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My Mix Has Slime Mold! Is It Dangerous?

By: Jessie Keith

Here a yellow slime mold is growing on a fallen tree in nature.

“I bought 8qt of Black Gold Cactus Mix and started repotting my plants. The first bag looked fine, but the second one was covered in orange/rusty colored powder and some fuzzy white blooms. I haven’t used it, but will this happen to the other one as well? What should I do with it?” Question from Rusty of St Louis, Missouri

Answer: It may look funky, but there is no need to worry. The reddish-brown growth found on the top of the potting mix is a harmless saprophytic slime mold. These exist in healthy natural environments and obtain food from dead or decaying organic matter, such as peat moss, rotting stumps, and decaying leaves (also compost). They are rarely able to grow in bags of mix, but clearly, there was enough air, moisture, and warmth in the plastic packaging to allow this misplaced saprophyte to grow and feed on the peat (or decaying organic matter). The saprophytic mold will not harm your cacti, succulents, or other plants in any way. In fact, once the bag is opened, the saprophyte will dry up, dissipate, and never return.

I hope that this helps!

Happy gardening,

Jessie Keith

Black Gold Horticulturist

 

About Jessie Keith


Plants are the lens Jessie views the world through because they’re all-sustaining. (“They feed, clothe, house and heal us. They produce the air we breathe and even make us smell pretty.”) She’s a garden writer and photographer with degrees in both horticulture and plant biology from Purdue and Michigan State Universities. Her degrees were bolstered by internships at Longwood Gardens and the American Horticultural Society. She has since worked for many horticultural institutions and companies and now manages communications for Sun Gro Horticulture, the parent company of Black Gold. Her joy is sharing all things green and lovely with her two daughters.

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