: ''* When Boon's beers are bottled, they are marked with a best by date that is 20 years after the bottling date. '' <ref name=BoonGueuze>Boon Brewery, Best By Dates http://www.boon.be/en/our-beers/geuze-boon-old-style </ref>
For Boon's non-traditional lambic products, they reportedly spontaneously ferment approximately 40% of the wort and then blend it back in with the remaining wort.[<sup>'''citation needed] '''</sup>
BoonPalm's website also includes the following downloadable diagram detailing the process as lambic moves through the Boon brewery.<ref name=PalmBoonDiagram>Boon Brewery, Brewing Process Diagram http://newpalm.androidlabs.be/uploads/boon/brouwschema_spontanegisting_EN.jpg</ref>
[[File:Brouwschema spontanegisting EN.jpg|300px]]