Without a clear photo of the plant and the shoot, I cannot distinguish between a flowering spike (normal for Melocactus/Ferocactus—rusty, bristly, do not remove) and a removable offset (can be propagated). Please send a focused image of the cactus body and the shoot. Then I can advise correctly.
Rescuing a Stress-Damaged Columnar Cactus After Relocation
Brain Cactus Recovery: Overwatering Cycle Broken
Large Cactus with Dry Brown Spot: Replanting Risks Shock; Cut Below Spot If Spreads
Car-Wrecked Prickly Pear: Easy Propagation from Pads
Coral Cactus (Euphorbia lactea crest) Brown Patch: Likely Cosmetic
Fast-Rotting Variegated Euphorbia: 5-Inch Clear-Cut Rule and Alcohol Sterilization
Coral Cactus Brown Spots: Causes and Solutions
Winter Care for Coral Cactus in Low-Light Michigan
Coral Cactus (Euphorbia lactea 'Cristata') Care: Glued Rocks, Watering, Repotting
Coral Cactus (Euphorbia lactea crest) Odd Growth: Graft or Sport?
Coral Cactus Splitting After Heavy Rain: Likely Growth Quirk
Mystery Monocot Shoot in Chico, CA: Amaryllis Relative or Humboldt Lily?
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