Chrysanthemum Leaves Turning Brown. Here are some tips about caring for them and keeping them looking their best. Chrysanthemums turning brown symptoms.

Check on a weekly basis for signs of abnormal growth or decay on the flowers and leaves. Because fall is generally wetter with lower light and cooler temperatures mold and fungal spores thrive. Browning and blackening extends down the stem causing the flower to droop.
Petals exhibit a brown discoloration.
Cut off wilted and old leaves that would help to open your plant for more aeration. Because fall is generally wetter with lower light and cooler temperatures mold and fungal spores thrive. Petals exhibit a brown discoloration. Then a second application one week later.