Desk Cactus Keeps Rotting: Need Grow Light 15+ Hrs or Switch to Euphorbia

Two Cacti Died at Desk: Cold, Fluorescent Bulb, Now Rot—Any Hope?

Owner asks what survives on desk.

Greg: fluorescent insufficient. Grow light ≥15 hrs/day. Or try succulent Euphorbias—tolerate lower light, look cactus-like.

Cactus: Rescuing a Stress-Damaged Columnar Cactus After Relocation; Rescuing an Etiolated Mystery Cactus: Light Rehabilitation Protocol; Fixing Severe Etiolation on a Tall Indoor Cactus ("Cactus Jack"); Artificial Light Burn on Moon Cactus: Acclimation Protocol; Fixing Skinny, Etiolated Cactus: Support and Light Correction; Essential Indoor Cactus Care: Light, Water, and Soil Tips; Identifying a Fast-Growing Columnar Cactus: Cereus repandus; Opuntia Cactus Indoors: Brown Spots, Lean & Light Needs; Cactus & Lucky Bamboo: Too Much Light?; Pencil Cactus (Euphorbia tirucalli): Geometric Succulent Stems, Toxic Sap

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