The rose is old, like Michael said, so you will have to work it a little in order to coax more growth out of it. Here is my advice, as I've dealt with this a few times.

#1- Don't jump to chemical fertilizers right away. I would apply a one to one ratio of compost/cow manure with top soil and mound it over the bud union to see if you can get the plant to root on its own roots.

#2- Cut back the cankered/bs areas.

#3- Spray your plant with fungicide and mix in a little Superthrive and fish emulsion.

#4- Ferment some Alfalfa pellets in a bucket for about one to two days and water the rose after applying the new soil to the base (this will hopefully spur on new basal breaks).

#5- Water the plant every other day.

In my experience, this regimen has brought back several roses from death's grip. Judging by the health and growth of your Lavender plants, I don't think you have a major root issue, so your best bet is to feed the plant more. Like I said, don't jump to chemical/granular/water soluble fertilizers. That was my first instinct the first few times I saw this kind of issue, and it just made the problem worst and accelerated the death spiral.

Good luck and please let us know how it went.

-Adrian

Thank you very much!! You are correct, it is apparently 15 years old and has never been fertilized! Should I still cut the cancered areas when that means cutting it down to the ground since it seems dead there?

As I said above, cutting it down to the graft (which seems to be at grade level) could regenerate it or could kill it. The base of the main cane is not cankered or dead, it is just gnarly from old age. The cankers are on green bark.

If this rose is a hybrid tea it may very well be nearing the end of its life span. There's nothing wrong with using the measures suggested above, but there are many excellent roses available, and it doesn't have to be another hybrid tea. Floribundas have a leafier, bushier habit and you might want to consider just starting over with a new, healthy rose, using some of the suggestions above to get the maximum bloom and growth from it.

Ahh ok! Now I get it, thank you Michaelg :) And thanks to you all for the answer, think I will try to cut it down to the graft. Thinking maybe I should wait with that til spring? If it kills it, it's probably better to replace it

I wouldn't cut it down to the graft. I would half all the green stems and give the rose at least the amended soil.

The best time for really severe pruning is at the end of winter. If you try that now, the bugs or bunnies may get all the new growth, and kill the plant. In my experience, roses regenerate just fine if you take out one or two of the oldest canes, and let the plant replace them with new ones. If it gets too close to winter, the new growth will be very tender, and won't survive winter unless carefully protected. I have protected new growth successfully by burying basal breaks in lots of soil.