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Earthworm Casting Speaker The Mahaska County Master Gardeners are hosting a Earthworm Casting /Vermicomposting (composting by worms) speaker on Tuesday, February 11, 2020. Traci Dow-Wyatt and Michael Wyatt are co-owners of Central Iowa Organic Fertilizer, a small family owned and operated business in Indianola, Iowa. They will talk about their operation, which produces OMRI Listed worm castings.  www.extension.iastate.edu/mahaska/yardgarden.htm