Killing Weeds

donemedosh

For the weeds any systemic weedkiller is good enough. I use both weedol & roundup both do the job but do not cut weeds as the chemical works better as the weeds are growing. If you have weeds in the lawn get a lawn weedkiller kills weeds not grass. As for the lawn I would just cut it for now & then Autumn time reseed & topdress if you try to sow seed now you will have to water it more or less daily.

bris

The cheapest way is to use a vinegar and salt combination in a fine sprayer, this kills weeds more effectively than most of the useless overpriced weed killers I have bough over the years,

Rosate 360 is the professionals choice which I used to kill off a larger part of my garden that just went out of control, it works well and 6 weeks later it was cultivated and reseeded, It looks pretty good now but weeds are determined and they find a way.. I use the vinegar, salt combination to kill them individually as they appear and reseed but tbh it's a losing battle as the weeds seem to beat the grass seed everytime.

Troytempest

Keeping weeds out of a lawn is a process not an event.

TELLIT01

A vinegar and salt combination may be cheap but it also contaminates the ground for an indeterminate time.  Glyphosate becomes inert on contact with the soil.

Grenage

If it's very weedy then go nuts with glyphosate.  Kill any weeds that appear until autumn then reseed the lawn.

I bought rosate 360 concentrate online, and I suspect it will last a lifetime.

gardeningenthusiast

You've got it right about not cutting the weeds before spraying – they do need those leaves to soak up the weed killer properly.

For a garden your size, with a mix of weeds, I recently found something that actually works and doesn't mess with my lawn: a selective weed killer won’t hurt your grass and has a surfactant to stick to those pesky leaves. There are a few options too - a spot spray for just a few weeds, a small concentrate for modest invasions, and a large concentrate for... well, when it’s more jungle than garden. It's cheap and cheerful too! 

For those dry patches, give it a 2-3 week breather after spraying before you sow any new seeds. Lets the chemicals clear out so your new grass can thrive. 

Hope this helps!

CliveOfIndia

gardeningenthusiast, your reply is undoubtedly well-intentioned.  But given that this thread is well over 2 1/2 years old, I suspect the OP has got it sorted by now

(For information, the forum guidelines do request that old posts are not bumped unnecessarily)

Marb6145ky

You've got it right about not cutting the weeds before spraying – they do need those leaves to soak up the weed killer properly.

For a garden your size, with a mix of weeds, I recently found something that actually works and doesn't mess with my lawn: it's a selective weed killer that won’t hurt your grass and has a surfactant to stick to those pesky leaves: https://www.relentlessgardener.co.uk/product/lawn-weed-killer-spray/.

For those dry patches, give it a 2-3 week breather after spraying before you sow any new seeds. Lets the chemicals clear out so your new grass can thrive. 

Hope this helps!