These guys are only on their 2nd yr of growth. I've fed them with a 10-10-10 fertilizer and some steer grow this year and they've really taken off. I kind of expect them to take over this trellis by year's end. I'll most likely need to do some heavy pruning in the winter time to maintain the over aesthetics and to keep it from winding too deeply around the trellis.
These were planted in 2013.