A Shiitake log growing kit turns one freshly cut hardwood log into a mushroom crop that returns year after year. You drill the log, tap in 30 inoculated plugs, seal them with the beeswax supplied, and stand the log in shade. Colonisation takes 12 to 18 months. After that the same log fruits for three to five years.

Shiitake is chosen from the variety dropdown on the outdoor mushroom log growing kits page. Order more than two of the same variety and the price falls to £8.00 each, which is what most people do once they realise one log is rarely enough. If waiting a year does not appeal, the Shiitake ready growing kit fruits indoors in days.

How is the outdoor log kit different from the indoor Shiitake kit?

Two products, same mushroom, completely different jobs.

The indoor kit arrives already colonised. You open it, cut the holes, mist it, and mushrooms appear within days. It crops two or three times over a few weeks, then it is finished.

The outdoor log kit is raw material. Nothing is colonised when it arrives. You are handing 30 plugs of live Shiitake mycelium a log and asking it to eat its way through the whole thing. That takes 12 to 18 months. In exchange you get a log that fruits every year for three to five years and asks almost nothing of you between flushes.

The indoor kit is a meal. The outdoor log is an orchard. Neither is better. If you are buying for someone who wants to see something happen, buy indoor. If you have a shady corner of the garden and the patience to forget about it for a winter, buy the log kit.

Why is Shiitake the classic log mushroom?

Because it evolved for exactly this. In the wild, Lentinula edodes lives on fallen hardwood in East Asia, breaking down dense wood most fungi struggle with. Log cultivation in Japan and China goes back centuries, originally by notching shii trees and standing them near a fruiting log to catch spores. The plug method is the same idea with the guesswork removed.

It is the most widely cultivated mushroom on logs in the world, for practical reasons. It colonises dense hardwood well. It shrugs off a British winter outdoors. It fruits in response to weather rather than daily attention. And it dries better than almost any other cultivated mushroom, which matters when a log gives you a whole flush in a week. Oyster varieties colonise faster, but nothing has a longer track record on logs.

Which hardwood logs suit Shiitake?

Oak first, always. Oak is dense, slow to break down, and gives the longest productive life from a single log. Beech is a close second. Birch, alder, ash and elm all work and colonise faster because the wood is softer, though they are spent sooner. Fruit woods are acceptable, apple especially.

Avoid softwoods and conifers entirely. Pine, spruce, larch, leylandii: none of them. The resins inhibit the mycelium and you will wait a year for nothing.

What log size and freshness do you need?

The log must be freshly cut hardwood. That is the single condition people get wrong. Use a log cut from a living tree between two and eight weeks before you inoculate. A log cut less than two weeks before can still hold anti-fungal compounds in the fresh wood that slow your plugs. A log left longer than eight weeks, or sitting in a woodpile since last summer, has already been colonised by whatever wild fungi found it first, so your Shiitake plugs end up competing rather than settling in.

Bark is the log's skin: it holds moisture in and competing spores out, so a log dragged across a yard and stripped of bark will dry out through the wounds. For size, aim for something you can still lift, roughly the diameter of your thigh or a little more. Too thin and it dries out before colonisation finishes. Too fat and it is simply hard work.

When should you cut and inoculate in the UK?

Cut in the dormant season, in late winter, when sap is down and the wood holds moisture without the sugars that attract competition. Then inoculate two to eight weeks later. Cut the log close to the day you plan to plug it, rather than felling in autumn and storing it, because a log left in the open for months is colonised long before your spawn goes in.

March and April are the sweet spot in most of Britain. Frost risk has passed and the mycelium gets a full season before winter. Autumn works too, though colonisation stalls over the cold months. If your log is ready and your kit is not, the plugs keep refrigerated for two to three months. Remember that it is the plugs you hold over, not the log.

What is the inoculation method, in short?

Drill, plug, seal, wait.

Drill 8mm holes about 5cm deep in a diamond pattern, spaced evenly along and around the log so the mycelium meets itself from several directions. Tap a plug into each hole until it sits just below the surface. Melt the beeswax and paint it over every plug and both cut ends. Wax keeps moisture in and contaminants out. Then stand the log in deep shade, off bare soil, somewhere rain reaches it.

That is the whole job. Full instructions come in every kit, and the guide to growing mushrooms on outdoor logs adds detail on siting and stacking. You supply a drill, an 8mm bit and something to melt wax in. An old saucepan or a tin in hot water both do.

What does a colonising Shiitake log look like month by month?

Months 1 to 3. Nothing to see. Under the wax, each plug is sending hyphae into the wood.

Months 4 to 8. The first honest sign. Bright white, slightly fuzzy mycelium appears on the cut ends, faint at first, then obvious. This is when most people relax.

Months 9 to 12. Bark begins to loosen at the ends. Tapping gives a duller sound than fresh wood. On birch or alder you may see fruiting attempts.

Months 12 to 18. Colonisation completes. The log feels lighter than it looks and white patches show under loose bark. From here it waits for a trigger, not for more time. Oak takes the long end of that range; birch and alder often finish nearer 12 months.

When does the first flush arrive, and what sets it off?

Once the log is fully colonised, Shiitake fruits in response to a shock rather than a schedule. Outdoors in Britain that usually means heavy rain after warm dry weather, most often in spring or autumn. Pins appear through the bark within a week of the trigger and size up over the following five to seven days.

To prompt a flush, soak the log: fully submerged in cold water for 24 hours, weighted down, then stood back up. The cold shock plus rehydration mimics autumn rain. Most people try this once a log has had its full 18 months and still has not fruited. Never soak a log that has not finished colonising. You will exhaust it before it has built reserves.

What is the cropping rhythm over three to five years?

After the first flush, a Shiitake log settles into a pattern. It fruits in spring and autumn when the weather turns, rests through the coldest months and the driest weeks of summer, and gives more per flush as the mycelium finishes claiming the wood. Years two and three are usually strongest. By year four or five the log softens, flushes thin, and the wood crumbles. That is not failure. That is a log completely eaten, which is what you paid for.

This is why people rarely stop at one. A log inoculated every spring gives you a staggered set: one just starting, one in its prime, one winding down. At £8.00 each when you order more than 2 of the same variety from the log inoculation range, that rotation is not expensive.

Worked example: one oak log, cut in February

Sarah in Hampshire has an oak limb come down in a January storm.

Early February. She cuts a section roughly 90cm long and a good 20cm across, bark intact, and stacks it off the ground under a hedge.

Late February. She orders a Shiitake log kit and puts the plugs straight in the fridge. Good for two to three months, so no pressure.

Mid March. A dry weekend, about six weeks after felling. She drills 8mm holes 5cm deep in staggered rows, taps in all 30 plugs, melts the beeswax in a tin standing in boiled water and paints over every plug and both cut ends. Under two hours.

Late March. The log stands on two bricks in the shade of the north fence, where rain reaches it but full sun never does.

June. Nothing visible. She worries slightly, does nothing.

October. Faint white bloom on the top cut end. First real evidence.

Following March. Mycelium clearly visible under the bark at both ends. Twelve months in.

Following September. Three days of hard rain after a warm dry fortnight. Eight days later, pins push through the bark on the shaded side. She picks the first Shiitake nineteen months after she drilled it, and the log fruits every spring and autumn for the next four years.

Worked example: a household that bought both

The Prices in Leeds wanted Shiitake for cooking and had a birthday in three weeks. They looked at the log kit first: shaded side return, and Dan's father could supply a beech log. But 12 to 18 months to first fruiting meant nothing on the table in time.

So they bought both. The indoor Shiitake ready growing kit at £18.95 went on the kitchen windowsill and gave them mushrooms within weeks, plus a second flush after. The log kit went into the beech the following March.

Their reasoning was sound. The indoor kit taught them what Shiitake looks like at the right picking stage, which made reading the log far easier a year later. Under thirty pounds for both, and the log is now in its third cropping year. To split across varieties, the three kit bundle at £40.46 covers the indoor side.

How do you know when to pick, and what happens if you leave it?

Pick when the cap has opened out but the edge still curls under. Firm, dense, deeply flavoured.

Left too long, the cap flattens, then turns up at the rim like a shallow bowl. Gills brown, texture turns papery, and it starts dropping spores. Still edible, but it has lost what made it worth growing.

Twist and pull off the bark rather than cutting, so you leave no stub to rot. Work through a flush over two or three days. Shiitake stems are tough, so trim them off and keep them for stock.

Cooking and drying a Shiitake harvest

Shiitake wants heat and time. Dry pan first to drive off water, then add fat. Underdone Shiitake is rubbery, which puts off more people than any other mistake. Our guide to cooking shiitake mushrooms covers the technique.

A log flush arrives all at once, so drying is worth learning. Shiitake dries better than any other cultivated mushroom and gains flavour doing it. Sliced and dried, it keeps for a year in a sealed jar and rehydrates in twenty minutes. The home drying guide covers oven, dehydrator and airing cupboard methods.

Frequently asked questions

Ready to start a Shiitake log?

One kit of 30 plugs suits one log, so order a kit per log rather than spreading plugs thin. Your 30 plugs, beeswax and instructions arrive ready for the fridge until your log and the weather are. The range also covers White Oyster, Lion's Mane, Tarragon Oyster (Native), Golden Enoki, Summer Oyster (Native) and Turkey Tail (UK Native) if you want logs fruiting at different times. Six generations of growing in West Sussex behind all of it, and we are glad to answer questions.