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I wouldnt put them in buckets theyll overbalance and blow over. Each plant grows many thick stems and gets very topheavy up to 10 feet. For cooking soup, mash, bake, roast.
I usually harvest mine from October to January. I find them quite easy to dig out , then I replant a few tubers for the next year. Got the original ones from freecycle.They are quite fiddly to clean and peel and a lot of people won't touch them because they cause flatulence,but I don't find them too bad (cabbages are worse!) and find the easiest thing to do with them is make soup. Check on search- we've had a few threads about them before.
the tuber does give more AIR, then again Brussels sprout do to.