Mushrooms that are eaten are only the fruit of the actual plant. Mushrooms plants are a fungus, growing from small white roots or mycelium. It grows and winds its way through compost, dead leaves or other matter on the ground. Mushrooms, unlike most other plants, do not require soil to grow. They can grow well in almost any substrate substance.
Spread finely ground wet wood chips 9 inches deep in a shady garden area. If planting in a planter, fill a long narrow planter with compost or substrate material. Leaves or straw can be substituted for the wood chips.
Place a chunk of mycelium 1 inch under the surface of the substrate.
Water generously. Maintain a moist soil to encourage germination. Keep potted mushrooms in a cool shaded location with a high humidity. Dry air is harmful for mushrooms. Inspect the substrate often for signs of mushroom fruits above the surface.