Round Up, met its match?

For the last roughly 6 weeks I've been trying to kill off a wild rose that is in totally the wrong place. I've been doing weekly or twice weekly treatments with RoundUp. Everything at the food of the target is dead as a doornail, where the Round Up has dripped off or the spray has missed. In fact I've just burnt it all off with my barbecue lighting wand to I could see what I was working with. The rose bush though was still green when I cut it out. Looking poorly yes, but not looking like it had gone several rounds against Round Up.

 

The rose that I have been getting rid of was also treated with Roundup and it didn't kill that either!!! Either Roundup is not a good as it used to be or it just doesn't work on roses!!!

Val

 

Are you both using ready-mixed sprays? They tend to be over-diluted. Even if you're mixing it yourselves then perhaps it's because glyphosate, the active ingredient, works best on green, leafy plants. It takes up to six weeks to completely kill some weeds.
SBK Brushwood killer might be more effective on roses?

 

I mix it myself from concentrate. I always put slightly more concentrate in than you're supposed to, and it usually makes short work of everything. The rose plant was alive, lush and actively growing when I started the assault. It did end up looking poorly, but not dead. Everything at the foot of it was well and truly deaded.

 

Yep, a rose is tending towards a shrub rather than an herbaceous plant. Like with Brambles, roundup will make the leaves go brown but not kill it.