If you do not stick to your fertilization schedule as you planned, you can fertilize as soon as you remember. Just be sure to avoid fertilizing during the hottest part of the summer – especially for cool season grasses which will not be growing much during that time.
If you are late in late summer or fall, then just think about whether your grass is still going to be growing for a few weeks or not. If it is, then feel free to fertilize! For cool season grasses, you have a bit more time in the fall as that is when the lawn’s root system is doing a lot of root growth.
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