Japanese Oleander

Question

We live in the low desert of AZ. We had a young sisu (Rosewood tree) removed because of a possible root problem. . . . . . It was suggested we plant a Japanese oleander and shape it like a tree, or maybe there is a tree variety.

Is Japanese oleander poisonous, or as poisonous as shrub oleander?

Answer 1

I believe you are referencing a Yellow Oleander.
Yes, this is a poisonous tree also.

https://en.wikipedia.org/wiki/Cascabela_thevetia