Does anyone know what this growth is on my clones?

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Nothing I’ve ever seen before, but fungus of some kind. Toss it ASAP or use a broad spectrum fungicide if you absolutely need to keep it.

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It’s root development, which will harden off after a while.

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Y’all ever see the callus go up the stem like that? IDK, maybe in like 100% humidity or something but not like that and not that white/fluffy looking. Never seen a cut do that.

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Yes, High humidity in the dome is the cause.

If you cut a cube at mid cloning you will see the same thing.

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It looks alot like callousing. Ive seen it do it up a split stem. I forgot to add it was where tape was placed.

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I thought I was looking at a bug at first. never seen that b4

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looks like fingers

A H2O2 bath, is what I’d do.