Since moving to my home in 2008 each year the mare's tails have become difficult to treat. I have used gardeners to strim down the mare's tails but within days new growth appears. I have previously tried all the branded weed killers and not one has worked. Used this product on my block paving drive and on day 2 the weeds had discoloured and started to wither. On day 5 the weeds again had shrunk in size, green colour had gone and they were obviously dying. The gardener returned after 2 weeks by which time weeds were brushing off with his boots. He swept them up with a broom and he may have used a strimmer to neaten off. That day he also applied another application and since then I have not seen new growth. He used 30ml on day 1 and 2 weeks later applied another 30 ml. It is now 3 weeks since application 2 and no new growth. He used it with a boom sprayer as directed. We are monitoring this and perhaps in another couple of weeks we may apply a 3rd application of 30ml as I do not want the weeds to grow again. This is THE BEST and EFFECTIVE WEEDKILLER which ACTUALLY WORKS. It is worth the price as it is such a good product.