Biostimulants have been used in turf for forever. Flicking through my heavily worn « Practical Greenkeeping » by Jim Arthur (who incidentally would have celebrated his 100th Birthday recently). I can see endless references to « biostimulants ». Sand and Seaweed stacked and turned, Soot, Cocoa waste, sewage sludge, spent mushrooms, etc the list goes on and on. What…