They grow in San Diago (take a look at Delonix 1) they have pictures of it growing in Bilbao Park.

This is a plant found in the Mojave desert regions of south western america, so I think your climate may be a bit too humid for it to grow well, but I'm not an expert on american climates, and may be wrong.
The botanical name for the Joshua tree by the way is Yucca brevifolia, hope this helps, Derek.

Everybody now logging on to Yucca brevifolia on Wikipedia!
Ha ha.

They have actually got a Joshua Tree National Park .
Imagine that. They must love that tree !
States where it will grow detailed on Wikipaedia.

I would try anyway on the off chance - they are so beautiful Good luck.