Mine started off the year with a fungal issue… but after a couple doses of Pristine and Myclobutanil it was completely resolved and they went the remainder of the year without any sprays/treatment at all. There was only a small crop of cherries this year, but they put on a lot of growth and I anticipate a much larger crop next year.
I have 4 Carmine Jewel bushes and one Crimson Passion. The bigger of the two Carmine Jewels each put on maybe two feet of new growth. Crimson Passion continues to under-perform in comparison and is the smallest of the 5 by far, but even it put on maybe a foot of new growth.
I think in another year or two I will be able to give a “real” review of how Carmine Jewel does in Northern VA, but I don’t see any reason to doubt they can thrive here so far.