What species of log is best?
Some mushrooms are generalists, meaning they’ll grow on a wide variety of substrates, while others are specialists, preferring just a few. You can reference the chart below to find which tree species work best for each mushroom variety, and other types of wood they can be grown on. Preferred species will offer higher success rates, greater yields, and produce longer. Other types of wood can support mushroom growth but may have varying results in yield and length of production.
Most mushrooms grow on hardwoods, some species better than others. Generally, oak and maple perform well across the board. Their dense wood offers a lot of nutrition for a longer, sustained fruiting period. Softer hardwoods like poplar or aspen will myceliate faster and produce mushrooms sooner, but may not yield as much or produce for as many years.
When do I cut the logs:
Healthy, living trees can be felled for mushroom bolts nearly any time of year. It is not recommended to harvest logs during the spring between budding and full leaf out. During this time, most of the nutrients and energy of the tree are expended in a push to develop flowers and foliage, leaving little for fungal growth. Also, bark is loose, increasing the risk of damage during cutting. Intact bark is very important for the spawn run. Never cut dead, dying, or diseased trees for mushroom growing.
Timing log harvests with sap flow can help increase the yield and longevity of your mushroom bolts. This typically coincides with dormancy cycles. Two ideal times for harvest are: during the fall, after ⅓ of tree leaves have changed color through leaf drop and in late winter to early spring before bud swell and leaf out. These are both times when sugary sap in the tree will be concentrated in the wood, providing nutrients for mycelial growth, and bark should be tight reducing the risk of slippage.
For fall inoculation in grow zones 8 and higher, we recommend protecting logs from freezing temperatures. Logs can be overwintered in heated spaces, tucked away close to the walls of heated structures, or stored close to the ground and covered with leaves, blankets, and tarps.
We recommend sourcing logs from a sustainable forester or using sustainable practices in culling trees for mushroom production.
When should I inoculate my logs?
Logs should be inoculated within a week or two of cutting. This allows the cells in the tree to die but is not long enough for the log to dry out or for other competitor fungi to become established. You should not use logs that were cut last year or logs with damaged bark. A month would be about the longest reasonable stretch of time between cutting and inoculating.
Any other tips for selecting trees to harvest?
Trees with more sapwood than heartwood may produce bigger flushes of mushrooms, especially in the case of shiitakes. Often, the sapwood section of a tree is thicker on trees with vigorous growth in open canopies rather than shade-grown trees.
Should the wood be old or freshly cut?
Only freshly cut, disease-free wood should be used. Old or rotting wood should be avoided as it will likely contain contaminant fungi or be too dry to support mushroom growth. Once cut, the sooner you can inoculate the log the better, though you can wait up to 4 weeks after cutting before inoculating the log. When temperatures are consistently below freezing, the inoculation window can be extended for several months by covering freshly cut wood with snow to maintain moisture until you are ready to inoculate in early spring.
Is my spawn moldy?
Mushroom spawn will naturally develop a white (or yellow for Chicken of the Woods), mold-like layer called mycelium. This branching network of threads is the primary body of fungi, the vegetative structure. A good analogy is if a mushroom is like an apple, then mycelium is like an apple tree. Seeing mycelium grow through your bag is normal and indicates healthy mushroom spawn. If your spawn looks green or black, the culture may be contaminated and should be discarded. You can reach out to us for confirmation.
In the following images, you’ll see healthy spawn plugs with different amounts of mushroom culture visible. The first photo shows plugs with minimal mycelial growth. They are completely fine to use and not any less 'potent'. Over time the mycelium will continue to grow and envelop the plugs as seen in the second photograph. This is also normal and doesn't change how the plugs are used, though you may need to break up the plugs within the bag before use to separate them from the mycelial mass. Don't open the bag; simply squeeze it to break up the mycelial mass. The third photo is the same plug bag after it has been broken.
Often, mycelium is broken up in shipping, so it can appear less myceliated. Let it sit for a few days and it should bounce back.
What are the little dots?
Millet! We grow out our mushroom cultures on a mix of nutrient-rich grains to help them transfer onto wood. They are totally normal and can be ignored in your inoculation process.
What if I buy spawn and don’t get around to inoculation right away?
Store the spawn in the fridge until you’re ready. We recommend waiting no more than a few months. Just be sure to inoculate your logs within 4 weeks of cutting them. We recommend avoiding log harvest in the spring between bud well and full-leaf out, since nutrients are directed toward flower and foliage growth and bark is loose. See our section about best time to harvest logs for more info.
What kind of yield can I expect?
The general rule of thumb is one year of production per inch of log diameter. However, yields will vary greatly depending on the mushroom strain, tree species used, and environmental conditions each season.
Shiitake logs usually have their largest flushes during their second and third years producing. A good yield per log is ¼ - ½ pound each flush, with 2-3 flushes per season.
How long will it take before my mushroom logs fruit?
That will depend on what species you’re growing, the size of your logs, and environmental conditions. Most mushrooms on standard size logs in temperate climates will take about a year to fully colonize before they fruit. This can vary between 6 months to two years. Smaller diameter logs and soft hardwoods will typically fruit sooner, though they’ll have less longevity.
Often, mushrooms need cool weather and moisture to fruit. Growth slows in the heat of the summer. If you inoculate in the spring, you might get your first flush of mushrooms in the fall but most likely it will take a full year until you see your first fruiting. If you inoculate in the fall and are able to keep the mycelium from going dormant, you may get mushrooms as soon as the next spring, though more likely the following fall.
How often should I water my log?
It’s important not to let the log dry out but it’s also important not to over-water the log. Logs should be stored in shady outdoor locations close to the ground. In temperate climates, they generally retain enough moisture to colonize fully without watering. During especially dry years, droughts, and in arid climates, watering may be necessary. Most of the time though, no supplemental watering is needed.
It’s okay to water the log to force it to fruit but most growers wait until the log fruits once naturally before beginning to shock them into fruiting. Logs shouldn’t stay wet on the outside for long periods of time. Frequent light watering can even damage logs and cause contaminant growth. Long periodic soaking is the preferred method of renewing water content should your logs appear dry or lose vitality.
How long can I store my spawn?
Plug and sawdust spawn will store for six months to a year in a refrigerator. The fresher the better, but mycelium is pretty resilient. If you don’t get around to inoculating right away, tuck it away in your refrigerator until you’re ready.
Mushroom spawn will naturally develop a layer of white mycelium (or yellow for Chicken of the Woods). This is totally normal and indicates healthy spawn. Break up your spawn bags thoroughly before use. And be sure to use logs cut within 4 weeks of inoculation.
Will hemlock work for Reishi?
There are two types of Reishi commonly cultivated in the US: Ganoderma lucidum and Ganoderma tsugae. Only Ganoderma tsugae will grow on hemlock.