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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Species >> Cactus

Columnar Cactus Top Rot in Low Light: Cold Damage Likely, Photo for ID Needed

Top-Down Rot in Winter = Cold

Black/brown patches spreading from tip + pale color = freeze damage. Low light compounds stress.

Action

  • Move to brightest spot.
  • Zero water until soil dry.
  • Photo to expert for species ID (care varies).
  • If Euphorbia: cut black parts now.

Survivors

Other two cacti in pot may be fine. Isolate if rot spreads.

Cactus
Ornamental Cactus Crown Rot: Surgical Removal and Cultural Correction
Surgical Rescue of a Rotting Pilosocereus Azureus
Saving a Totem Pole Cactus After Trauma and Rot
Re-rooting a Sunburned, Top-Heavy Mexican Fencepost Cactus
Source of Red Dye from Cacti: Cochineal Insects on Opuntia
Orange Top Cactus (Grafted) Shriveling, Yellow Mushy Base: Dead, Top Won't Survive Alone
Grafted Cactus Basal Rot: Top Scion Likely Lost Too
Cold Window Damage: Emaciated Cactus, Root Loss, Monitor for Recovery
Why Your Cereus peruvianus Is Bending at the Top
Cactus Plants: Low-Maintenance Succulents for Dry Indoor Air
Garden Articles

Stabilizing a Leaning Heirloom Columnar Cactus

Transplanting a 30-Year Blooming Zygocactus (Christmas Cactus)

Rotting Barrel Cactus: Low Survival Odds

Agave Snout Weevil: Identifying and Treating the Pest That Mimics Rot

Partially Broken Cactus: Clean Break, Dual Propagation, and Light Upgrade

Neoraimondia herzogiana: Natural Woody Trunk Formation Is Healthy

Tall Cactus Basal Rot: Thin Species = Cut and Root, Fat Species = Lost

Plants

Identifying and Caring for Kalanchoe Daigremontiana: The Mother of Thousands

Diagnosing Drooping in Mature Cactus: Rot Detection and Management

Dropped Cactus Damage Control: Pruning and Spine Removal Techniques

Yellowing Arms Indicate Mother Plant Problem

Treating White Fungus-Like Growth on a Paddle Cactus

Euphorbia Cold Damage: Fast Rot Spread, Basal Damage = Likely Loss

Top-Down Cactus Rot: Frost vs. Root Death, Euphorbia Exception

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