Available from - High Country Roses
highcountryroses.com

I have had this rose for about 7 years. It is a thorny monster of a rose bush. I don't see how anyone could say it is "mostly thornless." It has snagged me many a time and they are recurved and hard to escape once you get caught.. It throws out the longest canes each season. It grows really well in Zone 7a Provo UT. The cold doesn't bother it, warmer parts of the plant still have green leaves despite temps that got down to single digits. This plant is a blooming machine, heat doesn't bother it, neither does cold. Mine makes masses of hips. Interesting thing, I tried a ripe one this fall and it was tasty. It tasted very fruity. Considering this plant makes hundreds each season, I'm going to make some jam. If you grow this one, taste a hip when it is a bright orange-red and slightly soft. You can taste the vitamin C in it!

I thought I reviewed this one years ago. Guess not.

I grew it for 3 years, from the year it was introduced. In my climate, it failed to climb, and was very stick-like. I grew Candy Land around the same type, which I felt was far superior and an easy rose. I eventually dug up NO, because it didn't bloom a lot in my climate, and it just wasn't worth the effort. The other Weeks purples are bloom machines here, which I already grew, so growing NO was rather pointless.

It didn't really get disease, and the stems were healthy. It was simply a vigor and growth architecture issue.

I grow Stormy Weather now, which I love, and find far superior.

Agree with Jasminerose that Night Owl is far, far from thornless. It has large backward facing thorns; if it grabs you it is difficult to escape.
Canes are stiff so training can be a challenge; especially with those thorns!