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Chrysanthemums require medium to high fertility of 150 to 300 ppm N. Optimal substrate pH values for chrysanthemums range from 5.8 to 6.2. Chrysanthemums are susceptible to high substrate pH and soluble salts. Substrate pH above 6.5 inhibits iron availability and induce interveinal chlorosis (yellowing). High soluble salts result in marginal leaf necrosis (death).
Read more at e-GRO (W. Garrett Owen, Josh Henry, Brian E. Whipker)