Explorer · 10–14 · Free
The Casing Layer: Button & Portobello
5 lessons · 49m
Meet the world's most familiar mushroom! The button, cremini, and portobello are all one species with a surprising secret: they only fruit when you top their compost with a moist blanket of soil called the casing layer.
Begin lesson 1In this course
Optional product to explore
An optional product example for exploring mushrooms with a grown-up. It is sold in an external shop; check the supplier’s instructions and materials. Learning here stays free.
Growing (and tasting!) mushrooms is a hands-on project. Young growers should always work together with an adult.