Source: The Great Interpretation of Dreams (Ibn Sirin)
The oleander tree in a dream indicates a hypocritical man of bad character, or a matter containing deadly poison.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Oleander indicates worry, grief, and illness.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Oleander is interpreted as worry and illness.