Sempervivum and Jovibarba forum: Sempervivum 'Rubrum'

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Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Apr 14, 2016 10:48 AM CST

Moderator

Time for a discussion on S. 'Rubrum'.
We seem to have more than one type showing in the database. In just a few minutes of research I see there are more than one semp sold under this name.
Every one put your sleuth hats on and see what you come up with.

This may be part of the problem. http://garden.org/plants/search/text.php?ppid=186377&q=rubru...
Name: Margo
Ohio (Zone 5a)
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ravenpickers
Apr 14, 2016 5:09 PM CST
This is my rubrum. It says arachnoidum var. rubrum. It's not the best right now. It's still semi dormant and needs to be cleaned up, but here it is.



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Name: Kevin Vaughn
Salem OR (Zone 8a)
JungleShadows
Apr 14, 2016 6:05 PM CST
Lynn, I think the term 'Rubrum' has been used for several things. In my youth it was the reddish form of montanum, that was probably one of the parents of of 'Cleveland Morgan'. Probably a cultivar name that simply means RED is not a good one in a group of plants where we have several thousand that could be called that.

Kevin
Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Apr 14, 2016 6:06 PM CST

Moderator

And it's very tiny isn't it Margo? Looks like mine. And I think Dirt has the same one.
Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Apr 14, 2016 6:29 PM CST

Moderator

We cross posted Kevin. I see what you mean, there are several going by that name.
I find this tiny one is being sold by:
Mountain Crest http://mountaincrestgardens.com/sempervivum-arachnoideum-rub...
SMG http://www.smgsucculents.com/sempervivum%20arachnoideum%20va...
Monrovia http://www.monrovia.com/plant-catalog/plants/3352/red-cobweb...
Wrightman Alpine Nursery https://www.wrightmanalpines.com/all-plants/sempervivum-arac... https://www.wrightmanalpines.com/sites/wrightmanalpines.com/...

Nargs has it featured: https://www.nargs.org/photo/sempervivum-arachnoideum-v-rubru...

I also have found French sites that show this same tiny arach. They all look to be the same plant with the same name at different times of the year.
Name: Kevin Vaughn
Salem OR (Zone 8a)
JungleShadows
Apr 14, 2016 8:11 PM CST
and frankly none of those seem any more red (in fact much less red) than 'Emberly Pink'.

Kevin
Name: Margo
Ohio (Zone 5a)
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ravenpickers
Apr 14, 2016 8:53 PM CST
Yes, it is tiny, Lynn. That's another one that's about 1/2" full grown.
Name: Jo Ann Mc Brayer
NW Oregon (Zone 8a)
Sempervivums
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ricos
Apr 27, 2016 9:40 PM CST
Great discussion
Here are 2 that I have
first one is labeled Sempervivum arachnoideum rubrum...just like nargs picture...which I have always thought was a species because of the small r in rubrum. Perhaps it should be subspecies rubrum
The second one is just sempervivum Rubrum as if Rubrum is a cultivar name. I have no idea how long this variety has been around. As Kevin says ..there are so many red ones now that the name seems almost silly but maybe it is very old. Does it look like anything you remember Kevin ?

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Name: Kevin Vaughn
Salem OR (Zone 8a)
JungleShadows
Apr 28, 2016 7:20 AM CST
There is another one that is a montanum too. That was the one from my youth. I'm sure it was involved in 'Cleveland Morgan' as it was like a smaller less red version of CM.

Kevin
Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Apr 28, 2016 8:17 PM CST

Moderator

Nice photos Jo Ann.
Name: Jo Ann Mc Brayer
NW Oregon (Zone 8a)
Sempervivums
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ricos
Apr 30, 2016 8:42 PM CST
Thanks Lynn. That's my now famous camera Hilarious!
Kevin, my Cleveland Morgan is not as red as either of these. Breeding has vastly improved color hasn't it. I saw a few beautiful lime and chartruse semps in your beds. do yoou think that breeding for those colors is a worth while project. Perhaps I am off topic here and this is not appropriate discussion for this thread. ?
Name: Lynn
Dallas, OR (Zone 8b)
Charter ATP Member Garden Sages I helped plan and beta test the plant database. I helped beta test the Garden Planting Calendar I was one of the first 300 contributors to the plant database! Plant Database Moderator
Forum moderator I helped beta test the first seed swap Celebrating Gardening: 2015 Plant and/or Seed Trader Garden Ideas: Master Level Sempervivums
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valleylynn
Apr 30, 2016 8:45 PM CST

Moderator

Jo Anne, you can start a new thread anytime you want to start a new topic concerning semps.
Use the Search box on the home page of the Sempervivum Forum to see if the topic has already been discussed, if not just start a new topic. Thumbs up
Your above post would be a great topic to pursue.

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