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Unidentified plant
Can anyone identify this plant that appears every year in my lawn and between slabs? Any ideas on how to destroy them?

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My friend at the local gardening society got rid of his by simply vigilantly pulling it up on sight. It eventually gave up the ghost. I've heard of other people covering the affected area with tarp or weed membrane for a few years. You could also treat with glyphosate, but you'd have to damage the plant by crushing it underfoot before applying the glyphosate because horsetail doesn't abosrb very easily as it's tough as old boots.
The only solution is ammonium sulphamate and KG’s of it, but that will kill the lawn and any other plant it touches.
Mix 1KG in 1ltr of water with some washing up liquid in a pressure sprayer, spray anywhere that Marestail is growing. Wait 2 weeks and spray the whole area again, wait 2 more weeks and spray any new growth. After that you can ‘spot’ treat and stray bits that show up by making a paste with the above ratios and adding wallpaper paste.
Nothing should be planted in the area for at least 8 weeks.
Ammonium sulphamate breaksdown into ammonium sulphate ( a great fertilizer )