Pu-erh is one of very few teas that improve with time — but only when they are stored well. The good news is that you don’t need a special cellar. A cupboard and a little attention are enough.
The four enemies
- Light. Direct sun fades the leaf and breaks down aromatic compounds. Keep cakes in the dark.
- Smells. Pu-erh absorbs odours like a sponge. Not in the kitchen, not next to spices, coffee, perfume or cleaning products.
- Too much moisture. Above 75–80 % relative humidity, mould can appear.
- Too little moisture. In a very dry flat ageing almost stops and the tea turns flat. The usual culprits:
- radiators in winter;
- air conditioning in summer;
- a shelf right above the oven.
Ideal conditions
| Parameter | Ideal | Acceptable |
|---|---|---|
| Temperature | 20–25 °C | 15–30 °C, without sharp swings |
| Relative humidity | 60–70 % | 50–75 % |
| Light | Darkness | Diffused, never direct |
| Air | Still and odour-free | Occasional airing |
Wrappers and boxes
Leave the original paper wrapper on: it lets the cake breathe and protects it from dust. Several cakes of the same tea can be stacked into a tong and wrapped in bamboo leaf or paper. A cardboard box or an unglazed clay jar in a wardrobe is a perfect home.
Avoid sealed plastic for long periods. A zip bag is fine for a few months to protect the tea from smells, but over the years it needs a slow exchange of air.
Keep shu and sheng apart
Store ripe and raw pu-erh in separate boxes. Shu has a strong earthy aroma, and young sheng will happily absorb it.
A dry winter flat
If the hygrometer shows 30–40 % in winter, put a small dish of water or a humidity pack (62–65 %) inside the box, and check once a month. The aim is stability, not a tropical climate.
Keep tea the way you keep books you love: away from the sun, the stove and the bathroom.
Advice of an old Guangzhou tea merchant
Signs of trouble
White or grey fluffy spots?
That is mould. Unlike “frost” — fine pale crystals that sometimes appear on aged shu — mould is fluffy and smells musty. A mouldy cake should be thrown away.
A sharp or sour smell?
Usually a sign of too much humidity. Unwrap the cake, air it for a day in a dry room, then move it somewhere drier.
The tea seems to have lost its taste
Most likely it was too dry or had too much air. Put it in a box with other cakes of the same tea and give it a few months to wake up.
An open cake
A cake you are drinking from can live in a small clay caddy or a paper bag inside a tin. Break off a week’s worth at a time: freshly broken leaf has the brightest aroma, and a few days’ rest after breaking — xing cha, “waking the tea” — often makes it rounder.
How much to keep
For everyday drinking a few cakes are enough. If you want to watch a tea age, buy two of the same: open one now, leave the other untouched for five years, then compare. Young sheng from a good mountain rewards keeping the most; shu changes less, so buy it to drink.
And label every cake — the tea, the year, where and when you bought it. Tasting the same tea once a year is the best lesson in what ageing really does.
