Short answer
Root rot in Ficus elastica typically results from water pooling around the roots in heavy, poorly draining soil. The most effective fix is to unpot the plant, trim away all mushy, black roots, and repot it into a fast-draining, chunky potting mix in a container with drainage holes.
Root rot in Rubber Plants manifests as yellowing lower leaves that eventually drop, accompanied by a limp, sagging appearance of the foliage even when the soil feels moist. It is a serious condition for this species because their thick, woody stems and waxy leaves often hide the decline until the damage is significant, making early intervention critical.
Ficus elastica requires a drying period between waterings; keeping the soil constantly saturated prevents oxygen from reaching the roots. This leads to an anaerobic environment where pathogens thrive and the root tissue effectively drowns and rots.
Check: Check if the soil has stayed damp for more than two weeks or if water is pooling in the decorative cachepot.
Fix: Adjust your watering schedule to wait until the top 2-3 inches of soil are dry to the touch, and ensure the pot has functioning drainage holes.
Rubber Plants prefer a porous substrate that allows for rapid aeration. If the plant is still in dense, peat-heavy nursery soil, the center of the root ball may remain soggy long after the surface appears dry.
Check: Gently lift the plant from its pot and observe if the soil texture is dense, muddy, or lacks perlite and bark.
Fix: Repot the Ficus into an aroid-style mix containing orchid bark, perlite, and high-quality potting soil to increase drainage.
While less common in indoor containers than outdoor settings, fungi can attack roots already weakened by water stress. These pathogens break down the root structure, preventing nutrient and water uptake entirely.
Check: Inspect the root system for a pungent, foul smell and roots that are black or slime-covered rather than firm and white or light tan.
Fix: Trim all affected roots with sterilized shears, dip the remaining healthy roots in a dilute hydrogen peroxide solution, and repot in fresh, sterilized medium.
When to worry
You should take urgent action the moment you notice the stems near the base turning soft or mushy, as this indicates the rot has moved from the roots into the main plant structure.
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Diagnose my Rubber PlantYes, if the remaining healthy roots are sufficient to support the plant. After trimming the rot, keep the plant in a slightly smaller pot to avoid excess moisture and monitor for new leaf growth.
No, never fertilize a stressed plant. Fertilizer can cause chemical burn on already damaged root tissue, which will accelerate the decline.
Once the root system is stabilized, the plant may grow new foliage, but it will not regrow leaves on the bare parts of the stem. You may need to prune the top to encourage branching if you want a fuller look later.
Consistent with guidance from: University of Florida IFAS Extension, Royal Horticultural Society.