th century standards) yeast management practices. No one seems to have formally assessed multi-strain yeasts from traditional English breweries. There are no published data to support the claims. Therefore we can’t accept the logic. We’re stuck awkwardly clinging on to a belief. That doesn’t work for me. People have a tendency to make up all kinds of ****. Especially when traditional brewing is the topic. Present company excepted, of course.
Afraid not. Only used English strains to date. I have some Belgian strains that might be interesting, but haven't done any Belgian ales for ages.Did you ever try verdant IPA within your nicely build fermentation something you got there? It produces the biggest Kräusen I've ever seen and the esters can get a bit extreme. Would be interesting to hear how it performs in such a unique environment.
Isn't verdant ipa an English strain? It tastes at least English to meAfraid not. Only used English strains to date. I have some Belgian strains that might be interesting, but haven't done any Belgian ales for ages.
Yes, as a student of Hansen's I think I've read there was overwhelming rejection of 'a newly emerging continental practice daring to promote standardisation in British breweries'. Same reason we still drink pints, I reckon.Of 39 British pitching yeasts, 12 contained a single strain, 16 had 2 major strains, while the rest had 3 or more components.
From a paper to the IOB in 1959.
I think a later paper by the same author said that the number/proportion of multi strained yeasts had decreased.
Didn't Hansen try getting Burton brewers to adopt single strain yeast he had isolated, but met with overwhelming rejection?
Sorry, yes, apparently. For some reason I thought of an American strain. It doesn't really sound like my thingIsn't verdant ipa an English strain? It tastes at least English to me![]()
I thought the same. But this one really is different. Give it a try! I don't remember which one it is, but there is a liquid pendant to it which is literally not showing any difference in neither brewing properties nor resulting tastes.Sorry, yes, apparently. For some reason I thought of an American strain. It doesn't really sound like my thingEspecially if it's only available in dry format.
It flocs ok. It takes about three weeks after bottling to drop clear. Not a s04 but clearly also not a Windsor. It forms a nice compact sediment which doesn't get disturbed easily, so that's a big plus.LalBrew Verdant IPA™ – Ale Yeast. LalBrew® Verdant IPA was specially selected in collaboration with Verdant Brewing Co. (UK) for its ability to produce a variety of hop-forward and malty beers.
Interesting association and varied history at Verdant.
Our Beers
Hoppy, juicy, hazy, unfiltered, vegan-friendly beers! When Verdant began to bloom back in 2014, we decided that our focus would be hop-forward beers inspired by the New England craft beer scene. Over the last few years we’ve continued to develop both our core offerings such as Headband and Lightbulb, and special releases. We’ve placed an emphasis on balance and drinkability while taking inspiration from the beers of both the East and West Coasts of the United States.
Cornish water is very soft, so suited to those styles of beer.
@Miraculix How well does Verdant IPA yeast flocculate. The one I'm using currently (B4 from Brewlab) drops clear without finings in a few hours after rousing is stopped.
Low flocculation and a top-cropping yeast head (very persistent/reluctant to drop according to some descriptions) suggest it might be more suited to a Burton Union system? If so, carefully skimming off the yeast head as FG approaches is probably better than leaving it, in terms of the beer going brighter sooner, before packaging ideally.It flocs ok. It takes about three weeks after bottling to drop clear. Not a s04 but clearly also not a Windsor. It forms a nice compact sediment which doesn't get disturbed easily, so that's a big plus.
That's probably true. But quite a hassle with my fermenter, so I just play the waiting game. It's reasonably clear once the priming sugar is gone anyway, so it's ok for me. One to two weeks later it has fully cleared. It's a very easy to use yeast.Low flocculation and a top-cropping yeast head (very persistent/reluctant to drop according to some descriptions) suggest it might be more suited to a Burton Union system? If so, carefully skimming off the yeast head as FG approaches is probably better than leaving it, in terms of the beer going brighter sooner, before packaging ideally.
No, not yet I'm afraid.Have you tried the Swedish yeast yet? @Miraculix
I bought a sachet of it a week ago but haven't decided yet when and what do brew with it. Might try use it in my go to best bitter soon.Have you tried the Swedish yeast yet? @Miraculix
That's probably the best way to evaluate the yeast, with a tried and proven recipe. Let us know about the outcome!I bought a sachet of it a week ago but haven't decided yet when and what do brew with it. Might try use it in my go to best bitter soon.