What to do about odd growth habit on Blue Girl
I continue to have this problem with her. Last year I posted that Blue Girl looked like she sported climbing canes behind where I originally planted her as a graft. She's doing it again this year.
The pictures below show the growth habit. There are 2 obvious "sections" to her. The shrub in front is the original grafted rose and it's about 3 1/2 feet tall today. It produces one good first flush and then goes kaput. In her second year, large, straight, bamboo-like canes began skyrocketing upward about 6 inches behind the graft. Same flowers, & still Blue Girl, but it just keeps getting taller and taller. The canes are not pliable at all. When I deadhead, she just reaches even further skyward. The blooms are at about the 7 foot mark right now, early in the season. You can't see them or enjoy their scent up that high.
I'm afraid to whack the back section because the canes are completely smooth & there are no bud eyes. (I feel like I'd just be chopping her down with no hope for new growth.) I did prune this back section down from 10 feet to about 4 feet this spring. What the holy heck is going on?