We have 3 Jacob's Robe roses, and they have beautiful flowers and lots of thorns. My question: how tall are they supposed to grow? Every, and I mean every, other rose in our garden had grown taller than it was supposed to, and these 3 "climbers" can not get over 5 feet. They look pretty on the sides of their trellis, but it would be really nice if they could make it to the top.

This is their 4th year. They have lots of water, sun, good soil and organic rose food in our Vancouver Island Zone 8 garden. I tidy them up in the spring, and deadhead throughout the year.

Any suggestions / advice would be most welcome.

Thank you...Pauline