How much light your cordyline needs depends on the coloring. Dark-colored cordylines can tolerate bright light once acclimated, but if your cordyline is variegated with lighter colors, indirect light is best. If the leaves appear washed out and whitish, then place your plant a little further from the window. If the leaves start to lose some color and turn darker, then acclimate it to a brighter spot.
Too much fertilizer can burn the plant’s roots leading to a slow decline and discolored leaves. Fertilize once a month during spring and summer. No fertilizer is needed during the dormant months of fall and winter. Always fertilize on watered soil and never on dry soil.