Why Aloe Turns Brown or Mushy

Mushy means water, almost always

A brown, soft, translucent aloe leaf is a waterlogging symptom. Aloes store water in their leaves and evolved in free-draining ground; they have essentially no tolerance for sitting wet.

Iowa State Extension describes overwatered succulents showing “yellowing leaves as well as soft and mushy leaves and stems,” with soil that stays wet or damp and sometimes mould or fungus gnats appearing.

The distinction that matters is texture. Sun damage and drought produce dry, papery, brittle tissue. Water damage produces soft, wet, translucent tissue that smells sour when it is advanced.

Why the plant looks thirsty while drowning

Iowa State explains the mechanism: waterlogged soil has low oxygen, which kills roots. The plant then shows water-stress symptoms that are “often mistaken for underwatering, prompting harmful additional watering.”

An aloe with rotted roots droops, shrivels and browns exactly as though it needs water. Watering it again is the last thing it needs and usually the thing that finishes it.

Before you water a struggling aloe, check the soil and check the base of the plant.

Working out how far it has gone

Slide the plant out of its pot.

Roots firm and pale, only outer leaves affected. Recoverable. Remove the mushy leaves at the base with a clean blade, let the plant sit dry for a few days, and repot into gritty free-draining mix in a pot with a drainage hole.

Roots brown and soft, base of the plant squashy. Serious. Cut back to firm white tissue. If any solid crown remains, let the cut surface callus in open air for several days before repotting into dry mix, and do not water for a week or more afterwards.

Base collapsed entirely. The parent is gone. Look for offsets — pups around the base — which are frequently unaffected and root readily.

Brown but not mushy

Not every brown aloe is rotting.

Sun scald produces what Iowa State describes as “brown or tan patches that form on leaves and/or stems,” typically after moving a low-light plant into bright sun. The patches are dry, firm and localised to the exposed side. They do not recover, but they are not spreading either. Move the plant into stronger light gradually.

Underwatering produces leaves that curl inward, thin, wrinkle and brown at the tips while staying dry and leathery.

Cold damage produces water-soaked patches that later brown, usually on the side nearest a window.

Getting the watering right afterwards

The habit that causes this is watering on a schedule. Use the mix instead: water thoroughly, let it drain completely, empty the saucer, and do not water again until the mix is dry all the way down — which in winter in a cool room can be a month or more.

An aloe that is slightly underwatered looks a bit thin. An aloe that is slightly overwatered dies.