I ordered a rhododendron online. I plan to grow it indoors on coco coir and General Hydroponics nutrient solutions. The plant is fully budded without flowers and also has green leaves. Unfortunately, it spent 5 days in a row inside a delivery truck with the average temp about 34°F and a few nights around 28. Now the leaves are kind of brittle and the buds are browned on the top. If/when the leaves start dropping, is my plant dead? Could the cold temps have prematurely brought the plant into hibernation? What if the leaves stay and the buds die without flowering? Bonus points for knowing how many cold hours a rhododendron needs to have to flower each year, but I can ask a separate question for that.
Edit: Here's more info. I answered the chill time part.
PURPLE PASSION Blueberry Glaze is an interspecific hybrid, mid-chill ornamental variety that with an estimated chilling requirement of 600 hours and cold hardiness limit of Zone 5. (I live in zone 5A)