When the bacteria grows in the plant’s tissues, flow of water and nutrients is blocked. Symptoms begin with oleander leaves turning yellow and droopy before taking on a scorched, brown appearance. Unfortunately, the only recourse for oleander with leaf scorch is to remove the affected plants.Click to see full answer. In this regard, how do you revive an oleander? Steps Prune in late summer or early fall. On the whole, oleanders are low-maintenance plants that don’t need regular pruning. Wear gloves. Snip off new shoots at the base of the plant. Cut oleander stems to about half height you’d like for the overall plant. Shape your oleander. Also, what is killing my oleanders? Oleander leaf scorch is a disease that kills oleander shrubs. It causes scorched leaves on oleander plants. This disease doesn’t kill the oleander plants immediately, but it does kill them. Experts say that more than 90% of infected trees will die over the next three to five years. Similarly one may ask, what’s wrong with my oleander? Oleander plants are susceptible to bacterial infections, particularly oleander knot disease and the potentially fatal bacterial leaf scorch. Although plants usually survive the infection, the disease causes unsightly galls and dieback on stems, bark and leaves.How often should I water my oleander?They like to be watered as much as you would water your shade trees – deeply every three days. To aid in water retention, create a reservoir or dike that is 2-4 inches tall around the trunk of the tree.