Why does your Graptosedum (Corrected from Cremnosedum) have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
These small black flies breed in the moist organic matter of the potting soil. In succulent species like Graptosedum, they thrive when the substrate remains damp for too long between waterings.
Similar to fungus gnats, these flies are attracted to decaying organic material and high humidity levels within the succulent's potting mix.
While not a direct cause of flies, decaying roots due to nitrogen issues can create an environment that attracts scavengers and larvae.
Your plant might also be experiencing one of these issues: