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Watch: How to Grow Mushroom Logs

Growing mushrooms on logs is very much like planting seeds in a raised bed. You make a hole in the soil (log), you plant the seed (plug spawn) and you seal the hole over (with wax instead of soil). Given the right  conditions (shade instead of sunlight) and good moisture, the roots (mycellium) will search out nutrients and when the plant (fungus) is ready, it will set fruit (mushrooms). This is definitely one of those projects where you can jump in feet first, but below are some detailed instructions to make sure you get it right.

Sow True Seed sells a Mushroom Log Starter Kit with drill piece, wax, paint brush, mushroom plugs and instructions. This can be a great way to get started.

LOG Selection: Logs must be cut from healthy living trees. NO ROT AT ALL! Plugging your logs must take place zero to two months from the date that the tree was felled, but the sooner the better. Best time of the year to cut is winter into spring when the trees are completely dormant.  However, you can inoculate at any time during the winter months. Cutting in the summer is not recommended but is still possible with oak species. Keep the bark undamaged and as intact as possible.  Keep the logs clean and off the ground by stacking on a crate or scraps of wood.

Mushroom Log Drilling. Credit - Megan Richardson

Log Type: Suitable wood species:  White Oak, Red Oak, Sweetgum, Ironwood, Maple, Tulip Poplar, River Birch, Cherry, Black Gum, Honey Locust, Black Walnut (lions mane only).   In general, oak is THE best.  NO black locust, apple, cedar, Osage Orange, OR PINE species. Hemlock will work for reishi and possibly shiitake, provided that it is fresh and free of rot. We highly recommend running all oysters on softer hardwoods like tulip poplar, and saving your oak for other species.

Mushroom Logging. Credit - Megan Richardson

LOG Prep: Soak your logs for 12-24 hours BEFORE plugging with spawn, but allow the bark to dry out before you plug them. This means starting the soak two days before you are going to plug them.  Note:  if the logs are less than a ten days old, soaking is not necessary.

LOG Drilling: Drill holes starting two inches from the end of the log and spacing approximately six inches apart.  Make the rows of holes three to four inches apart along the girth of each log.  For example, a four inch diameter log will have three or four rows of holes in a line, with each hole in the line six inches apart. Use 5/16 inch bit for plug spawn. Drill the holes 1 1/4 inch deep. Once you have inserted and tapped in the plugs, wax over with bees or soy wax immediately. Also wax over the ends of the logs, anywhere the bark was nicked or damaged, and anywhere that branches were cut off of the log.

LOG Storage: Criss-cross stack in full shade during the colonization period.  Keep your logs in full shade in a place with access to water.  Keep your logs outside in the elements and do not cover them. Let the rain fall on them.

Mushroom Log Waxing. Credit - Megan Richardson

DO NOT ALLOW THE LOGS TO DRY OUT! However, it is not necessary to soak the logs during the colonization period, unless it is exceedingly dry.  If necessary, a deep soaking is best.  This means 12-24 hours of rain, sprinkler, soaker hose or roll them into a stream, pond, kiddie pool, barrel, bath tub, watering trough, etc.  Note:  The chlorine in municipal water will not hurt the logs.  Make sure the bark dries out between soakings.  Remember, fewer deeper soakings are best.  DO NOT SOAK THE LOGS FOR LONGER THAN 24 HOURS!

SPAWN RUN:  Takes anywhere from four months to two years, depending on mushroom and wood species. Eg. Oyster on poplar- four-six months.Shiitake on White oak -12 months.Be patient…. keep your logs hydrated and they will eventually make mushrooms.  Look for the ends of the logs to turn white with mycelium after a soaking rain as a sign that the spawn run is nearly complete.  At this point, you can force your logs to fruit by soaking them for 24 hrs.

Extra Notes

1.        Oysters, Shiitake:  The easiest to fruit species; can be fruited above ground stacked in a pile or leaning against a fence or tree.  Soak, stack, harvest.  Soak, Stack, Harvest.  Keep in mind that the more often you force your logs to fruit the shorter their life expectancy is.  We recommend a 4-6 week resting period between forced fruitings.  Shiitake logs require vibrating to initiate a good flush.  Beat the ends with a baseball bat or rock after soaking, but avoid damaging the bark.

2.       Reishi, Lion’s Mane:   More of a challenge to fruit; half bury the logs either horizontally or vertically once the spawn run is nearly complete.  You can bury short sections in planters with potting soil.  This is especially effective for Reishi.  Reishi can also be fruited directly on the ground, without burying.

Special notes:  Providing shade.  North side of house (but not under the eaves, as it needs the rain) is excellent during the winter.  A simple piece of 80 percent shade cloth draped over the logs works well.  Or under the cover of bushes, evergreen trees, etc. The logs will get lighter in weight over time as the fungus eats the lignin and cellulose and converts it into mushrooms.  Eventually they will fall apart and be recycled into the earth.  A six inch white oak log inoculated with shiitake will produce for five to six years.  You can expect roughly a year of production per inch of diameter of log for oak, less for softer hardwoods like poplar.

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