Received a beautiful gardenia bush and after one days the leaves went limp and curled. Watered in sink and let drain off but leaves got limp and curled again
Curling Leaves on Gardenia Bush
Certified GKH Gardening Expert
This is common with overwatering. This can lead to an infection which will cause sudden wilting. You will have to replace the soil, and I also recommend only watering when the top few inches of soil are completely dry.
I would also suggest for the next time that you water, to mix peroxide at 1 part to three parts water. Or just replace 1/4 of the water with peroxide. This will help kill off any remaining infection in the roots.
Cut the growth off when it dies, and let it come back again.
Here is an article for more information: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/common-gardenia-diseases.htm