Short answer
Brown spots on a Jade Plant are most commonly caused by edema from inconsistent watering or localized fungal infections due to high humidity and poor airflow. The most effective fix is to adjust your watering schedule to allow the soil to dry out completely between waterings and improve air circulation around the plant.
Brown spots on Crassula ovata typically appear as sunken, hardened, or mushy lesions that can be dark brown or even black. While these spots are often unsightly, they are rarely fatal if caught early, though they suggest that the plant's environment is slightly out of sync with its strict moisture requirements.
When a Jade plant takes in water faster than it can transpire, the leaf cells swell and rupture, leaving behind small, corky brown scabs. This often happens if the plant sits in damp, heavy soil during cooler or darker months.
Check: Check if the brown spots are corky or scab-like and if the soil has stayed damp for more than a week.
Fix: Allow the potting mix to dry out completely before the next watering and ensure your pot has adequate drainage holes.
Jade plants thrive in arid conditions; if exposed to high humidity or if water is left sitting on the foliage, opportunistic fungi can infect the leaves. These spots are usually softer and may spread more rapidly than edema lesions.
Check: Look for a fuzzy texture on the spots or check if the plant is situated in a room with poor air circulation, like a humid bathroom.
Fix: Increase airflow with a small fan, avoid misting the foliage, and immediately move the plant to a drier location.
While Jades love light, a plant moved suddenly from deep shade to intense, direct afternoon sun can suffer from leaf burn. This manifests as scorched, brown, or bleached patches where the sun hit the leaf directly.
Check: Check if the spots only appear on the side of the plant facing the light source or if the plant was recently moved.
Fix: Acclimate your Jade to higher light levels gradually over the course of two weeks to let it adjust to the intensity.
When to worry
You should only be concerned if the spots are spreading rapidly to the stems or if the base of the plant becomes mushy, as this suggests severe root rot that requires immediate repotting.
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Diagnose my Jade PlantIt is generally safe to remove severely damaged leaves with clean, sharp shears, but avoid removing too many at once as this stresses the plant. If the spots are small and dry, you can leave them alone.
Fungicides are usually unnecessary for Jades. Improving environmental factors like humidity, light, and watering habits will almost always solve the issue more effectively than chemical treatments.
Pest damage, such as from scale, often leaves behind a sticky residue or small, removable bumps. If the spots cannot be wiped off and are integrated into the leaf tissue, it is likely environmental or fungal.
Consistent with guidance from: University of California Cooperative Extension Master Gardener Program, Royal Horticultural Society.