Log cultivation is usually done with logs 4 - 6 inches in diameter with a length of 3 to 4 feet. Oak is particularly good for the cultivation of most mushrooms though many other species work well also: poplar, aspen, sugar maple, willow, alder and birch, among others. Approximately 100 plugs are needed to inoculate 3 logs. Spawn can stay viable for up to 6 months in a refrigerator.

Tree species to avoid include many of the conifers, eucalyptus, hackberry, beech and dogwood. For certain mushroom species such  Reishi, hemlock, fir, and spruce can be used.

The best times for cutting the logs are either in the winter months for spring inoculation or after July 15 for mid-summer or fall inoculation. When inoculating logs in the summer, it is best to do the inoculation in the morning in a shady place. When selecting logs for mushroom cultivation, choose living trees without signs of decay. If the tree is dead, it will certainly already have other fungi growing in the wood.

Using logs from a dead or unhealthy tree will either lower your yields or prevent production altogether. It is best to inoculate logs in early spring if they have been cut during the winter. You can usually begin to inoculate logs one month before the average last frost date as long as day-time temperatures are above 40^o F.

If you cut logs during summer, it is best to inoculate them within 3 weeks after they have been cut so that the logs will still have an adequate moisture content. After inoculation, the logs are just placed in a shady place out of the wind.

Logs generally begin producing 6 months to 1 year after inoculation; after which, they usually continue to fruit for 4 years producing 1-2 lbs. per year. The timing of mushroom production in nature depends on both temperature and the timing of rain. Once a log has “flushed” (produced a crop of mushrooms), it should be allowed to “rest” for at least 10 to 12 weeks to provide the mycelium time to replenish the energy required for fruiting.  Each log usually produces 2.5 lb - 4 lb over its lifetime. For inoculation, you will need a drill with a 5/16 inch drill bit, a hammer and cheese wax.
 

Step 1
Drill 1 ¼ in. deep holes into the log spacing the holes about 6 - 8 in. apart within a row. Leave approximately 2 to 4 in. between the rows and offset the holes so that they form a hexagonal pattern. A 4 in. diameter log will need 6 rows; a 5 in. diameter log will need 7, and a 6 in. diameter log will need 9 rows. A 4 in. log usually is given about 40 - 50 plugs. The more plugs you use per log, the faster the wood will be colonized with mushroom mycelium.  A large stump usually requires 100 holes arranged in a similar hexagonal fashion around the trunk and with holes on the top of the stump as well. All mushrooms are inoculated into logs in the same way.
 

Step 2
Hammer the plugs into the holes.

Step 3
Cover the plugs with the cheese wax. To do this, melt the wax in a pan which can be maintained at 300^o F. An electric frying pan with a thermostat control works well for this.
If inoculating away from electricity, using a camp stove, make sure that the wax is hot when you apply it; otherwise, the wax will not create a tight seal and can easily fall off. The wax can be applied with a foam paint brush or cotton dauber.

Mushrooms can also easily be grown on a small scale for home consumption in a highly productive backyard mushroom garden with just a few logs.
By inoculating just 10 logs each year, one can harvest up to 25 pounds of fresh mushrooms each year. The total number of mushrooms you can expect to get on each log or stump will vary from log to log, from season to season and from year to year.  Approximately 100 plugs are needed to inoculate 3 logs.

COMPLETE INSTRUCTIONS WILL BE INCLUDED WITH YOUR ORDER
For details on log cultivation see:  
Growing Shiitake Mushrooms in an Agroforestry Practice (PDF)   or

PRODUCING SHIITAKE MUSHROOMS: A GUIDE FOR SMALL-SCALE OUTDOOR CULTIVATION ON LOGS (HTML)  or PDF

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WE GUARANTEE THAT THE PLUG SPAWN YOU RECEIVE WILL BE VIABLE. and CAPABLE OF PRODUCING MUSHROOMS. WE CAREFULLY CHECK EACH STRAIN OF SPAWN WE DISTRIBUTE.
The total number of mushrooms you can expect to get on each log may vary from log to log, and will depend on your care of the logs and environmental conditions.