replying to Leo123, Iggy wrote:
1st option, IF you have a full 4 to 6-weeks of warm left. Scalp it with the
mower set to its lowest height to remove as much weed, especially any larger
weed leaves. Then, scarify, seed and water. The seed needs as much warm-time
as possible to establish roots to even make it to spring.

2nd option, maybe and likely the only thing you can do so late in the year.
Scarify and drop all of your weeders on everything to re-seed in spring. Weeds
won't be gone forever, many are like crabgrass and have already planted seeds
that will continue to return for years to come. Then, re-scarify, seed and
water for the 1st month of spring.

After that, it's only monthly treatments of Weed-B-Gon type products (they
don't kill the grass) to continually decrease the weeds and stop their
seeding, you need one full season to make a solid dent in the weeds. But, for
a long-neglected lawn you're looking at the next 5-seasons of greatly
decreasing Weed-B-Gon type treatments. It's never one & done.

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