My oleanders are sick. Their flowers get some brown spots and soon fall down.?

my oleanders had the same thing, well the leaves got brown spots, might be the same thing? it was some kind of fungus, you can get a fungicide at the garden center of any hardware store that will work. i think it was caused by too much moisture in the soil, so if its been raining alot where you live, that could be the problem.

My oleanders are sick. Their flowers get some brown spots and soon fall down.?
Oleander grows well in warm subtropical regions, where it is extensively used as an ornamental plant in landscapes, parks, and along roadsides. It is drought tolerant and will tolerate occasional light frost down to -10°C . It can also be grown in cooler climates in greenhouses, conservatories, or as indoor plants that summer outside


Oleanders grow best in full sun and will tolerate even reflected heat from a south or west wall. They will tolerate partial shade, but may have a lanky, open shape.





Oleanders are tolerant of many different soil types, but must have good drainage. They will not do well in wet areas. Oleanders are very drought-tolerant once established, but respond well to occasional deep watering.





Oleanders can be allowed to grow in their natural large mound form, or they can be trained to a small multi-stemmed tree. Since oleanders bloom in summer on new growth, prune them in the early spring. Oleanders will tolerate quite hard spring pruning to remove cold damaged or overgrown wood. Remove dead flower clusters to encourage longer bloom. Cut stem tips off to encourage branching after the flowers are spent, but avoid cutting too late in the fall, as the new growth may not have enough time to harden before frost.





Most oleanders will survive temperatures down to 15 to 20 °F, although their foliage will be damaged. Even on the coast some winter damage may occur each year. If the tops are killed back by cold, they will recover quickly in spring as long as the roots were not damaged.





Botryosphaeria dieback, caused by the fungus Botryospaeria species causes branches and shoots to die and turn blackish brown. The disease is more likely to occur when plants have been subjected to drought stress or damaged by severe freezes. Prune out all affected branches, making sure that no discolored tissue is left in the cross section.