Historical clue formulations

• Extract used in brewing — 2016-11-06
• St. John's, for one — 2013-05-11
• St. John's ___ (herbal remedy) — 2011-01-11
• Ending of some plant names — 2004-07-17
• Herbaceous plant — 2004-05-09
• Follower of St. John's — 2002-05-17
• Plant, in combos — 1996-05-04
• Ending of many plant names — 1994-04-16