Frozen spinach

Frozen spinach is spinach that has been frozen. That means fresh spinach leaves are washed immediately after harvest, briefly blanched (i.e. briefly heated in hot water) and then quickly frozen. This preserves many vitamins, the green color and the mild taste. For you as a buyer this means: you get spinach that is almost as fresh as from the field, but long-lasting and super practical – it waits in the freezer until you need it.

Where does frozen spinach come from?
Spinach is grown in many countries with temperate climates. In Europe, large growing areas are for example Germany, the Netherlands, Belgium, Italy and Spain. Spinach is also grown in the USA, China and other regions. For frozen products, farms often work with processing facilities located close to the fields. This means little time passes between harvest and blast freezing. The process is usually as follows:

Through this process frozen spinach typically remains good for several months, often up to one to two years in the freezer. The exact date is printed on the package.

Why is frozen spinach almost always available?
Spinach is grown in several waves throughout the year, often in spring and autumn. Because it is processed and frozen so quickly, it can be sold year-round. Even when fields lie fallow in winter, frozen spinach remains in supermarkets because it was harvested and stored earlier. This is convenient for households, canteens and restaurants: you don't have to wait for the season and always have a portion of vegetables ready.

Types and varieties of frozen spinach
In the frozen aisle you will find different variants. They differ in form,

Frozen spinach refers to spinach that is processed, blanched and blast-frozen immediately after harvest. This preservation method retains color, aroma, nutritional profile and microbiological safety over an extended period. In food technology frozen spinach is regarded as a standardized ingredient with high process stability and defined particle size (leaf, chopped, portioned as cubes or nests). It is used in catering, mass catering and industrial formulations, particularly where consistent quality, low trimming loss and predictable sensory properties are required.

Botany and raw material basis: The source plant is Spinacia oleracea L. (family Amaranthaceae). Mostly smooth-leaf or semi-savoy varieties are used, characterized by high leaf mass, moderate oxalic acid content and good frost tolerance. Harvest windows in temperate climates are typically spring and autumn. For frozen processing whole young leaves or coarsely cut leaves are used; stem portions are usually reduced for texture reasons.

Technological processing:
1. Pre-cleaning: Removal of soil and foreign material using drum and jet systems, followed by multi-stage washing lines with turbulent flow.
2. Blanching: Short-term thermal treatment (typically 90–98 °C for 60–180 seconds) in water or steam blanchers to denature enzymes (e.g. polyphenol oxidase, peroxidase), fix color and reduce microbial load.
3. Cooling: Rapid cooling to <10 °C using ice water or air cooling to avoid carryover cooking.
4. Dewatering and portioning: Press or centrifugal dewatering; shaping into pellets, cubes or nests for dosable gram weights.
5. Blast freezing: Individual quick freezing (IQF) at –30 to –40 °C, core temperature ? –18 °C.
6. Packaging: Reduced-oxygen conditions, light-proof bags or cartons to minimize oxidation and vitamin degradation.