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The free lecture will be at the Clallam County Master Gardener Demonstration Garden at 2711 Woodcock Road.
Gardeners will learn how to make mushroom growing kits using pasteurized straw and grain spawn.
Dietz also will discuss making organic fertilizer, which he calls “Sequim Terra Preta,” using charcoal, a byproduct of straw cooking and red wiggler worm castings.
He will have a red worm bin tower to show how well the worms turn the spent mushroom straw into castings.
Dietz has been foraging for wild mushrooms for more than 25 years and cultivating half that time.
He is a member of the North American Mycological Association, Kitsap Peninsula Mycological Society and Olympic Peninsula Mycological Society.
He served six terms as president of the local societies and currently is serving as treasurer of the latter.
Dietz has presented educational seminars for the Clallam and Jefferson County Master Gardeners and has been a speaker for the Pacific Northwest Mushroom Festival, Quimper Grange, Radical Mycology Convergence and several other orchard and garden clubs in the region.
This presentation is a part of the Class Act at Woodcock Garden series, which is held on select Saturdays from May through September at the Woodcock Demonstration Garden.
For more information, phone 360-417-2279.