Posted: 15/09/2015 at 23:50
Atoll, my first thought was did you enrich the soil for your rose? Perhaps also wnere the scabious is planted too?
rich soil will produce bigger plants. A couple of years ago I made a new border from an old pond. Lots of organic matter. Everything grew...and I mean grew. Plants still grow much bjgger there.
this spring I prepared a site for a rose and enriched the whole site. Same thing....very tall rose and very tall surrounding plants.
knautia macedonica doesnt normally grow that tall. It is in the same family as scabious...I think.....but is a much more vigorous plant. 4' maximum for me though.
Atoll, try giving your plants the chelsea chop.....cut by half or one third and you will have a sturdier and shorter plant.