When to Harvest Reishi (and What We Can't Say on Drying)

Harvest reishi when the margin of the cap turns from white to red, and take it by twisting or cutting at the base of the stem. That is Oregon State Extension’s guidance, and it is the one harvest sign our sources give. This page is part of our reishi growing guide. We came looking for drying advice, since people search for it, and found none in the extension material we used, so we say that plainly below instead of inventing a method.

How to tell when it is ready

Look at the edge of the cap. A growing reishi shelf has a pale margin, and Oregon State says it is ready once that margin turns from white to red. Check the margin rather than the size or the calendar.

Our sources describe no other sign. They give no photo guide to colors, and they do not say what happens if you wait past the red margin. We would rather leave that visible than guess at a warning sign. If your block’s maker gives its own cue, put it next to Oregon State’s.

This applies to the shelf form. Reishi can also appear as finger-like antlers, depending on oxygen (OSU), and our sources give no harvest sign for antlers. In Oregon State’s block timeline the antlers are a stage on the way to the shelf, not the point of harvest.

How to pick it

Oregon State says to twist or cut at the base of the stem. It gives no tool, no height to cut at and no handling advice, so keep to that one line.

How long it takes to get there

The timings are not a promise. Oregon State says reishi is slower to form mature mushrooms than shiitake, oyster or lion’s mane whatever the substrate, and the three log figures above come from different passages and measure slightly different things.

Flushes and how long a log lasts

Oregon State says natural logs and fruiting blocks can produce mushrooms twice a growing season, generally between April and August. Oregon State also says yields typically last one year for every 1 inch in diameter of the host log, so a log with a 6-inch diameter will bear fruit for about six years. The University of Kentucky says well-maintained logs can keep producing for at least three to five years.

We found no yield in grams or ounces for reishi, so we cannot tell you what a flush weighs. If you have grown reishi and want to tell us what you got, our contact page is open to corrections.

Drying and storing reishi

This is the gap. People search for how to dry reishi, and we looked. The extension documents we used, from Oregon State, the University of Kentucky, Cornell and UF/IFAS, give no drying temperature, no drying time, no storage method and no shelf life for reishi.

So this guide gives no method. A guess would look like advice and could mislead you. When we find an authoritative source, we will add it and update the date on this page. Until then, the only handling instruction we can stand behind is the one above: twist or cut at the base of the stem.

After harvesting

Our sources do not describe a rest period, a soak or a watering routine between flushes for reishi, and they do not say how long to wait after the first flush. For general log care, see our logs guide, keeping in mind it was written around shiitake.

What our sources do not tell you

We found no extension source for what over-mature reishi looks like, a harvest sign for the antler form, a yield in weight, or any drying or storage method. The 20, 28 and 75–90 day block timings, the three months from pinning to harvest, the log yield duration and the log timings all come from Oregon State, and the outdoor timing from Kentucky. If you are deciding whether to grow reishi at all, the pillar guide sets out blocks versus logs, and the kit page explains the block route.