Answer: I agree with you, the affected shrubs may be getting some reflected heat from the roadway, in addition to extra heat radiated at night from the blacktop surface. They will probably adjust to their situation, but being recently planted puts them at a disadvantage. The plants are trying to become established which is stressful in itself. Couple that with summer weather and reflected heat and it's no wonder they're wilting! Supply regular water (once or twice per week, depending upon weather), making sure to drench the soil, providing moisture to the entire root mass. Don't fertilize until next spring. By then your oleanders should establish themselves and will require less water during the growing season.
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