Ox Tongue problems & how to fix them

Gasteria obliqua

Drooping, yellowing, brown tips, or a plant that just won’t thrive? Here are the most common Ox Tongue problems, what usually causes them, and how to turn things around.

Common problems

Root rot

Slow growth means slow water use — soil that stays wet for a week quickly rots the fleshy roots. A fungal or bacterial infection of the roots, almost always triggered by soil staying wet too long. Caught early, most plants recover within a few weeks after repotting; if most roots are already mushy, recovery is uncertain.

Mealybugs

Mealybugs hide deep between the tightly stacked leaves and at the leaf bases. Slow-moving sap-sucking insects that look like bits of white cotton stuck in leaf joints. They are stubborn but very treatable with repeated spot treatment; expect steady improvement over 3-4 weeks.

Example of a long-tailed mealybug on a leaf, on another plant — Example on another plant
a long-tailed mealybug on a leaf
Photo: D-Kuru · CC BY-SA 3.0 at · Wikimedia Commons

Sunburn

Sudden moves into direct sun bleach or scar the leaves; Gasteria prefers gentler light than most succulents. Leaf tissue scorched by more direct sun than the plant was acclimated to, often after moving it to a brighter spot or outdoors. Burned patches are permanent, but the plant itself usually recovers fully once moved - new growth comes in healthy.

Fungal leaf spot

Black spots appear when water sits on leaves in cool, stagnant air. A fungal infection that creates dark spots inside leaf tissue, often with yellow halos, and spreads through water splash on wet leaves. Existing spots will not heal, but with pruning and drier foliage the spread usually stops within two to three weeks.

Example of Cercospora leaf spots with dark rims on a spinach leaf, on another plant — Example on another plant
Cercospora leaf spots with dark rims on a spinach leaf
Photo: Plant pests and diseases · CC0 · Wikimedia Commons

Succulent-specific pests

Root mealybugs hide below the soil line on succulents and cacti — check the root ball when a plant stalls for no visible reason. Mealybugs, scale, and root mealybugs love the crevices and thick leaves of succulents and cacti, sucking sap and weakening the plant. Caught early they are very treatable, but expect a few repeat treatments over 2-3 weeks to break the life cycle.

Example of cottony cochineal scale massed on a prickly pear pad, on another plant — Example on another plant
cottony cochineal scale massed on a prickly pear pad
Photo: Juandev · CC BY-SA 3.0 · Wikimedia Commons

The mistakes that most often kill it

Watering into the rosette so moisture sits at the crown.
Keeping it in dense, water-retentive potting soil instead of a gritty mix.
Placing it in blazing full sun expecting it to behave like a cactus.

Not sure what’s wrong?

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