Hi Smeagal, the post you are thinking of was from Smithyveg who grows exhibition vegetables. Here it is:-
QUOTE FROM SMITHYVEG:- "Exhibition growers grow parsnips in old oil drums filled with sand. Holes are 'cored' out using a length of plastic piping and then finished off with a crow bar giving long conical holes. These holes are then filled with the grower's mix of compost, soil, sand and various nutrients and the seed sown into the top. We only grow 4 or 5 in each drum as we're trying to get the longest and biggest.
If growing just for the table fill your dustbin with a mixture of sieved compost and sand and sow your seed across the top, thinning when germinated."
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