A Spare Corner Keeps Your Harvest Till Spring With These
You do not need a hobbit door in a hillside - a cold corner, the right containers and a thermometer store ten bushels till spring. The cellar is a set of conditions, not a room.

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A min-max thermometer
The cellar is a number: 32 to 40
Root crops keep at 32-40F and rot at 50, and a corner that feels cold at noon may spend nights above the line - you cannot feel a five-degree drift, and the min-max memory catches what you sleep through. Find the corner that holds the number: usually against the north foundation wall, floor level, away from the furnace.
High humidity is the second half - dry cellars shrivel carrots; the hygrometer half tells you.
Slatted wood crates
Plastic totes sweat; wood breathes
Vegetables in a sealed tote fog it with their own breath and rot in the puddle. Slatted crates keep air moving through the pile, stack a wall of storage in a single corner footprint, and let you inspect without unpacking. One crop per crate - the apples get their own corner entirely.
Apples breathe ethylene that sprouts potatoes - keep them far apart.
A bag of damp sand
Carrots keep five months buried
Carrots and beets go rubbery in dry air within weeks - their five-month trick is burial in barely-damp sand, layered like archaeology in a crate. The sand holds them at high humidity without rot, and January carrots come out snapping like October. Cheapest storage upgrade in the whole system.
Barely damp: it should clump, not drip. Trim tops to a stub first.
Breathing burlap sacks
Potatoes want dark lungs
Light greens potatoes toxic, plastic sweats them rotten - the potato's container must be dark AND breathing, which is a burlap sack exactly. Fifty pounds keeps firm into April somewhere cold, and the sacks fold flat between harvests or become frost blankets in a pinch.
Cure spuds two weeks somewhere dark first; fresh-dug skins are too thin to keep.
An adjustable vent
Cold air is the equipment
A storage corner warms up from the house side and the fix is free cold air, admitted on purpose - a basement window cracked behind a baffle, or a simple adjustable register in the partition you boxed the corner with. Open on cold nights, shut in a deep freeze: that is the whole thermostat.
The insulated-corner build is a weekend of rigid foam - the vent is the part you buy.
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