Is this due to root rot? Temps? Or something else? Leaves have been curling down due a few weeks, and now they are starting to droop and dieback quickly over the last few days. There is some new growth still though. Do I need to uproot it and check / cut roots?
I've had good luck with a product from Gardens Alive - I'm not sure if it was exactly this but was similar: https://www.gurneys.com/product/knock-out-gnats-trade-granules
As is typical for Gardens Alive, it's expensive; you maybe able to find something equivalent for less.