Picture posting is enabled for all :)
I read a while back that growing turnips on the area would kill horsetail - this is not an old wives' tale - it was supposed to be first-hand experience.Unfortunately I can't remember where I read it - though I'm pretty sure the intention was to get a usable crop of turnips into the bargain - so I assume they would have fertilised the soil first (which might put the horsetail at a disadvantage straight off...).Cheers.
I heard it from Mr Yeoman/Village Guild and the turnips were supposed to get the better of couch grass, if I remember right.