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I use kerb granules. 6 month barrier from weeds.
I have a look at that i normally just use the roundup 360
Paradise I have used extensively in the commercial maintenance environment.
It is expensive and it has restricted fields of use - ONE application per year only.
Works well around factories, on gravel car parks etc - still get the odd weed but not as many.
It certainly not something that I would be using everyday, when you know what's in the product, you will know why it has so many warnings on such a tiny container.
Paradise / Chikara / Pacaya are all the same. It's recommended to mix with Glyphosate / roundup to give a long lasting total kill. Once per year use allowed.
Very toxic for aquatic life so 2m buffer zone needed for water course / ponds / ditches, plus be careful around drains. Not something to use without good reason IMO.
Something to think about when treating kerb edges on car parks etc is where does the water run-off go? Quite often it will be into a nearby stream. I spot treat with Roundup, really not keen on residual weedkillers.
I frequently use it..................... just 5 gms will treat 333 square metres and will keep things clear for 6+ months. I spot treat any llarge perenial weeds first with Roundup and then put the Paradise/Chikara down. Keep it well away from grass edges....... if the grass even sniffs the stuff, it dies!
Industrial use only...
I have used chikara occasionally - with the same sort of caution as many of the guys are suggesting. Its ridiculously toxic to aquatic life - so well away from water. You will probably need a set of small scales- cheap- on ebay to measure appropriate quantities. Local authorities are particularly fond of using it around the bottom of trees in parks etc
I am considering using a premixed product with similar ingredients called proshield this year - available from progreen. It seems expensive, until you realise it covers almost as much as 4 packs of chikara/paradise. My decision is based on bad experiences in 2018 with drought and weeds not "growing strongly" and the just never ending rain last year constantly resulting in repeat applications even when rain wasn't forecast.....My hope is that one application of proshield on a good weather day will illiminate repeat applications. That said glyphosate is so cheap and easy to deal with....