The fertilizer and iron have separate purposes.
I use both products, plus a fungicide on my lawn.
The recommended fertilizer is good, provided that 15-30% of the nitrogen content is slow release. Do not purchase weed and feed products.
I fertilize 4 times per season, beginning in mid-April and ending in October.
I apply iron more frequently than the fertilizer- about 5-6 week intervals- during the same period stated above.
I apply the fungicide monthly, mostly as a preventative measure, because zoysia is so susceptible to fungus, which can be caused by a variety of conditions. Again, application is during the above stated period.
I do not apply any product between November- March.
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