If there was ever a rollercoaster experience for a particular rose, this would be one. I have also had a very similar report from my cousin with this one who lives 3000 miles away. GB has a serious vigor issue. Apparently it doesn't appreciate the heat of Central California, and it doesn't appreciate humidity here in Hawaii. Unassumingly, it started out great in the springtime here, and at first seemed to tolerate the rain. Then the flowers started getting mildew on the undersides of the peduncle. Then, after 3 days of rain, I started noticing BS. It did quickly drop it's foliage, then it regrew somewhat quickly. I noticed it doing this about 4 times during the year. Each time, the new canes that it sent up become smaller and smaller. Meanwhile, Alfred Sisley (a very similarly yellow/red striped floribunda) flourishes and blooms nearly non-stop.
GB seems to have a very infrequent and low flower count, due to it's lack of robustness. Given Blood/Bone Meal, 4-10-10 slow release fertilizer, and Alfalfa Meal. I've never seen a rose act negatively toward Alfalfa, but this is a first.
My cousin reports that hers ended up completely naked with just 4 spindly flowers that barely held on till they opened. She relented and began spraying. Lo and behold, that was the ticket. Hers seems to be doing twice as well now that she began using Bayer 3-In-1 Systemic. So, this rose apparently is an Unsuitable cultivar for those who want a No-Spray Rose. This is a No-go. It requires sprayed for its diseases and for it to flourish, due to high humidity or any amount of heat. Alfred Sisley is a very good substitute for this one in my opinion. AS does not require much care or fuss, and it reliably blooms and is vigorous with just the standard nutrients, mulching, and a little alfalfa meal once in a while.

The Zone 3b rating must be a mistake? It seems highly unlikely for this type of rose.

The most wildly striped rose I own, and I mean that in a good way. George Burns’ stripes are especially bold and splashy, and they stay that way even in the hot summer, when many other stripes become too muted. The plant is more a little hybrid tea than a floribunda, very upright, large blooms sometimes almost five inches. It blooms well and holds size all season. The fragrance is excellent too , a strong rose and citrus. About the only fault is that it’s a bit fleeting, but overall I’m very happy with this one.