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The washing up liquid is to help it stick to the leaves-it may harm an annual weed but is never going to work on perennial weeds like thistles ,bindweed brambles etc
2 choices dig it out-hard work- and you need to get it all out- or use a glyphosate based weed like like Roundup-it becomes inactive on reaching the soil and will not harm wildlife
Ok it is a chemical -the world is made up of chemicals-as is vinegar- used properly it is safe -tough problems call for tough measures.
I have to agree with sotongeoff. I am trying my best to be organic and have spent a lot of time hand-weeding our garden. I have hand dug, sieved, applied cardboard mulch, you name it.
A local landscape gardener who is organic-friendly said that in his opinion there is NO alterative to spraying off the weeds on our gravel drive and under the fences etc. twice a year with glyphosphate. Having spent a year NOT doing that, I'm afraid to say i have to agree with him.
As regards lawn weeds, I recently bought one of those Fiskears gizmos for pulling out plantains, dandelions etc. and they seem to work quite well, but you will end up with a few holes which you might have to fill in.
I posted a question about this last week! I found a frugal website that suggested this, I am currently trialing it at the front of the house. Thus far the weeds are dead, however so is the surrounding lawn!
I have been using vinegar to treat weeds on our patio very successfully, i used malt vinegar without diluting (Lidl sell pint bottles for 17p!)
It has worked a treat, dealing with most perenials as well as anuals, even hit the horsetail for six which is saying something, though I expect to see that again next year. One application on a dry day does the trick for several months.
I don't think your landscaper friend can call him or herself 'organic friendly' if they are happy to use cancer causing chemical weed killers on a regular basis! Perhaps 'organic tolerant' may be a better description. Many people recommend the more safe and natural formula of vinegar with a little washing up liquid and for a deeper formula add some salt. I wouldn't recommend using the salt formula where you want other plants to grow though as it can damage the soil.
Sotongeoff, we are surrounded by chemicals yes, however some of them are extremely damaging to health. No long term studies have been done on the health effects of weed killers, but the ingredients are known carcinogens.
Everyone is overusing chemicals these days and no-one is seriously questioning why there is so much cancer.
Sorry if I've sounded off here but flippancy around these chemicals always annoys me.