Why Proper Curing Makes All the Difference

Home-grown onions and garlic are a joy, but they can turn disappointing quickly if they are not cured and stored properly. A bulb that is rushed from the soil to the kitchen shelf will often soften, sprout, or rot within weeks. Curing is the simple but vital process of drying the outer skins and sealing the necks so that the bulbs enter a natural dormancy. Get it right, and you can be cooking with your own onions and garlic well into spring. Get it wrong, and you will be composting a slimy mess by Christmas. The good news is that curing takes little effort, just patience and a warm, airy place.

Harvesting at the Right Moment

Timing is everything. Onions are ready when the tops have fallen over and begun to yellow, usually from late July to early September depending on variety and where you garden. Do not bend the tops over yourself to speed things up, as this can reduce storage life. Instead, wait until roughly half the tops have gone over naturally, then lift the bulbs with a fork on a dry day. Leave them on the surface of the soil for a few hours to let the sun and wind dry the roots, but bring them in before evening dew. Garlic is similar: harvest when the leaves are about half yellow and half green, before the bulbs split their skins. If you wait too long, the bulbs will shatter and will not keep. Use a fork rather than pulling, as pulling can damage the base plate, which is an open door to rot.

Drying and Curing Step by Step

Once lifted, move your onions and garlic to a warm, airy place out of direct sunlight. A greenhouse, a polytunnel, a covered porch, or a well-ventilated shed is ideal. The key is good air movement all around the bulbs. Lay them in single layers on wire racks, mesh trays, or old window screens. If space is tight, you can hang them in bunches, but make sure the bunches are small and not pressed together. Aim for a temperature of around 20–25°C (68–77°F) and low humidity. A fan can help on still, muggy days. Leave them for two to four weeks, until the skins are papery and rustle when you rub them, and the necks are completely dry and tight. The roots should look shrivelled. Some people trim the roots and tops at this point, but leave a short stub of neck to protect the bulb.

Plaiting, Hanging, and Storing

When your bulbs are properly cured, it is time to store them. For softneck garlic and onions, plaiting is traditional and space-efficient. Start with three bulbs, tie their necks together with string, then weave in more bulbs as you go, always adding to the outside. Alternatively, use nets, old tights, or mesh bags. Hang them in a cool, dark cupboard, pantry, or garage. The ideal storage conditions are 0–5°C (32–41°F) with moderate humidity, around 60–70%. Do not store them near apples, pears, or potatoes, which give off ethylene gas and encourage sprouting. Hardneck garlic does not plait well; store it in a single layer in a shallow box or in a net, and use it first, as it has a shorter shelf life. Check regularly and remove any bulbs that feel soft or show mould.

Keeping an Eye on Things Through Winter

Even with perfect curing, a few bulbs will let you down. Make a habit of inspecting your store every few weeks. Remove any that have sprouted, turned soft, or developed grey mould. One rotten bulb can quickly spread to its neighbours, especially in a closed cupboard. If you find that your onions are sprouting early, the storage place is probably too warm or too damp. Move them somewhere cooler if you can. If they are drying out and shrivelling, the air is too dry; a slightly more humid spot may help, but do not let them get wet. Use the thick-necked or damaged bulbs first, as they will not keep as long. Many smallholders also keep a "use first" basket in the kitchen, so nothing goes to waste.

Variety Matters, and a Few Final Pointers

Some onions and garlic are simply better keepers than others. Long-day onion varieties such as 'Sturon' or 'Red Baron' (red onions store less well than brown, but still worthwhile) are reliable. Softneck garlic varieties generally outlast hardnecks. Whichever you grow, remember that sound bulbs come from healthy plants. Avoid over-feeding with nitrogen late in the season, as this produces thick necks that will not dry properly. Water carefully in the final weeks so the bulbs do not split. And always handle them gently, as bruises become rot. With a little care, your harvest will reward you with months of home-grown flavour, and the satisfying rustle of a well-cured onion skin is one of the small pleasures of countryside living.