Activated charcoal and soluble starter nitrogen were added to fresh and aged pine bark prior to use as a container growth medium. All test plants grew equally well in either fresh or aged pine, regardless of activated charcoal or soluble starter nitrogen application.

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Author notes

Journal Series #4487 of the Oklahoma Agricultural Experiment Station, Stillwater, OK 74078.

2Professor of Horticulture and former graduate student. Current address of the junior author: Ornamental Extension Specialist, Kentucky State University, Frankfort, KY 40601.