mylab 123, I love Iceberg. Iceberg roses are repeating very well and are super floriferous. I think they would be perfect for floating in a bowl. In your zone I guess Iceberg would not be taller than 6 feet. I have read that in wet weather black spot can be a little bit of an issue, but when I was growing this rose in Germany (it rains a lot there) it was not too bad.

Coincidentally I have written a post on my garden blog about this rose yesterday with some more info and a couple of photos. Maybe you want to have a look. Just click on the link in the bottom.

Christina

Here is a link that might be useful: Organic Garden Dreams

I have a couple of Burgundy Iceberg and sometimes I can detect a faint scent from the flowers. During cold rainy days, the spend flowers/immature hips tends to get mushy and look very unsightly. So it's good to keep them deadheaded to avoid that.

So far nice floriferous plant and still blooming here in SoCal. I just got them back in December so I can't really say much else.

White rugosa roses such as Blanc Double de Coubert are fragrant and ideal for floating in a bowl.

'Iceberg' is a superb performer in Southern California. Elsewhere it's not the superstar it is here in mild conditions.

Try looked at the newer Kordes like 'Lions Fairy Tale', 'Cream Veranda', and 'Ice Girl', they may be hardier for you in zone 5. Are you near Northland Rosarium in Spokane?--see what they suggest.

mylab 123, Iceburg is one of the nicest roses I have ever grown and reliably produces some of the prettiest blooms you'll ever see. The blooms are just a little on the short-lived side. I am not aware of what a floated bloom should look like but I have attached a couple of photos for you to see.

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Bob

Here in the upper peninsula of Michigan, Iceberg and Climbing Iceberg are at their limits as far as hardiness is concerned so I give them winter protection with a rose cone, dirt and oak leaves. I have replaced Iceberg once due to winterkill. They are beautiful with lots of flowers when the plant is healthy, but since they are a floribunda, the blooms are in sprays rather than individual so you might have to remove the side buds and leave the terminal bud on a selected branch to get that one perfect blossom that you can float in a bowl. Blanc Double de Coubert survives here without winter protection so you might consider it as well.