If you are using a broadleaf killer, there's no necessary gap
between spraying and seeding. However, there are some other
practicalities involved. IME this process works better if you:

1. Make sure the lawn is well-watered and not mowed for about a
week; this assures that the weeds are actively growing.
2. Apply herbicide.
3. Mow lawn a week later; resume watering and not-mowing for 2-3
weeks; this gives all the broadleaf seeds an opportunity to
germinate and establish.
4. Apply herbicide.
5. Mow lawn a week later; reseed.

You want reseeding to take place after temperatures have begun to
ameliorate in the fall, but enough before when the ground freezes
that the grass has an opportunity to create vigorous roots and
crowns . . . that's about a month. So, what you need to do is
find out the average date of ground freezing in your area, and
work back by 9-10 weeks to figure the last date on which you
could reasonably start this project. The first date will
typically be 2-4 weeks prior to that. So, if your ground-frost
average date is 15 December; you'd want to start this project
between 8 September and 6 October.

An alternative, and somewhat safer option in northern climes is
to kill of the weeds this late summer and fall, and reseed in
early spring.

Chris Owens

Dee wrote:

My lawn is fairly weedy. I would like to kill the weeds without harming
what grass is left (probably using a 2,4-D type spray) and then reseed in
the fall. How long do I need to wait before I reseed?


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