Hi everyone, I really need some expert advice to save this tree.

**Background & Climate:**

* **Species:** *Baeckea frutescens* (also known as Weeping Coast Myrtle / Gangsong).
* **Location/Climate:** Tropical climate (Hainan Island, very similar to Vietnam). Current daily highs are scorching, reaching around 35°C (95°F).
* **Timeline:** Collected from a coastal wasteland in early March.
* Lighting condition: Currently kept outdoors, placed under the deep shade of a large tree. It receives zero direct sunlight, only bright ambient indirect light.

**What Happened:** After collecting it, I kept it under heavy shade and covered the entire upper structure with a clear plastic bag to act as a humidity dome. It responded amazingly well at first, pushing out a lot of vibrant green growth.

About a month ago, as our local temperatures started soaring towards 35°C, I became worried that the greenhouse effect inside the plastic bag would cook the foliage, so I removed the bag entirely.

It seemed fine for a short while, but over the last two weeks, the new growth on the top branches has completely desiccated, turned brown, and died.

**Current Condition:** Currently, only the new shoots near the very base of the trunk are still green and alive (as seen in the photos). I recently watered it with a mild rooting hormone solution, but it hasn't helped.

**My Questions:**

1. Is this a case of "false growth" where the foliage outgrew the root recovery, combined with sudden humidity shock?
2. Given the extreme 35°C (95°F) heat, should I put a modified, ventilated plastic bag back over the remaining green shoots, or will that suffocate them?
3. Should I prune off the dead top branches right now to stop moisture loss, or leave them alone to avoid shocking the tree further?
4. What is the safest watering and misting strategy to keep that last bit of green alive?

I really want to save this tree. Any diagnosis or emergency steps would be greatly appreciated!

Urgent help needed! My collected Baeckea frutescens (Weeping Coast Myrtle) is dying after removing its humidity dome. Top dried up, base still green.