A new(ish) customer has Field Horsetails (Equisetum arvense) growing all around her garden in clustered spots, except for her lawn (they don't like being mowed). Have read a lot about their history, habits and compostion and know that most weedkillers simply drip straight off them, unless they're 'bruised' first. Easier said than done when there's hundreds of the damn stems sprouting up all over the place. But they are seriously out of control and were sprayed with Kaskara last Autumn. Kaskara composes of 200g/litre (19.34% w/w) 2,4-D acid equiv, as the ethyl hexyl ester, 85 g/litre (8.22%w/w) dicamba and 65 g/litre (6.29% w/w) triclopyr acid equiv. as the butoxethyl ester formulated as an emulsifiable concentrate. Basically, this weedkiller was formulated to kill Horsetails as the acids dissolve the silica coating and target the rhizomes, yet it is selective and doesn't harm grass unless over-mixed. Been for a visit today (very stupidly didn't take any pics - but will). The buds are about 3 inches high, rhizomes have crept over concrete (WTF!!!) and have smashed through the mortar mix between the paving. Looks like this is gonna be a war of attrition. There's not point in trying to dig it out anyway as the roots can go down several metres. Has anybody else had a long-standing battle with this horrendous wildlflower/weed and what did you use to finish it off.. and how long did it take?