The four enemies
- Air — oxidation dulls color and eats sweetness first.
- Light — degrades chlorophyll; vivid green fades to olive.
- Heat — accelerates every kind of decline.
- Moisture — clumps the powder and invites off-aromas.
Simple rules that work
Keep matcha in its airtight, opaque tin, sealed immediately after each use. Store it in a cool, dark cupboard away from the stove, and always scoop with a dry spoon.
Because matcha absorbs aromas easily, keep it away from spices, coffee, and anything strongly scented.
Treat matcha like fresh herbs, not like a pantry staple.
Should it go in the fridge?
Unopened tins store well in the refrigerator for the long term. Once opened, refrigeration is a trade-off: every time a cold tin meets warm air, condensation threatens. If you refrigerate an opened tin, let it come fully to room temperature before opening.
For a tin you finish within a month, a cool dark cupboard is usually the safer, simpler choice.