Interesting subject: but I wonder whether on the Goyt, you could ever be very successful. The high spates we often get are a problem, but the amount of debris, trees, branches, gravel, bricks etc moving downstream would probably wipe out much of any efforts made to stimulate weed growths.
You would probably have to choose planting areas very carefully, restricting them to those areas without masses of gravel transit during floods.

I think also that the tree-lined nature of much of the Goyt inhibits most streamer weed growth. Not enough light?

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