How do you grow jacaranda trees?

I live in Jersey I grew one from a seed a friend gave me it is now app 4yrs old and it lives outside in a very sheltered spot, it is now 5ft tall with lots of leaves, each year we live away in the winter so it is wrapped up in plastic and has some hay put round the trunk, have not had any flowers yet but I read maybe after 5yrs so will keep fingers crossed