With heavy rains, mushrooms have been popping up in mulch, garden beds and lawns all around Colorado. But they don’t stick around too long. It’s like the obscure ’90s Dada song, “Here Today, Gone Tomorrow.” Mushrooms in a bed of garlic. (Tamara Yakaboski, Special to The Denver Post) Mushrooms’ popularity has risen over the last few years with most gardening forums saying that they are a sign of healthy soil.