Why do bougainvillea leaves curl?
In this regard, what's wrong with my bougainvillea?
Root rot can cause chlorosis, plant dieback, stunted growth and wilting. The disease is usually caused by fungus such as Rhizoctonia, Pythium or Phytophthora. The fungus infects bougainvillea roots, causing decay and malfunction. Gardeners should remove and destroy infected plants as soon as possible.
Keeping this in consideration, how do you revive bougainvillea?
Cut bougainvillea stems that appear dead at the top but still green and living nearer the ground back into living tissue. Make any cut slightly angled and just above a bud or junction with another stem. Check the cut surface to ensure you cut far enough down the stem that you are severing green, living tissue.
Paint an undiluted herbicide containing triclopyr and glyphosate (found in many commercial stump-killing herbicides) with a paintbrush over the stump. Apply the herbicide immediately to the fresh cut trunk so that the product seeps through the wound into the plant's root system, killing it.