Removing Arms from an Argentine Giant Cactus

Pruning Large Arms of an Argentine Giant (Echinopsis terscheckii) Arms pressing against house and sidewalk in Phoenix. Owner asks if safe to remove themselves. DIY Method Wrap arm in rug/carpet to protect from spines.

Yellowing Base on Euphorbia hermentiana After Repotting

Post-Repotting Decline: Likely Rot from Poor Drainage Two Euphorbia hermentiana moved from root-bound pots to larger pots with cactus soil around base but regular potting soil above. No drainage holes. Watered 1–2x/month

Healing a Split Top on a Tall Pilosocereus

Wind-Split Cactus Tops: Fungicide and Dry Rest A 5-foot Pilosocereus pachycladus fell in high wind; each stem split 4–6 inches down from the top. No pieces broke off. Treatment Dust cracks with fungicide/insecticide po

Identifying a Bromeliad, Not a Cactus

Flea Market Find: Bromeliad with Agave Pup A plant bought at a flea market, ~1 foot tall with a 2-inch central hole, is identified as a bromeliad (tropical), not a cactus. The small companion is an agave (succulent). Ca

Cactus Spine Injury to Scalp: Medical Advice

Multiple Cactus Spine Punctures to Temple: See a Doctor Person received several spine punctures to the temple/head, removed visible spines, now has swelling and pain. Possible Causes Allergic reaction to cactus sap. Re

Removing Top Growth from a Tall Cactus

Can You Cut Off a New Arm Growing from the Apex? A 6-foot cactus (possibly Mexican fence post or Peruvian torch) has a new offshoot at the top. Owner wants to remove it due to ceiling height. Procedure Use sharp, steri

Moving and Repotting a Prickly Pear Type Cactus

Handling a 3-Foot Opuntia-Type Cactus Without Glochid Misery Owner needs to move and repot a cactus with flat oval pads and irritating fine spines (glochids). Moving Wrap in a rug or thick blanket; secure. Lift by base

Repotting a 7-Foot Columnar Cactus Safely

How to Transplant a Large Spiny Columnar Cactus Indoors Step-by-step guide for repotting a 7-foot columnar cactus in a 10-inch pot in Cincinnati (indoors). Supplies Pot: height ≈ 1/3 plant height. Soil: well-draining s

Will Coral Cactus Pups Develop Crests?

Propagation of Euphorbia lactea Cristata: Crest Inheritance Uncertain Owner removed two babies from a crested coral cactus, rooted them, and asks if theyll develop the distinctive fan-like crest. Answer Crests (cristate

Etiolated Growth on a Columnar Cactus

Abnormal Thin Growth on a 30-Year Cactus: Etiolation A columnar cactus (purchased ~1992) in NYC showed no growth for years, then produced thin, pale top growth in the last year. Base is brown and hard (corking). Diagnos

Leaning Saguaro: Safety and Pruning Options

11-Foot Saguaro Leaning: Assess Risk Before Acting A saguaro planted in 2000 is now 11 feet, leaning toward the right and rear. Owner reduced nearby drip irrigation. No arms or flowers yet. Sways in wind. Concerns Sagu

Reviving Frozen Aloe Vera Plants

Aloe Vera Left Out at 28°F: Wait-and-See Approach Two aloes in Minnesota froze; leaves brown, tips dried, red fluid oozing. One has firm center, the other fell apart. Care Plan Induce dormancy: cool (~60°F), natural li

Treating a Spreading Brown Spot on Oreocereus

Rot on Oreocereus hendriksenianus: Surgical Removal A 20-inch Oreocereus indoors under grow lights develops an expanding brown spot. Owner reduced water, uses light every other day, temp 68°F. Diagnosis Likely rot (dry

Corking on Mature Euphorbias

Brown Bark-Like Base on 14-Year-Old Euphorbias: Normal Aging Two large Euphorbias (misidentified as cacti) show brown, hard skin at the base after 14 years. No softness or ooze. Diagnosis This is corking—a natural matur

Saving a Large Rotting Euphorbia trigona

Rescue of a 5-Foot Euphorbia trigona After Cold and Wet Exposure An indoor Euphorbia trigona left out in cold rain developed soft, mushy, foul-smelling branches. Base is firm and green. Emergency Surgery Cut off all br

Grafted Cactus (Moon Cactus) Decline

Why the Base of a Grafted Cactus Turns Yellow A 15-month-old grafted cactus (red scion on green base) shows yellowing, weakening base. Scion looks good. Explanation These grafts (often Gymnocalycium scion on Hylocereus

Rooting Aloe Vera Offsets (Pups)

Propagating Aloe Vera from Broken Clusters An overgrown aloe at work had clusters broken off at joints and placed in water. Owner asks if theyll root or need soil. Correct Method Let broken clusters callous 2+ weeks (c

Managing a Leaning Giant Cactus

Stake or Prune a 5-Foot Columnar Cactus Leaning into Driveway A fast-growing cactus in Southern California desert has bushed out at the top, becoming top-heavy and leaning 2 feet. Options Stake it. Use sturdy stakes an

Corking vs. Rot: Diagnosing Brown Base on Tall Cactus

Brown, Hard, Hollow-Sounding Base: Corking or Dry Rot? A 6–7 foot columnar cactus (possibly Euphorbia) shows brown discoloration from base upward, hard texture, hollow sound when tapped. No watering changes. Corking (Na

Freeze Damage Recovery for Trichocereus and Echinocereus: Post-Freeze Protocol

Catastrophic Freeze Event in Potting Shed Radiator failure causes freezing of established collection: Trichocereus spachianus, Echinocereus species, unknown flat yellow-spotted cactus, and Crassula (confirmed dead). Symp