Warc/Coch Amazonica browning leaf tips

[Jinh]

So I purchased this as a very large, healthy specimen from Hausermann’s probably in 2020 or 2021. It had 3-4 large mature fans and 3 new growths. It was growing well, but I went on vacation and the path of the sun shifted some and this ended up getting direct summer sun. 😭

When I came home the whole thing was scorched. All of the fans/growths died. I held onto it and eventually from the ashes came a new tiny growth.

It has taken a fair amount of time to grow this small fan and has actually started a new fan finally.

However, a few months ago the tips started to brown and look wet (like an infection) when watered. But within a day or so, the brown spot would dry up and not progress. I tried repotting first thinking maybe some roots were starting to rot. The roots actually looked fantastic and pretty extensive. I had to use an extremely large pot compared to the size of the plant to accommodate all the roots.

So I thought maybe it was too wet. I started letting it dry more and then it developed accordion leaves.

Then I decided to water in some Physan 20. It still continued. So then I thought maybe it was the water quality (my tap is pretty close to a ph of 8, with a tds of 144).

I collected some rainwater and started using it, but still am getting the brown spots that only progress when watered.

All I can think now is that since it is a hot grower, it’s been a bit unhappy as temps have been cooler since it has been winter. I haven’t fertilized much since temps have been cooler.

Not sure what else to try, wondering if anyone had any suggestions.