One of Kim's New Year resolutions over at A Study In Contrasts is to store more of her garden grown crops and she's asked what I was referring to when I wrote that I'd dug up my Christmas potatoes from a 'clamp'.
There is a well illustrated explanation over at Self Sufficientish.
To store suitable vegetables (potatoes, carrots, beets, celeriac, Swedes) growers dug a trench in a dry,well drained postion, lined it with sand or straw and then covered this with a single layer of carrots or potatoes or other suitable crop. Over this would go a layer of straw then another layer of crops and so on until a large cone formed. A hole was made in the top for ventilation and the cone covered with the soil from the trench - so it was essentially waterproofed. The crops were dug out as needed.
My own method is an adaption on this - much less labour intensive and on a much smaller scale! Get a large plastic box with a snap shut lid, line with damp, not wet, sand and lay a single layer of potatoes (blemish free ones only), then sand, then potatoes and so on finishing with a layer of sand. Seal the lid, dig a hole in the garden, bury the box about a spade deep, mark it (!) with a stake, dig it up at Christmas. This way I've had perfectly preserved Charlotte potatoes on Christmas Day. Its a second early salad type, which I've not been able to store well in bags much later than November, but the clamp works really well.
This year I couldn't find a suitable box so I used two plastic grocery bags, filled these with sand and spuds, wrapped the bag in foil to waterproof it (often grocery bags have holes) and buried it as before.
Because my soil is free draining and winter temperatures here seldom get below zero for any length of time, I leave my leeks, parsnips and carrots in the ground, harvesting as I need them but using them up before they start to regrow in Spring.
But if Kim is to store more she'll have to keep an eye on the canine competition!
I blamed overnight strawberry losses on mice only to find the culprit was a Springer Spaniel; cherry tomatoes were snacked on by a Wheaten Terrier and I've heard of a German Shepherd who digs up his own carrots.
Well a dog like that would get away with it, wouldn't he?