I've just tried a tip I was given a couple of years ago by a dahlia grower/shower, I had grown some established tubers in pots this year and when I depotted them a few days ago the tubers were football sized! I was picking away at the compacted soil around them to little avail. SO remembering the tip I decided to give it ago. Using the hose and lance waterer I jetted the soil off, magic, it really worked. Obviously the jet of water wasn't too severe or it would have damaged them. They are now sat on the garden wall drying off all pristine and clean eating the next stage.
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