Comfrey

[ceres]

I don't think it would work as well in pots.  I think the idea is that the tap roots go very deep and capture nutrients and trace minerals out of the reach of other plants.

I don't find it difficult to control at all.  I've got Bocking 14 so it doesn't self seed.  It's planted along the back of the shed and although it flops over a bit, it could be easily tidied up with a few canes and string.  It's not really there long enough to be a problem.  Like Growmore I take the shears to it as soon as it's looking like it needs cropping.

[ceres]