Eucalyptus wood chip mulch is an effective, readily available substrate for growing mushrooms, particularly oyster and wine cap varieties, when properly prepared. While some eucalyptus oils can initially inhibit fungi, using aged (aged 2-4 weeks) or semi-fresh chips helps, as does inoculating with hardy mycelium in shaded, moist environments.
Suitable Mushroom SpeciesOyster Mushrooms (Pleurotus spp.): Pearl and Phoenix oysters are highly adaptable and thrive on eucalyptus, making them ideal for beginners.Wine Cap (Stropharia rugosoannulata): These "garden giants" thrive on wood chip beds and can colonize eucalyptus mulch, especially when mixed with straw.Shiitake (Lentinula edodes):
While typically grown on logs, some success has been reported with shiitake on eucalyptus chips.Cultivation MethodPrepare the Chips: Use chips aged for a few weeks to allow volatile oils to dissipate.Inoculation: Layer sawdust or grain spawn with the eucalyptus chips, adding moisture as you go.Environment: Place in a shady, moist area. A, suggests lining beds with cardboard to manage weeds and maintain moisture.
Maintenance: Keep the bed moist but not waterlogged to allow the mycelium to dominate.Key ConsiderationsFreshness: Freshly chipped eucalyptus can be hot and acidic; letting it sit for a few weeks ensures better success.Contamination: Use high-quality spawn to ensure your chosen mushroom outcompetes natural fungi in the wood.
Water Management: As mentioned on Reddit, maintaining high moisture levels in the heap is critical, and, according to a Facebook post, you can try heat/pressure sterilization, but the "best fungi" often win in outdoor beds.
Soil Health: Note that repeated, heavy use of wood chips, including eucalyptus, can sometimes create hydrophobic, water-repellent soil conditions over time.
