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Avatar for Maconway53
Jun 11, 2020 8:25 AM CST
Thread OP
Hi I recently used neem oil on all my plants as I couldn't figure out which one had gnats attracting to it. About a week later this strange white/orange ish hard things appeared. Now today I am noticing maybe some mold is forming? Has anyone seen this before or know what this is? Thanks in advance for the help.
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Jun 11, 2020 9:11 AM CST
Name: Will Creed
Prof. plant consultant & educator
It looks like a type of fungus. It is harmless, but it thrives in the same conditions as fungus gnat larvae - soil that stays constantly moist. Your plant would benefit from your letting it get dry deep into the pot before watering. That drying out will also discourage mold and gnat larvae - a win, win, win!
Will Creed
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Jun 11, 2020 9:12 AM CST
Name: Big Bill
Livonia Michigan (Zone 6a)
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It looks like stained sponge rock which is a soil additive stained from being part of the soil mix.
Orchid lecturer, teacher and judge. Retired Wildlife Biologist. Supervisor of a nature preserve up until I retired.
Jun 11, 2020 10:15 AM CST
Name: Daisy I
Reno, Nv (Zone 6b)
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That's exactly what it is: stained sponge rock. I do see some other white-ish stuff in photo #2. It could be mold but looks more like leaching minerals or crushed sponge rock.

Fungus gnats only stay in soil kept too wet. As you are growing succulents, fungus gnats should never be a problem. If your soil is wet enough to attract gnats, your succulents do not have a long life expectancy.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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Avatar for Maconway53
Jun 11, 2020 11:54 AM CST
Thread OP
Thank you for the responses! I've had this plant for over two years and never had any issues. I have other plants that need more watering than succulents which is probably where the gnats were coming from but I treated all my plants with neem oil just to be sure. This plant was the only one that started forming this white stuff that was seen in picture two. I'll be sure to keep the soil dry and an eye on the possible mold or fungus. Thanks again!
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