Oleander

Mireille, what is the colour of the flowers ? Are they poisonous ?

Yes it's the Nerium Oleander (Apocynaceæ)
The Mediterranean Oleander

The colour of this Oleander is white.
The plant is rather toxic and, as such, quite a bit dangerous. All parts of the plant are potentially poisonous but really, it is the sap of a milky whitish colour that is the carrier of its toxic properties. Look, but don’t touch.
And mind out if you have young children.

Thank you for your comment Autumn