Troubleshooting
Water Parsley problems — and how to fix them
Water Parsley (Oenanthe javanica) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Invasive spread
Spreads aggressively by stolons and can escape into waterways and wetlands; always grow in submersed baskets or containers and never plant directly into open watercourses.
Aphids on new growth
Lush, nitrogen-rich young shoots attract aphid colonies in warm weather; knock off with water or apply insecticidal soap carefully away from open water.
Prevent water parsley problems before they start
Most water parsley issues are care-mismatch, not bad luck. Dial in the basics:
Water Parsley problems — FAQ
Why is my water parsley invasive spread?
Spreads aggressively by stolons and can escape into waterways and wetlands; always grow in submersed baskets or containers and never plant directly into open watercourses.
Why is my water parsley aphids on new growth?
Lush, nitrogen-rich young shoots attract aphid colonies in warm weather; knock off with water or apply insecticidal soap carefully away from open water.