Best Weedkiller to buy ?

Make 100% sure that the spray doesn't carry whilst you apply to the jungle. (You need to do this anyway, otherwise your neighbours won't thank you).

Some say to use a watering can + dribble-bar but I think that most just runs off the plants.

I use a knapsack sprayer set to a rough, rather than fine, spray - so it is less likely to carry. I hold the nozzle very close to the plants I am treating (rather than several feet above) and spray when there is no wind (the wind usually drops in the evening).

Careful where you walk afterwards - e.g. if your boots have got chemical on them avoid leaving dead-grass footprints across the lawn!

Weed k9illers like Glyphosate / Roundup are nutralised on contact with the soil, so won't "linger" - but check the instructions.

In he case of Glyphosate it is important that it doesn't rain for at least 6 hours (I think) after application.

Half of our plot is now bedded and planted - Hurrah, but the other half is like a jungle and getting consistently worse.

Mmmm..........

Im going to have to resort to weedkiller - what do I do about protecting the stuff I've already got growing?
 :happy:

You could use a weed killer, but you don't have to. Many years ago when I had to deal with over grown bits, we just didn't even think weed killer. A rotary mower hacked it down, though I came across a scythe, and that was more fun. I was about 15 at the time. The mower kept things under control, and we just dug through the the weeds as and when.

I don't use WK now cos it costs money, and cos of what celjaci wrote about.