Short answer
Black spots on a Jade Plant are most often caused by fungal infections or physical edema triggered by overwatering or poor air circulation. The single most common fix is to reduce your watering frequency to allow the soil to dry out completely and increase airflow around the foliage.
Seeing black spots on your Crassula ovata can be alarming, but it is usually a sign that your succulent is struggling with moisture management rather than a fatal systemic disease. While these spots are often unsightly, they are typically manageable if you adjust your care routine early.
Excessive humidity or water sitting on the leaves allows fungal pathogens to thrive. These spots often start small and can appear dark brown or black, sometimes with a slight indentation.
Check: Check if the spots feel soft or mushy; if they are dry and crusty, it may be an old infection that has since stopped spreading.
Fix: Immediately prune away the most affected leaves, ensure the plant is in a well-ventilated area, and avoid misting or getting water on the leaves during irrigation.
When roots absorb more water than the leaves can store, the plant's internal cells can burst, leading to dark, scab-like spots. This is a common response to infrequent but heavy watering sessions that keep the soil waterlogged for too long.
Check: Inspect the root system; if the roots appear dark, mushy, or smell slightly off, your watering schedule is likely too aggressive.
Fix: Repot the Jade in a fast-draining succulent mix with high perlite content and switch to a more conservative watering cycle, ensuring the pot has drainage holes.
Scale insects or mealybugs can sometimes feed on the succulent tissue, leaving behind small necrotic spots where they punctured the leaf. These pests are notoriously good at hiding in the nooks where leaves meet the stem.
Check: Use a magnifying glass to look for small, brown, bump-like scales or white cottony fluff in the crevices of the plant.
Fix: Dab the spots with a cotton swab soaked in 70% isopropyl alcohol and treat the entire plant with neem oil or insecticidal soap.
When to worry
If the black spots are rapidly spreading to the main stem or if the stem itself begins to feel soft or turn black, the plant may have developed rot, which often requires emergency surgery or cuttings to save the plant.
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Diagnose my Jade PlantIt is best to prune only the heavily affected leaves to prevent the spread of fungus, but avoid removing more than 20% of the plant's foliage at one time to prevent stress.
You can use a copper-based or general-purpose succulent fungicide, but it will not cure existing spots; it will only prevent new ones from forming while you fix the environmental issues.
Rot typically originates at the soil line or roots and causes the base to become mushy, while fungal spots usually appear scattered across the upper foliage due to moisture sitting on the leaves.
Consistent with guidance from: University of California Agriculture and Natural Resources, Royal Horticultural Society.