I'd be inclined to grow it on in a pot for a year or two. Repot it in spring into the next size up until it's in a 5 or 6 inch pot. It can stand outside over summer but put in a sheltered place over winter. then plant it outside, after hardening it off properly next spring.

Thankyou Volunteer, I`ll do that....

Don`t know Bilbo, its been in dads garden a long while and he never could remember, unfortunately I haven`t a pic, its covered in pure white blooms and lasts for weeks in the summertime, I`ve only the one cutting, so as you can imagine I`d hate to lose it..

Good luck Lincslass, I look forward in seeing photos ofthe blooms in a couple of years