Indian suppliers commonly state a shelf life of around 12 to 24 months for dehydrated onion and garlic, in unopened sealed packs stored cool and dry. That is a typical trade statement, not a guarantee. The real figure depends on the form, moisture at packing, packaging and how you store it.
Dehydrated onion and garlic do not usually spoil in a dangerous way when kept dry. What they lose over time is colour, aroma and flow. Shelf life is really the period during which they still meet your quality spec.
What changes over time
- Colour: slow browning, faster in warm or humid conditions.
- Aroma and pungency: volatile flavour compounds fade, especially in garlic.
- Flow: powders and granules pick up moisture and cake.
- Moisture: rises if liners are damaged or packs are opened and resealed badly.
- Infestation: possible in poor storage, especially for flakes and larger pieces.
- Odour pick-up: onion and garlic can absorb, and pass on, strong smells from other goods stored nearby.
Form makes a difference
Flakes and kibbled pieces keep better than powder because they have less exposed surface. Powder takes up moisture and loses aroma faster, and caking is the most common storage complaint. Garlic loses pungency over time, which matters if you buy it for strength, as discussed in what allicin or pungency dehydrated garlic should have.
What makes shelf life longer
- Low moisture at packing, within your spec and measured by an agreed method.
- Packing soon after drying and milling.
- Sealed polyethylene liners inside cartons or multiwall bags.
- Cool, dry warehouse storage, off the floor and away from walls.
- Keeping goods out of direct sun and heat in ports and depots.
- First in, first out stock rotation.
Ask for evidence
Ask the supplier how they set their shelf life statement. A good plant can show retained samples from past seasons or stability checks. Your own customers may also need a best before date with support behind it.
Put the manufacturing date and best before date on every carton, with the lot number. Keep retained samples from each shipment so you can compare at the end of shelf life if a complaint arrives. Store them in the same conditions as your stock, so the comparison is fair.
Planning purchases around shelf life
Because processing follows the fresh crop, it is tempting to book a full year's volume at once. That can work for flakes, but for powders it is often better to book the raw material price and have the plant mill and ship in stages. Seasonal booking is explained in forward or seasonal price booking.
How Creston & Co handles this
We check packing dates, moisture and liner sealing at loading so the shelf life clock starts on goods that are in spec. We can also arrange staged milling and shipment from one booked lot. Begin with a free sourcing review.