Visiting the channel islands years ago gave jude and I some great info on revitalising old dirt on the plot,of course then we lived at heathrow so collecting seaweed was a chore,now we live 20 mins from Poole Harbour im a frequent visitor as the harbour holds loads of weed passing through so Gazza just collects plenty of bladderwrack and I lay it on the potato plants and allow mother nature to break it up over the growing season,bags need a bit more care so I allow the weed to break up in a bucket into a soft mess....only don't get too close as it stinks to high heaven....I turn the dirt out of the bags and check for any old weeds,reload it and once the new tatters have appeared above ground I put some of the seaweed slurry around them.........works fine ......of course seaweed Tea is whats left over in the bucket I then filter through judes old tights...........don't tell her or she,ll kill me..........once done I pour it over my tommies once a week after the first trusses are set.
anyway the seaweed has worked for centuries for the channel islanders on their spuds so good enough for me.
GazNjude