To grow nerium oleander, compost under the plant each spring and water it during the summer if rainfall is lower than 1 inch a week. Compost to the drip line to retain moisture. Watering during dry spells helps the plants look their best.
Prune the shrubs after their main bloom phase to promote bushier growing and more flowers and to control the size of the shrub. If you are planting in poor soil, nerium oleanders require light feeding with a balanced plant food once in the spring with no further feeding. Prune damaged or diseased limbs at any time with no danger to the plant.