Lanette's 30-year-old cactus (2.5" diameter, 2 ft) broke top 2 inches. Placed piece back on. Asks if this kills it or should remove piece.
Most cacti recover remarkably from breakage. If healthy and not dormant, grafting the piece back works if tissues didn't dry out. Keep piece steady for months.
Piece shrivels → remove it. Main stem heals over naturally. In time, damage becomes unnoticeable.
Either approach works. Cacti are incredibly resilient.
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