Spinach is the vegetable in this range where the buyer’s specification has to work hardest, for three reasons that have nothing to do with each other. First, it is a nitrate accumulator, and frozen spinach carries its own maximum level in EU contaminants law, which makes nitrate a release parameter rather than a nice-to-have. Second, it grows close to the ground in sandy soils, so grit is a genuine and recurring defect that washing reduces but does not eliminate. Third, the product is sold in formats that are physically different from each other – loose chopped leaf, pressed portions, briquettes, whole leaf – and the format changes the drained weight, the yield and the way the buyer has to price it. Two offers on frozen spinach are almost never offers on the same thing.
Grades, cuts and calibration
Chopped spinach is the volume format: blanched leaf cut to a nominal size, frozen loose or pressed. Portions and briquettes are the retail and food service formats, produced by pressing chopped blanched spinach into moulded pieces, typically in the fifteen to thirty gram range for consumer portions and larger for catering, and they trade on portion weight accuracy as much as on the spinach itself. Whole leaf is a premium format where leaf integrity after thawing is the specification, and it costs more because it needs gentler handling throughout. Across all formats the numbers that matter are drained weight after a defined thaw, free water, grit and sand content, stalk and petiole fraction, and nitrate. Colour is specified as deep green, assessed against a reference: an olive or yellowish cast points at an over-run blanch or a slow freeze rather than at the field.
Seasonality and availability
Spinach has two Ukrainian windows, spring from April into June and autumn from September into November, because the crop bolts in summer heat and quality collapses when it does. Nitrate content is higher in low-light conditions, which makes the late autumn crop the one to watch on that parameter, and it is the reason a nitrate result belongs on the certificate of analysis for every lot rather than on a periodic basis. Product is supplied from cold store between windows. A buyer with a tight nitrate requirement should expect the supplier to select fields and harvest timing to meet it, and should expect that selection to be priced.
What the buyer checks at intake
- Core temperature between cartons on several pallets, with the reefer download read before acceptance if a reading is warm.
- Nitrate result for the specific lot, checked against the maximum level in Regulation (EU) 2023/915 for preserved, deep-frozen or frozen spinach and against any tighter buyer limit.
- Grit and sand by the agreed method on a defined sample weight. This is the defect that generates consumer complaints and it is not visible in a frozen block.
- Drained weight after a defined thaw, and free water, since both drive the real cost per usable kilogram.
- Portion or briquette weight on a counted sample where the format is portioned, against the declared nominal weight and its tolerance.
- Stalk and petiole fraction against the agreed tolerance, assessed after thawing.
- Colour against a retained reference, distinguishing field variation from blanch and freezing effects.
- Peroxidase test on the retained sample plus the blanch record for the production date.
Where it is used
Retail private label buys portions and briquettes in printed bags, where portion weight consistency and the absence of grit are the two things that decide whether the line survives its first year. Food service buys chopped bulk in ten kilogram cartons and cares about drained weight, because a case that yields less usable spinach after thawing costs more per portion regardless of the invoice price. Manufacturing takes chopped bulk for fillings, sauces, pastry and ready meals, and usually applies the tightest free water requirement, since excess water ruins a pastry filling. Baby food takes chopped or puree grades and applies the strictest nitrate expectation of any application, often well below the general maximum level, because infant food carries its own regulatory regime.
Standards and routes
Road reefer into Poland and onward to Germany, the Netherlands and France covers most volume, with spinach frequently shipped alongside other frozen vegetables in a mixed load. Plants are normally certified to BRCGS Food Safety or IFS Food with GLOBALG.A.P. at farm level, and buyers in the infant segment normally add their own nitrate and residue monitoring requirements.
