No, not a problem with nosy neighbours, but a creeping perennial, Soleirolia soleirolii (syn. Helxine soleirolii). It looks lovely in wall and patio crevices, spreading quickly to fill gaps, but regrows from the smallest sections of stem, and can be a nightmare to control once it gets into a lawn or borders. It forms dense bright green mats of foliage, and also has a golden form, with pretty white flowers in spring. So yes, it’s attractive, but don’t be fooled, its spread is described as ‘indefinite’ and you really, really don’t want it in your lawn!
If mind-your-own-business is widespread in your lawn, try feeding the lawn regularly to encourage strong lawn turf growth, to outcompete the weed. You can also lightly scarify the lawn several times in March and April, and again in September, as this will weaken the mind-your-own-business, and give the grass a chance to grow into the space.
Unfortunately, mind-your-own-business is resistant to all lawn weedkillers that are approved for garden use, so you can’t use a general weedkiller on it. You can use glyphosate with some success, particularly as a spot treatment, but you will need to be extremely careful as it will also kill your grass, and any surrounding plants too if it gets onto them. Glyphosate is sold as Scotts Roundup, Scotts Tumbleweed, Bayer Glyphosate Kills Weeds & Roots and Doff Knockdown Weedkiller, as well as a number of other brand names.
For best results, bruise the mind-your-own-business foliage lightly by walking on it before applying glyphosate, as this makes it more effective. Use a ready-to-use spray or gel for spot treatment (such as Roundup Gel), as this will be easier to target. If the weed is near shrubs and perennials, then shield them from the spray if possible.
As a last resort, if mind-your-own-business has really taken over your lawn, then treat it all over with glyphosate to make sure you kill all the weed, wait a few weeks and retreat if necessary, then buy turf and returf the whole lawn. Good quality turf from turf suppliers should not contain any weeds, so you should be safe from reinfection after that.
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