this bush or what ever it is , is about 12 to 15 feet tall. the small white flowers smell kinda like a magnolia tree , it is very very viney , and has huge thorns on it . so my questions are as follows : 1. what is it ? 2. how far can i cut it back ? 3. is it evergreen ? 4. what is the best way to cut it ? i have tried an extendable hedge trimmer but it is difficult to cut with all the viney limbs. oh , yeh the leaves almost look like a holly plant . any help is greatly appreciated . thanks .