[header] How to grow organic mushrooms [title] Buy organic mushroom spawn. [step] Mushroom spawn is specially harvested and grown fungal tissue that can be used to grow mushrooms. For the log method, select spawn in the plug form, which is basically spawn contained inside short wooden dowels. 
[substeps] You can buy mushroom spawn at many garden stores or online. To grow organic mushrooms, you may have better luck shopping at online shops that specialize in organic mushroom spawn.