Cactus Problems
Cactaceae
Cacti are among the most drought-tolerant houseplants, needing intense light, sharp drainage, and a genuinely dry rest period — nearly every cactus problem traces back to too much water or too little light.
All Cactus Problems
⚠ CriticalCactus — Root and Basal Rot in Cacti
The base of the cactus turns soft, dark, and mushy, sometimes with a foul smell, and the plant may topple or feel loose in its pot.
⚠ ModerateCactus — Etiolation — Cactus Stretching Toward Light
The cactus grows thin, elongated, and pale, stretching noticeably toward a light source, with new growth clearly narrower than the older base.
⚠ MinorCactus — Corking on Cactus Stems
The base or lower portion of the cactus develops a brown, rough, bark-like texture that spreads upward over time.
⚠ MinorCactus — Sunburn on Cactus Skin
A pale, yellow-white, or bleached patch develops on the side of the cactus facing intense sun, especially after being moved suddenly from indoor to outdoor conditions.
⚠ ModerateCactus — Mealybugs on Cacti
White, cottony masses cluster in crevices, ribs, and around spines, secreting honeydew and weakening the plant over time.
⚠ ModerateCactus — Scale Insects on Cacti
Small, immobile brown or tan bumps attach to the cactus body, secreting honeydew and weakening the plant over time.
⚠ ModerateCactus — Spider Mites on Cacti
Fine, rusty-bronze stippling or discolouration develops on the cactus skin, sometimes with fine webbing visible in severe infestations.
⚠ ModerateCactus — Fungal Rot Spots on Cactus Skin
Circular, sunken, discoloured spots develop on the cactus body, sometimes with a soft or slightly fuzzy texture, distinct from the whole-plant collapse of basal rot.
⚠ MinorCactus — Wrinkling and Shrivelling in Cacti
The cactus body develops visible wrinkles or a shrunken, deflated appearance, most noticeable along its ribs.
⚠ MinorCactus — Yellowing on Cactus Bodies
The cactus body takes on an unusual yellow or pale tint rather than its normal green colour, sometimes starting at the top or on the sun-facing side.
⚠ MinorCactus — Leaning or Toppling Cactus
The cactus leans to one side or tips over entirely, sometimes due to top-heavy growth or weakened structure at the base.
⚠ MinorCactus — Fungus Gnats in Cactus Soil
Small dark flies hover around the plant and soil surface, thriving in consistently moist potting mix.
⚠ CriticalCactus — Black Rot at the Base of Cactus
The very base of the cactus, where it meets the soil, turns black and soft, distinct from general basal rot in that it often progresses very rapidly.
⚠ MinorCactus — Slow or No Growth in Cacti
The cactus shows minimal or no new growth over an extended period, even during what should be its active growing season.
⚠ CriticalCactus — Cold Damage and Frost Injury in Cacti
Tissue develops water-soaked, translucent patches that turn brown or black after cold exposure, and severe frost can kill the plant outright.
⚠ MinorCactus — Splitting or Cracking on Cactus Skin
Cracks appear on the cactus body, typically after heavy watering or rain following an extended dry period.
⚠ CriticalCactus — Bacterial Soft Rot in Cacti
A water-soaked area develops and spreads quickly, turning the tissue soft, discoloured, and often accompanied by an unpleasant odour.
⚠ MinorCactus — Aphids on Cactus Flower Buds
Small soft-bodied insects cluster on developing flower buds, sometimes causing distorted bud development and sticky honeydew residue.
⚠ ModerateCactus — Root Mealybugs on Cacti
The plant declines gradually with no obvious above-ground pest signs, and when unpotted, small white cottony masses are visible on the roots themselves.
⚠ MinorCactus — Severe Underwatering in Cacti
The plant becomes significantly shrunken, wrinkled, and lightweight, with growth stalling entirely over an extended dry period.
Cactus Care Guide
Light, watering, humidity, fertilising, repotting and propagation — everything you need to keep your Cactus thriving.
Full care guide →See how growers fixed these problems
Browse real Cactus grow diaries from the community — treatments, timelines, and results.
Browse community diaries →Common Cactus Questions
Why is my cactus turning soft and mushy?
The base of the cactus turns soft, dark, and mushy, sometimes with a foul smell, and the plant may topple or feel loose in its pot.… Read the full guide →
Why is my cactus stretching or leaning toward the light?
The cactus grows thin, elongated, and pale, stretching noticeably toward a light source, with new growth clearly narrower than the older base.… Read the full guide →
Why is the base of my cactus turning brown and corky?
The base or lower portion of the cactus develops a brown, rough, bark-like texture that spreads upward over time.… Read the full guide →
How often should I water a cactus?
A pale, yellow-white, or bleached patch develops on the side of the cactus facing intense sun, especially after being moved suddenly from indoor to outdoor conditions.… Read the full guide →
