Each April, the Sierra Nevada draws crowds up from the California lowlands in search of one of the more difficult to find wild mushrooms. Morels, the common name for every species in the genus Morchella, begin appearing in mountain conifer forests, where many morel species form associations with native conifers. They are famous for fruiting in great abundance after fires, and many of our recent megafires have sent surges of spring tourists hunting for them among the blackened trees. That abundance does not last. A few years after a fire the boom goes bust, and morels can nearly vanish from a burn, especially where fire killed a high proportion of the mature trees.
The natural morels fruit without fire
What many new morel hunters do not realize is that a healthy forest is often the more reliable producer, and over the long term the more productive one. Some species are strongly tied to fire, but the Sierra has two species, Morchella snyderi and Morchella tridentina, known as natural morels, a term that reflects their habit of fruiting with only minimal disturbance. They turn up along trails, roads, next to rocks or logs, or anywhere the soil sees a little compaction. M. snyderi, our natural black morel, is famously associated with white fir (Abies concolor) and other conifers. M. tridentina, the natural blond morel, grows with sugar pine (Pinus lambertiana) and other conifers. Both can be found along washes, in campgrounds, and most importantly where mastication or forest thinning has taken place. Fuel breaks, thinning, prescribed burns, and mastication of heavy underbrush all tend to create excellent morel habitat.
Forest management makes for a more sustainable harvest
That is the point worth sitting with: catastrophic wildfire risk reduction work can lead to a more sustainable morel harvest. Most of these projects leave an overstory of mature trees intact, exactly what the natural morels need to keep fruiting year after year. So many of the people who chase wildfires for morels would do better to stop chasing fires and start pushing for prescribed fire and mastication instead.
Frequently Asked Questions
Do morels only grow after wildfires?
No. Some morel species are strongly tied to fire and can fruit in great abundance after a burn, but that boom goes bust within a few years, especially where fire killed many of the mature trees. The Sierra also has two natural morels, Morchella snyderi and Morchella tridentina, that fruit with only minimal disturbance in a healthy forest, and over the long term they are often the more reliable producers.
Does forest thinning or prescribed fire help morels?
Yes. Fuel breaks, thinning, prescribed burns, and mastication of heavy underbrush all tend to create excellent morel habitat. Because most of these projects leave an overstory of mature trees intact, they support the natural morels that need those trees to keep fruiting year after year.
Which trees do the Sierra's natural morels grow with?
Morchella snyderi, the natural black morel, is famously associated with white fir (Abies concolor) and other conifers. Morchella tridentina, the natural blond morel, grows with sugar pine (Pinus lambertiana) and other conifers. Both turn up along trails, roads, washes, and campgrounds, and especially where thinning or mastication has taken place.