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oleanders not blooming

When I bought my home 4 years ago my oleanders were blooming beautifully. Two years ago a freeze heavily damaged the leaves (they turned brown) and then the city came in to put in some underground pipes so they pruned them heavily up to about the 5 foot height. They are now about 15 feet tall and seem healthy but no blooms. Is there anything I should be spraying on them or incorporating into the soil? Also, how often should I be watering them to keep them out of my septic system? Thanks.
Submitted by BHGPhotoContest

It often takes oleander and other blooming plants several years to recover from severe pruning to once again reach blooming size.  If the plants are growing well, you shouldn't need to spray anything on them to get them to bloom again.
How close are the oleanders growing to your septic system? Their roots are not especially invasive, but a weekly watering should provide the moisture the roots need in the area watered.

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