If conditions are exactly right, the wort ferments on its own, as if by magic.
"We would never encourage irresponsible marketing of St John's Wort, " he told the BBC.
John's Wort grows wild in parts of Europe, where scientists have been studying it for decades.
Brewers typically make beer by fermenting a sweet, grainy nectar called wort with specific strains of yeast.
John's Wort is just as helpful as drugs, with none of the side effects, such as headaches or vomiting.
The flax-leaved St John's Wort is now spreading at Craig y Dre in Tremadog, according to Natural Resources Wales (NRW).
BBC: St John's Wort boosted by Gwynedd cliff scrub clearance
So to discover that a plant like St John's Wort has pharmaceutical properties does not rock me back on my heels.
The recent clinical trial the doses of the St John's Wort extract were similar in size to pharmaceutical doses of antidepressant.
St John's Wort has been used for many years in folk medicine to treat disorders such as burns, wounds and depression.
This beer is a blend of regular wort and clear Chianti must.
John's wort, a popular herbal remedy used primarily to treat mild depression.
John's Wort may not be well known in the United States, doctors in Germany prescribe for depression, and insurance pays for it.
John's Wort might be just as effective, and with fewer side effects.
Fermentation of beer traditionally involves placing wort -- the sweet malt liquid before it is fermented and turned into beer -- into a vessel.
The yeast fuses itself to the surface and feeds the wort at an increased rate, meaning the fermentation process takes only a few hours.
John's wort are safe, but this study demonstrates that there can be dangerous interactions when taken with other drugs prescribed to treat medical conditions.
John's wort can be sold as an anti-depressant, without any mention of the disturbing indications that the herb weakens the effectiveness of birth control pills.
And since no patent can be issued on Ginko Biloba or St John's Wort, there is no advantage to any company which pays to test natural drugs.
The thoroughly modern brewhouse installed in 1989 could crank out a lot more wort, and the squares for primary fermentation sit idle more days than they are used.
John's wort, the authors of the review found "good but limited" evidence for the anxiety-reducing effects of supplements containing L-lysine and L-arginine, two amino acids produced naturally by the body.
But Dr Ann Walker, senior lecturer in human nutrition at the University of Reading and a qualified medical herbalist, said the findings would make little difference to the average St John's wort user.
When they add nothing, as lambic-makers do, the untreated wort becomes a refuge for airborne wild microflora, which now have space to grow and food that would otherwise be hogged by beer yeast to eat.
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