dear LJB, This growing season we had mostly what i would call rust colored die back mainly on flowering plants in our newly rebuilt raised boxes.. it was glaringly noticeable on the Dalia stalks that where dug up from our old rotting wood grow bins some sliced in half by the { eager but plant knowledge lacking high school kids} led by a master carpenter in building our new raised beds of which we have 3- 4ft X 8ft boxes and two 3ft X 8ft grow boxes. it was also most noticeable on the sunflower stalks.The. rust colored leaves where not evident on the fruit and vegetable plants. We that is Premier Living, Assisted Living Facility had soil tests done in November that showed unusually high amounts of Phosphorous and potassium and generally low amounts of Sulfur.and of course Nitrogen.as you answered before P and the K are probably due to a sampling error or in this case a sampling size error. I went thru one of the Mysoiltesting.com kits and found the size of the soil sample sent in to the company to be 29.6 cc The bottom line of this novela is that prior to this years crops of flowers and vegetables ALL the plants looked healthy after a soil test at the wrong time of the year and your recommendations for amendments. I know this is not much information to base an answer on the only other factor i can add is the Growing Gardens group placed "compost" of unknown composition in all but one of the new grow beds.To me it looked like mothing but bark fines and sand.