Buying, Storing and Grinding Spices: Freshness, Shelf Life and Quality

Whole or ground: which to buy

A whole spice is still sealed in its seed, berry, bark or pod. A ground spice has been cracked open, so its aroma oils meet the air. An extension group in California says whole spices keep longest because they have not been cracked or ground, and it suggests buying whole for strength and shelf life. [4] A Florida extension guide lists whole spices such as cinnamon sticks and peppercorns as lasting up to about five years, ground spices such as paprika, cinnamon and nutmeg about two to three years, and large-flake dried herbs about one to three years. [2]

Those numbers differ between sources, so treat them as rough guides. The California group gives one year for ground spices and three years for whole ones. [4] North Dakota State University gives about three years for unopened ground spices and four for unopened whole spices such as cloves, but about one year for either once opened. [3] Florida's guide adds a useful point: dried herbs and spices never truly spoil, but their flavor and aroma fade. [2]

A trade-off: ground spice saves time, and whole spice gives more flavor but needs a grinder. For nutmeg, an Oregon State Extension guide simply says to buy it whole and grind or grate it. [5]

How to tell if a spice is still fresh

There is no test that gives a date. The sources we read suggest looking, smelling and tasting:

• Smell and taste. Smell or taste a pinch. If the aroma is weak, the flavor is weak too. [3]
• Color. Faded color can mean faded flavor. [3] Sunlight harms color, flavor and texture. [1]
• Clumps. A Florida extension article says caked spices should be thrown away, because caking usually means moisture or insects got in. [1]
• Rancid smell or insects. These can signal a food safety problem. A spice that is only past its "use-by" date is usually still safe but weaker. [1]

An Oregon State guide suggests comparing cinnamon from an old jar with a fresh bottle of the same brand: the old jar may still smell spicy, but the difference in taste can be surprising. [5]

How to store spices

Heat, light, air and moisture are the enemies. [4]

• Keep spices in airtight containers in a cool, dark, dry place. Glass jars with tight lids work well in a cupboard; tins block sunlight. [4]
• Keep them away from the stove, oven and dishwasher, because heat and moisture reduce potency. [3] Avoid cupboards above heating elements. [4]
• Do not open a jar over a steaming pot, and keep measuring spoons dry. [3]
• Extension advice on the fridge and freezer is split. Florida says not to refrigerate dried spices, since they take up moisture and clump, but says frozen opened spices in airtight containers can last longer. [1] North Dakota State and the California group advise against freezing unless the container is well sealed against moisture. [3][4] If you freeze, seal tightly and open only when the jar has come to room temperature (our own common-sense note, not from a source).

Toasting and grinding at home

Oregon State Extension describes the method: put whole spices in a small dry skillet on medium heat, stir constantly so they do not scorch, and toast until fragrant and a shade darker, about 3 to 5 minutes. Cool them a little before grinding. [5] The same guide says to "bloom" ground spices by cooking them for a minute or two in oil or ghee before adding liquid. [5]

For grinding, the guide calls a coffee grinder the best home tool and suggests keeping one for coffee and a separate one for spices. Wipe it with a brush or cloth to clean it. [5] It also quotes a magazine test noting that heat from industrial grinding can destroy much of cinnamon's aroma, and that some companies use a cold process. [5] The sources we read do not give exact times for each spice, so watch and smell as you go.

What happens at the factory: steam, irradiation and organic

Spices are dried plant products that often come from far away and are sometimes eaten without further cooking. Factories therefore often treat them to reduce germs. A 2018 research paper lists chemical fumigation, irradiation and steam as current industry practices. [8] The paper tested a vacuum-steam method and found shorter, cooler treatment than dry heat and smaller losses of aroma compounds. In one test, whole peppercorns kept their look but a taste panel noticed a smell difference, while cumin seeds showed no smell difference. [8]

The US Food and Drug Administration (FDA) says spices and seasonings are approved for irradiation. Irradiated food carries the Radura symbol and a "treated with radiation" statement, though spices used as an ingredient in a multi-ingredient food do not need their own label. FDA says irradiation does not make food radioactive. [6] If you want to avoid it, USDA organic rules do not allow ionizing radiation, according to OMRI, which cites section 205.105(f) of the US organic rule and the FDA irradiation rule that covers spices. [7] We did not find a USDA page that states this for spices alone.

Contamination and fake additions: what the sources say

Germs. An FDA risk profile was written because of evidence that controls on spice safety might not be working well. [13] A 2018 paper reports that about 6.6% of spice containers offered for US import (187 of 2,844) were contaminated with Salmonella. [8] A published review of outbreaks (listed by FDA) covers 1973 to 2010, but we did not open its full text. [13]

Lead. In 2023, children were poisoned by cinnamon applesauce pouches. FDA found up to 5,110 parts per million of lead in cinnamon from the maker, and later confirmed the source was lead chromate. FDA's leading idea is that it was added on purpose to raise the weight and color value. [10] In 2024 FDA tested 75 retail ground cinnamon samples. Lead in the flagged ones was 2 to 3.4 ppm, far lower than in the pouch cinnamon, and FDA advised against buying the six brands named in its alert. [9] A 2024 study of 480 samples of 13 dried herbs and spices in Lebanon found that 20% of pooled samples were over the Codex lead limit of 0.3 mg/kg, with the highest rate in unpackaged (bulk) spices. [11] This is one country's study, not a statement about all spices.

Illegal dyes. Sudan dyes are industrial colors not permitted in food. A trade-press article names chili powder, paprika and curry among the spices where they have turned up, and says the European alert system logged 429 notices for herbs and spices as of 2017. [12] It cites the cancer agency IARC as saying they may be genotoxic or carcinogenic. [12] We did not open an EU or IARC primary document for this, so treat it as a lead to check.

What you can do

• Check recall notices before buying a new brand of ground cinnamon, and do not use products named in an FDA alert. [9]
• Buy from sellers with steady turnover, in sealed packaging, rather than loose bulk bins. This follows the Lebanon finding that unpackaged spices had the highest rates, but it is one study. [11]
• If you think a child ate a listed product, talk to a health care provider. FDA also notes that enough iron, zinc and calcium in the diet can reduce how much lead the body absorbs. [9]
• Do not use clumped, rancid or insect-affected spices. [1]

Which spices are sold whole