How to Store Pu-erh Tea at Home (and Build a Simple Pumidor)

Store pu-erh somewhere dark, odour-free and stable, at roughly 60–70% relative humidity and 20–30 °C (68–86 °F), with some air circulation. Keep the cakes in their paper wrappers, away from the kitchen and anything with a smell, and don't seal them airtight if you want them to age. If you only plan to drink the tea within a year or two, almost any closed box in a cupboard is fine.

The details matter only if you want your sheng to actually change over the years, and that's where most home storage goes wrong.

My first cakes lived on an open shelf in the living room, next to a radiator. In winter, central heating took the air down to around 35–40% humidity, and after two years the sheng hadn't aged, it had just gone flat: thinner, duller, the fruit gone. Friends in drier climates told me the same story. Since I moved everything into a simple closed box with a humidity pack and a cheap hygrometer, the same kind of cakes have kept their life and slowly deepened. It cost less than one good cake.

The five things that matter#

Pu-erh, especially sheng, keeps changing after it's pressed. Microbes, oxygen and moisture slowly transform the leaf: bitterness softens, fruit and floral notes turn into wood, dried fruit and camphor. Good storage keeps that process going gently. Bad storage either stops it or sends it in the wrong direction.

The exact numbers vary from source to source, and people in Hong Kong, Kunming and Malaysia age tea very differently. But almost everyone agrees on the direction: a steady middle, rather than extremes.

Humidity#

This is the factor most people outside Asia get wrong, because indoor air in Europe and North America is often 30–50% RH, especially in winter. An inexpensive digital hygrometer tells you where you stand. If your room sits below 55% for most of the year, you'll want a closed container with a humidity source (see the pumidor below).

Temperature#

Warmth speeds aging; cold slows it down. What matters most is stability. A cupboard on an inside wall is better than a shelf by the window, where sun and night temperatures swing the tea back and forth.

Air#

Pu-erh doesn't need a breeze, but it does need some air circulation: without it, even old tea turns flat. If you keep it in a closed box, open it and let it air every week or two. The old advice to store cakes in open air works in humid Hong Kong; in a dry apartment, it just dries them out.

Odours#

Tea is an excellent odour absorber, and the smell doesn't come out. Keep pu-erh away from kitchens, spices, coffee, cleaning products, scented candles, freshly painted furniture and camphor wood. Skip plastic containers: plastic has its own smell. Even a new wooden box should air out for a few days first.

Light#

Keep the tea in the dark: a cupboard, a closed box, or at least out of direct sun.

Storage options compared#

For most people outside humid Asia, the pumidor is the best answer. Here's how I built mine.

How to build a simple pumidor#

A "pumidor" (pu-erh + humidor) is just a closed container where you control humidity. Mine took twenty minutes and cost less than one good cake.

You'll need:

• A wooden box with a lid, or a large clay crock, big enough for your cakes plus some air (a 30–50 litre box holds 15–30 cakes standing on edge). Not plastic: it has its own smell, and the tea picks it up
• A digital hygrometer, ideally one you can calibrate
• Two-way humidity packs: 65% or 69% work well for pu-erh (Boveda is the common brand)
• Optional: a cardboard box or paper lining inside, and a divider to keep sheng and shou apart

Steps:

1. Air out the box. Wipe it clean, then leave it open for a few days until it smells of nothing.
2. Line it (optional). Cardboard or plain paper buffers humidity.
3. Load the cakes. Keep them in their wrappers. Stand them on edge like books so air can move between them.
4. Add the humidity packs. Start with roughly one 60 g pack per 8–10 litres of box, placed on top of the cakes, not under them.
5. Add the hygrometer and close the lid.
6. Wait a week, then check. The reading should settle between 60 and 70%. Too dry: add another pack. Too damp: remove one or open the lid for a few hours.
7. Check monthly. Swap packs when they go hard and crunchy. Every week or two, leave the lid open for a while: pu-erh needs some air circulation.

If your room is already 60–70% most of the year, you can skip the humidity packs and just use a cardboard box in a cupboard.

Sheng vs shou: store them differently#

Sheng is the tea you're really storing for. It needs humidity and time to age, so it goes in the pumidor. Keep it away from shou, because ripe tea's earthy smell can drift into raw tea.

Shou is already fermented and changes more slowly than sheng: it loses its "pile taste" in the first few years and keeps developing well past ten. It's less fussy: a cardboard box in a cupboard is enough. If a fresh shou smells fishy or musty, let it air out in a paper bag for a few weeks before sealing it away. Not sure which is which? Read sheng vs shou pu-erh.

Tea for drinking vs tea for aging#

Most home collections have two parts:

• The drinking stash: the cakes you're working through now. Break one up with a pu-erh knife, keep the pieces in a small clay jar or a paper bag inside a tin, and aim to finish it within a few months. A few weeks of rest after breaking up a cake often improves it. See how to break a pu-erh cake.
• The aging stash: whole cakes in wrappers, in the pumidor, left alone. Taste one every year or two to follow how it's developing.

Mould vs bloom: what's on my tea?#

Occasionally you'll find something on a stored cake. Here's how to tell what it is:

When in doubt, throw it out. Mould is almost always a sign the box was too wet for too long, often above 80% or with packs placed directly against the tea.

Common storage mistakes#

• Open shelves in heated rooms. The most common reason sheng goes flat outside Asia.
• Storing near the kitchen. Cooking smells end up in the cup.
• Vacuum-sealing tea you want to age. It preserves the tea as it is but stops it from developing.
• Humidity packs touching the cakes. Local dampness is how mould starts.
• Never checking. A hygrometer and a monthly glance prevent almost every problem.
• Mixing sheng, shou and flavoured teas in one box.

For more on pu-erh, see the complete pu-erh guide and how long pu-erh can age.

Read next: the best places to buy pu-erh online.