In spring 2014 I bought two Japanese Wineberry plants (online, from Kore Wild Fruit Nursery, Wales). When they arrived they were max 4cm high. In their first summer they grew about 4 metres each (a growth factor of 100 - wow!) and the canes bent over under their own weight, touched the ground and rooted at the tips (as wild brambles/briars do).
My question is: should I cut them in the middle, or just leave them alone?
I'd like to develop a thick stand of this berry, so I guess I'm asking what's the best way to get them to vegetatively reproduce?