Q.Can a gardenia survive a prune of deadwood after winter?
About 1/3 of my plant is alive and greening up but the other 2/3 are dead. Should I prune all the other dead wood off? It was over-wintered in an insulated box. I’m hoping stronger roots after two years in the ground will let more plant survive next year.
Go ahead and prune out any dead plant material.
I'm listing a few articles to help you.
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/when-to-prune-a-gardenia.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/fertilizing-gardenias-in-your-garden.htm
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-plant.htm