Euphorbia ingens vs. Cereus peruvianus: Frost Damage, Latex Rot Risk, and Selective Pruning

Euphorbia ingens: Latex sap, paired spines, rot spreads fast via latex.
Cereus peruvianus: Clear sap, areoles, rot slower.

Critical ID Difference

Check linked photos for visual ID.

New growth most vulnerable. Indoors near single-pane glass = cold radiates. Dual-pane reduces risk.

High-pressure sodium lamp = intense heat + light. Acclimate slowly (weeks) or sunburn guaranteed. Symptoms: bleached patches, corking.

Cactus: Propagating a Tall Columnar Cactus from Cuttings; Desk Cactus (Grafted Orange Top) Unwatered Year: Water + Fertilizer May Revive, But Graft Shortens Life; Basal Rot in Mystery Cactus: Photo Needed for Species-Specific Rescue; Barrel Cactus Rotting from Top Down After Moving Indoors: Can It Be Saved?; Leaning Saguaro Near Irrigated Lawn: Root Rot and Professional Move; Opuntia Base Corking vs. Rot: The Pencil Test; Tall Cactus Basal Rot: Thin Species = Cut and Root, Fat Species = Lost; Euphorbia Cold Damage: Fast Rot Spread, Basal Damage = Likely Loss; Phalaenopsis Spike Yellowing: Natural Dieback, Not Disease; Identifying and Saving a Mystery Dying Houseplant

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