Wrap coriander leaves in aluminium foil: Why more people are doing this to keep it fresh

Plastic traps moisture and ethylene gas together against the celery, creating a damp, stale environment. According to a peer reviewed study in Postharvest Biology and Technology, ethylene exposure accelerates chlorophyll breakdown and surface yellowing in celery, speeding up spoilage significantly. Foil handles both problems differently.

Aluminium foil is not fully airtight. Small gaps at the folds let excess moisture and ethylene escape slowly, while still keeping the celery from drying out completely. This creates a stable microclimate, cool and just humid enough, that plastic simply cannot replicate. It is basic physics working in your favour.

Each celery stalk is made of water-filled cells under pressure. That internal pressure is what gives it the snap. When moisture escapes too fast, cells lose pressure and the stalk goes limp. The UC Davis Postharvest Technology Center confirms that controlling moisture loss is the single most important factor in maintaining celery quality after harvest.

Do not wash celery before wrapping. Wrap the bunch snugly in foil with the ends slightly open, not fully sealed. Store it in the crisper drawer, away from apples, bananas, or tomatoes, which release ethylene and accelerate aging nearby. A small gap at each end is the key detail most people miss.

Properly wrapped in foil and stored at 0 to 2 degrees Celsius, celery can retain good quality for three to four weeks. The UC Davis Postharvest Center research notes that at optimum conditions, celery stored correctly can last five to seven weeks, far beyond what most households manage with plastic bags or loose storage.

Keep foil-wrapped celery in the crisper drawer, not on a shelf near the door. Door temperatures fluctuate every time the fridge opens, pushing moisture in and out of the plant cells repeatedly. The crisper maintains steadier humidity and temperature, which works together with the foil to extend crispness meaningfully.

Foil is not fully hands-off. Open the wrap once a week and remove any damaged or yellowing stalks immediately. Decaying stalks release gases that accelerate spoilage in healthy ones nearby. According to PMC research on ethylene management in produce storage, accumulation of ethylene in the packaging environment is a key driver of accelerated deterioration in fresh vegetables.
(Disclaimer: This story is for educational purposes alone and should not be considered as professional medical advice and does not substitute any medical advice.)