Yellowing Arms Indicate Mother Plant Problem

Cactus Arms Turning Yellow to Black: Check the Main Stem

Arms on an unidentified cactus are yellowing/blackening; dried ones removed but spread continues. Plant moved to sunnier spot.

Key Insight

Arms don't die independently unless the mother plant has a problem (rot, vascular issue, root failure). Need details: mother plant condition, arm texture (dry vs. mushy), close-up of spines for ID.

Next Steps

• Send better photos of whole plant and spines.
• Describe onset timeline.
• Check base for softness, odor.