Rosefolly,

Would you consider instead:

1. Alba Maxima - no repeat like Alba semi-plena, little bigger bloom at 3.25", 40-75 petals, listed for zone 3b, in stock at Heirloom, $63.00

2. Dimitri - Brad Jalbert rose, repeats, 3" bloom, 25+ petals, not as fragrant as Alba Semi-Plena, just mild, in stock at Heirloom, $60.00.

3. Rise Up Lilac - Proven Winner line, 5-8', exceptional fragrance, repeats, zone 4, in stock at Heirloom, $60.00.

These all seem to have similar growth habits like Alba semi-plena.

Moses.

Greenmantle Nursery has it on Marissa's list.

Sheila, Marissa at Greenmantle does list Alba Semi-Plena, but like everyone else at this point has it on a waiting list. Apparently it is extremely difficult to get it to strike on its own roots.

Moses, thank you for the kindly suggestions. I actually specificially wanted Alba Semi-Plena. I have a couple of other albas as well, specifically Armide and Jeanne d'Arc (the alba) For a number of reasons, I want to include some of the historic once-bloomers in my small garden. As for Alba Maxima, it is a bit too large for the spot I have in mind, and not so fragrant as Semi-Plena.

I did find a nursery in Maine that has it for sale, but alas, they do not ship.

In my experience, Alba Maxima and Semi-Plena are pretty much identical in size.

Rosefolly,

You sure know what you want! You never know how and when an Alba Semi-Plena will fall into your lap. In the world of roses, the unusual is the norm. Keep your eyes open and your hopes up!

In the meantime, that nursery that doesn't ship may be begged/pleaded with to do so. Don't take no for an answer. How hard is it to pack a rose and send it? Not very. Present your case as humbly and earnestly as possible and a true rose lover would not refuse you. I wouldn't. And remember, money talks.

Moses.

I thought there was a non-rose PNW nursery that carried it like Cistus or Forestfarm, but that doesn't seem to be the case. I got mine from Rogue Valley a long time ago, and it's still plugging along, but not truly happy here.

It's a shame someone who grows it can't offer a rooted sucker to the original poster. That's one of the easiest ways to propagate these types of OGRs. There would still be the potential of "sharing" pests and diseases but without the potential of losing business licenses due to shipping uninspected nursery stock.

It is the type of rose that shows up in odd places, like shrub nurseries or herb farms.

I was just browsing Rose Farm Canada's site and in their FAQ section, they offer a 20% off coupon for High Country Roses. Rose Farm doesn't ship to the US but they partner with High Country. https://rosefarmcanada.com/faq/ 

I guess I could volunteer a sucker but would it be legal/okay to mail from California? Here is a candidate:

"Legal"? Without knowing whether your area is under a pest quarantine nor what Colorado's Ag requirements are, that's difficult to say. I'd imagine, though, the chances of spreading something undesirable from California to Colorado would be less than vice versa due to climate. There, "winter" will kill whatever the issue may be. Here, there really isn't a "winter" to freeze any pests out.

RBEHS Z10A/S17,

If you are under a quarantine, you are not allowed to move plant material outside of your local area. You could easily find out one way or another by checking your local Master Gardener website or county extension website.

If you are not under quarantine, and if you are willing to ship it, I would be delighted to discuss this off the Antique Roses site. and of course, would happily pay for the shipping. If you click on my user name it should take you to a link to email me.

As for us, we currently have quarantines against Japanese beetles and Emerald ash borer, both already present here. Without knowing exactly where you live, I would be surprised to learn of either pest in the area I think you are.

Rosefolly in zone 5b

It seems I'm in a Asian Citrus Psyllid quarantine zone, but I don't think that applies to roses. I'll message you.

Yes, the only citrus here would be as houseplants!

@Rosefolly z5 I messaged you via Houzz, but not sure if you received.

No, I did not get any message

Okay, I tried again. I am clicking on the message box when I click on your user name.