Why is my bougainvillea turning yellow?

Considering this, what makes bougainvillea leaves turn yellow?

Leaves, especially the older ones, that are shaded and not receiving enough light, might turn yellow. Too much or too little water might cause leaves to yellow and drop. Plants that are shocked will develop yellow leaves, especially plants recently moved indoors for the winter.

Beside above, how often should I water a bougainvillea? When it comes to watering, bougainvillea is pretty drought tolerant once established. It prefers a good, deep watering every 3-4 weeks rather than frequent shallow waterings. When establishing, be sure to give your bougainvillea regular water. It's subject to a few types of root rots so don't over-water.

Then, how do you revive a 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.

What is 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.