Try moving the rose plant in its pot near to a Tulasi or Vetiver (wala in Marathi).
Once when I had to go on a few weeks vacation, had moved a rose plant pot to a vetiver bush. Later when I came back, I saw that the rose plant leaves were clean and shining, and two beautiful roses bloomed. See picasaweb.google.com/1167245459 … etiverBush
If the problem is from the soil (nematodes, etc) then I cant see how moving the pot to a Tulasi bush will work. Maybe you can try, placing Tulasi, Neem leaves in water for a few hours and use the water for the rose pot.
This is an amateurish advice. Just try it and report what happens.
Cheers
k vinod kumar
Is it getting enough sunlight?
Why is soil wet without watering? Is the drain hole at the bottom of the pot plugged and somehow excess water is not able to drain out?
I would remove the mulch.
It appears like a nematode infestation, coupled with nutrient deficiency. Try re-potting the plants and add plenty of neem cake powdered ( de-oiled)
Good compost from a trusted source to be used along with a potassium source ( for veggies- potash, for others bone meal - handfull, some say a banana peel in the pot helps)
Happy blooming !