Rooibos outside of South Africa?

Can Rooibos (Aspalathus linearis) be grown outside of South Africa? I have read it is a nitrogen fixing shrub, so was considering it for a food forest, as it is also an awesome tea. I've also read that due to its specific conditions, ie. symbiosis with certain microorganisms that it doesn't grow outside of a certain area in South Africa. Is this true? I thought it might just be that South Africa has a sort of monopoly on it.

Has anyone heard of it growing outside of SA? If so, could you provide some information on it?

Cheers

Fredd