Troubleshooting
river clog plant problems — and how to fix them
river clog plant (Nematanthus fluminensis) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown and stem rot
Although this species prefers slightly moister conditions than relatives, poorly draining soil still causes rot. Always use pots with drainage holes and a free-draining mix.
Lack of blooms
Insufficient light is the primary cause of no flowers. Move to a brighter location. A brief cooler period (15–17°C) for 4–6 weeks in autumn can also stimulate the next flush of blooms.
Fungus gnats
Consistently moist soil attracts fungus gnats. Allow the top 1–2 cm to dry between waterings and apply a layer of horticultural sand on the soil surface to deter egg-laying.
Prevent river clog plant problems before they start
Most river clog plant issues are care-mismatch, not bad luck. Dial in the basics:
Looking for river clog plant in general rather than its problems? Read the full river clog plant care guide — light, water, soil and feeding.
river clog plant problems — FAQ
Why is my river clog plant crown and stem rot?
Although this species prefers slightly moister conditions than relatives, poorly draining soil still causes rot. Always use pots with drainage holes and a free-draining mix.
Why is my river clog plant lack of blooms?
Insufficient light is the primary cause of no flowers. Move to a brighter location. A brief cooler period (15–17°C) for 4–6 weeks in autumn can also stimulate the next flush of blooms.
Why is my river clog plant fungus gnats?
Consistently moist soil attracts fungus gnats. Allow the top 1–2 cm to dry between waterings and apply a layer of horticultural sand on the soil surface to deter egg-laying.