Emergency: 35-Year Cactus Declining After Major Pruning

A 35-year, 3.5-ft cactus cut back 1.5 ft now withering from the cut point suggests infection entered the wound. The plant may be a Euphorbia (toxic sap) rather than a true cactus—critical distinction for handling.

Immediate Assessment

• Sap test: White latex = Euphorbia (wear gloves, eye protection)
• Cut inspection: Brown/black discoloration = fungal entry
• Base check: Firm? Roots healthy?

If Cactus (Clear Sap)

1. Cut 2-3" below lowest discoloration
2. Callus 3 weeks
3. Reroot in dry cactus mix
4. Base may survive if roots healthy

If Euphorbia (White Sap)

• High toxicity: Sap causes blindness, severe burns
• Do not attempt cutting without full PPE
• Consider professional help
• If attempting: same protocol but extreme caution

Why Rapid Decline?

• Large cut = large wound = infection highway
• No callus time before watering
• Possible pre-existing root issues
• Euphorbia more prone to rot from wounds

Sentimental Value Options

1. Photo documentation for memory
2. Propagate healthy sections (if any)
3. Commission wood carving from dead trunk
4. Plant memorial cutting in same pot

Send photos for definitive ID. The distinction between cactus and Euphorbia determines safe handling.