As seen on a great big bag of EZ-Straw Seeding Mulch:
EZ-Straw helps enrichen soil for . . . GREAT RESULTS!Enrichen caught my eye. The word is missing from the Oxford English Dictionary and Webster’s Second and Third. Google Books returns a number of instances of the word in print, many of which have to do with airplane fuel: “Lean until the engine runs slightly rough — then enrichen until it runs smooth.” The most recent results in Google’s Ngram Viewer show enrich outnumbering enrichen 3,151:1 (2007) and 3,096:1 (2008). I suspect that the use of enrichen is unlikely to embiggen any time soon.