Back in the day, 30-40 yrs ago, the rule of thumb was to fertilize lawns in the Fall with nearly zero nitrogen (N), and heavy on the phosphorus (P), & potassium (K). Reason being one did not want to stimulate leaf growth with nitrogen late in the season that would inhibit dormancy by stimulating leaf growth artificially late in the year, yet on the other hand, fortify root growth and overall plant health with a good shot of phosphorus and potassium for next Spring’s green up.
Flash forward to 2021… Now all the online “experts” insist that massive doses of nitrogen and zero amounts of phosphorus be administered in the Fall to achieve a better Spring green-up and overall superior plant health.
I’ve yet to be able to verify this notion from any reliable source, so, what’s your opinion?