At one point in time, perhaps a decade ago, I had about 200 species and cultivars of Sempervivum and Jovibarba. The idea was to create a patchwork quilt garden of colorful semps. But of course, with my ridiculous schedule, my potted semps eeked out a meager living in pots too small, languishing frrom utter neglect, and sadly I lost many (most) of them over the years, and some that I still do have the labels are lost or worn off... grrrrrr.
A few years ago an offset from a tray of potted Sempervivum cultivars dropped off into a gravel "drip strip" under the roof overhang, the semp doing very well there and growing into a pretty clump. But I don't what which one it is, although I seem to recall a red ciliate one called 'Maigret', maybe that is its name.
Comments
Richard T. Rodich
Re: Sempervivum
Wed, 04/04/2012 - 6:43pmYes, grown from seed collected at the Minnesota/South Dakota border.
cohan (not verified)
Re: Sempervivum
Wed, 04/04/2012 - 9:48pmNice ones :) I just have some tiny seedlings ..
Trond Hoy
Re: Sempervivum
Wed, 04/04/2012 - 11:58pmRick, the cacti fits very well with the semps! I have to try that at my summerhouse ;)
Mark McDonough
Re: Sempervivum
Thu, 04/05/2012 - 12:26pmI agree, Rick, that's a great looking trough, really like the S. arachnoidium type dangling some baby chicks.
The semps are plumping and coloring up here :)
Mark McDonough
Re: Sempervivum
Thu, 04/05/2012 - 7:45pmCohan, good to see that the snow has receded enough for some peeks at your semps, soon they will be plumping up and taking on strong color.
It is still a bit early for semps here, but they're starting to show color. In one of my planters in particular, Jovibarba heuffelii 'Gold Bug' is brightening up, as are the sempervivum neighbors. Here are a few early shots. The yellow and red-tinged one is the Jovibarba, the green and purple-brown tipped one is Sempervivum pittonii, and the amber red one is S. 'More Honey', a favorite.
Richard T. Rodich
Re: Sempervivum
Thu, 04/05/2012 - 8:52pmShowing lots of color, Mark. You're right, that is Sempervivum arachnoides 'Minus' in my trough. In another couple weeks it will look like this:
And a month and a half or so, like this:
cohan (not verified)
Re: Sempervivum
Fri, 04/06/2012 - 10:54amLooking good Mark and Rick;
Mark, really love the heuffelii, haven't tried any here yet....
We had another 15cm or so of snow wed night/thurs morning, and some more flurries last night.. semps are bare again already, though some other beds are still deep.. last night was -11C or so -quite impressive that these plants are already showing signs of life!
cohan (not verified)
Re: Sempervivum
Sun, 04/29/2012 - 1:24pmFinally managed to get some fairly accurate pics of some dark semps, they can be tricky to photograph! These are all from my plants received from Europe as 'lost-label', and planted in a new bed last fall after a couple of years in community pots..
Trond Hoy
Re: Sempervivum
Mon, 04/30/2012 - 1:02amI think these are the darkest I have ever seen!
cohan (not verified)
Re: Sempervivum
Mon, 04/30/2012 - 11:41amThey are dark ;D Of course it varies through the year, depending on conditions, and I'm wondering if it varies even on a smaller scale- after a day of scattered light showers, and more rain overnight, they seem slightly less dark today, though I didn't have time to really look.. next I have to capture some of the really red ones!
Richard T. Rodich
Re: Sempervivum
Thu, 06/14/2012 - 9:04pmSempervivum arachnoides var. bryoides and S. arachnoides x S. pittonii
cohan (not verified)
Re: Sempervivum
Fri, 06/15/2012 - 12:24amI like the pink ones :) You are just a little ahead of me- I have an arach in bud, along with ciliosum..
Richard T. Rodich
Re: Sempervivum
Mon, 06/25/2012 - 8:58pmSempervivum arachnoides 'Minus' has very small rosettes and is great for a trough. Blooming behind is Sempervivum 'Red Ace'.

Has anyone had this happen before?

Here you see normal stalked Red Ace flowers and one that has almost no stalk.
Mark McDonough
Re: Sempervivum
Sun, 07/01/2012 - 6:00pmYes, it seems quite common to get nearly stalkless flowering on semps sometimes, not sure why. Here is Sempervivum 'Brock' with flowers developing right at rosette level, the photo taken today.
Also flowering, is S. pittonii, one of the better ones for flowers and stalks in proportion to the neat rosettes. It rarely flowers, so I'm happy to notice a couple stalkd today.
Noticed today that Sempervivum 'Noveau Pastel' is showing three rosettes that are going to bloom. This one almost never blooms. I might collect the seed and grow on seedlings on this one, there are so few semps with this coloration; all spring the warms tan-coffee brown color has been a delight, it is now turning a chartreuse-tan color. Behind it is Jovibarba heuffelii 'Torrid Zone' that is about to flower, this is perhaps the showiest of the heuffelii cultivars.
Rick, I said it before, but I'll say it again, I really like your refined trough with S. arachnoideum and others, including hardy cacti. :) Is the cross S. arachnoideum x S. pittonii one of your own making? I'd like to see what the rosettes look like.
Trond Hoy
Re: Sempervivum
Mon, 07/02/2012 - 3:51amYou really have some nice semps, Rick and Mark. Mine have almost disappeared the last years due to invading grass and other plants, and flowering. Some seems to almost flower itself to death, like this one: (Sorry for the bad picture but my camera is dead and my wife's is out of power!)
Nameless as usual, but this time it isn't my fault. The semps for sale here have almost never names and many of my plants are old "heirlooms" without names too.
Regarding short flower stalks I have noticed that this sometimes happens when a rosette in vigour growth suddenly change mind and starts flowering in stead of continuing growth. The rosettes due to flower are usually initiated very early in spring.
Richard T. Rodich
Re: Sempervivum
Mon, 07/02/2012 - 2:21pmThen I suppose breeders have already taken seed from these short anomalies in hopes of manifesting the trait, but without success. what a pity...
No, I bought it just this spring. The company sent a few rosettes which I planted up, and they are still growing in a rather shaded location, so I am not sure the form (or color) is completely true. I had planted some starts of S. calcareum that are in the same conditions, so I took a picture of both, and had some photos of the same S. calcareum clone in other seasons that might give you a better idea of the cross's characteristics.
S. calcareum and S. arachnoides

S. calcareum in early December and late April.

Richard T. Rodich
Re: Sempervivum
Mon, 07/02/2012 - 7:36pmSempervivum 'Jestor' is aptly named with the apple green and red coloring. I think it is the best one I have for holding its colors in the adverse conditions of heat and drought stress.
Trond Hoy
Re: Sempervivum
Tue, 07/03/2012 - 10:45pmRick, don't they all keep some colouring during summer? Those I have do although I can't say we experience heat stress - drought maybe, but heat, what is that :-\
cohan (not verified)
Re: Sempervivum
Tue, 07/03/2012 - 11:00pmTrond, no heat stress here either, and no drought the last couple of years! Its pouring now, again, but supposed to be dry for a few days after this, and we may even hit 30C by monday- if so, it would be the first time this year...
My semps have kept good colour all year in these last few cool years- I haven't been back here for a warm dry summer yet- not sure if we will ever have one again ;D My dark reds are still very dark, and several are coming into flower now..
Rick, my S ciliosum, which flowered on something like 7 or more stalks last year (on fewer square inches than that) later in the season also produced some very short flower stems, below the still flowering tall stems; I figured those new ones just didn't have the energy anymore to be taller! amazingly, that clump of ciliosum totally filled in around those dead rosettes so you can't even see any gaps, and is flowering again this year on about 4 stems, impressive plants for monocarpics!
Mark, I like the brownish ones too, I have one tiny no name which is quite brown in spring, though less so in its summer colour...
Richard T. Rodich
Re: Sempervivum
Wed, 07/04/2012 - 8:35amActually Red Ace is also holding its color well here, but other mostly reds like Noir and Maigret are now mostly green. In general, I would say that all semps here change color from spring into summer. At least for me. I've always said I am not a very attentive grower of anything, and semps receive a lot of neglect. They are one of the last on my list to be sheltered from hot sun, since that space is rather limited. We are in our ninth day in a row with high temps in the mid 90's (35C) and lows above 70 (21C), with high humidity.
compare these photos of 'Robin' and 'Minus' in the left front corner of the same trough:
29 April
http://nargs.org/smf/index.php?action=dlattach;topic=182.0;attach=20252;...
25 June
http://nargs.org/smf/index.php?action=dlattach;topic=182.0;attach=34718;...
cohan (not verified)
Re: Sempervivum
Wed, 07/04/2012 - 10:48amMost of my semps also change colour, though it may be a less extreme change- my semp bed still has lots of stron gcolour (I'll try to take some new pics today, then maybe some more next week after we are supposed to actually have some warm sunny weather).. there is also, for some, a strong change in form- ciliosum and arachnoideum don't change much- they stay tightly closed all year here, but others go from tightly closed to quite open....
My challenge is the opposite of yours- I have to think hard about what plants to give the few mostly fully exposed sites I have, and try to acquire plants which are okay with only a half day of sun, or better yet, dappled sun! I doubt heat stress is a factor for many plants here- even on the warmest days my nights are mostly cool- we have days of 28-30C forecast sunday to tues (82-86F and by far the warmest we've had this year) and the warmest nights are 10C/50F.. Today is only supposed to get to 13C/55F and tonight down to 2C/35F.. guess those coloured semps are in no danger...lol
Mark McDonough
Re: Sempervivum
Sat, 07/07/2012 - 8:10pmRick, your Sempervivum 'Jestor' is a nice lively color combination, I like it.
Looking around the garden today, I noticed how Jovibarba heuffelii 'Gold Bug' has changed into its summar garb, thick leaves of orangish-tan on the outer leaves, with a glowing lime center.
An updated view of Sempervivum 'Brock' with anomalous stemless flowering.
Sempervium ciliosum var. borisii in summer becomes eye-catching white-chartreuse in appearance, among my favorite species.
Jovibarba heuffelii 'Torrid Zone' (earlier I said this was 'Hot Lips', should depend more on labels than on memory), ready to flower, with S. ciliosum var. borisii on the left and S. 'Nouveau Pastel' on the right.
Lori S. (not verified)
Re: Sempervivum
Sat, 07/07/2012 - 9:43pmDon't sweat it too much.... they're not fussy plants and will grow pretty well anywhere. I have some semps under trees where they don't get as much light as they might wish for, however, they do cover the ground and look decorative, nonetheless.
cohan (not verified)
Re: Sempervivum
Sun, 07/08/2012 - 1:49pmI wasn't thinking so much about the Semps, which are mostly growing like gangbusters ;D and because they are among my faves they are getting some of the best spots- right in front of the house where they can be appreciated the whole time they are not covered with snow!More so some other things that I might like to grow that I worry about enough light for, oh well! One can always try, and no site can grow everything :) I do, though, on seedlists, lean to things that say north or east slopes, or under shrubberies, forest clearings (a term that describes most of my gardening area!) or at least amongst other forbs and grasses.. a lot of semps in nature have those semi-sheltered spots too- with grasses around, edges of trees etc..
Lori S. (not verified)
Re: Sempervivum
Sun, 07/15/2012 - 9:21pmSempervivum thompsonianum, or so it was said to be:

cohan (not verified)
Re: Sempervivum
Sun, 08/26/2012 - 11:38pmSome semps from today, these are mostly from the same batch received several years ago as lost label, and planted in ground last year
cohan (not verified)
Re: Sempervivum
Sun, 08/26/2012 - 11:40pmAnd another batch..
Trond Hoy
Re: Sempervivum
Tue, 08/28/2012 - 12:48pmWell, Cohan, you have a nice collection there!
cohan (not verified)
Re: Sempervivum
Tue, 08/28/2012 - 10:31pmThanks, Trond- that's not all of them, either! But I know compared to the real collectors, I have very few.. Some of them are quite prolific, too- I started with two small batches of tiny offsets I was sent several years ago, and I now have two new rock beds with mainly semps in them, and still have many leftovers in pots! I can already imagine the first bed, planted last year, will have little empty space between the plants in another year or two...
Trond Hoy
Re: Sempervivum
Thu, 08/30/2012 - 7:49amLooks good anyway and you do have some pebbles too ;)
I remember collecting stamps in my youth - I always had less than the real collectors - as with plants. Like here at the forum, it's always someone with more (and better) plants than yourself :o
cohan (not verified)
Re: Sempervivum
Thu, 08/30/2012 - 12:45pmAnd the serious collectors of course tend to be very focussed- I could never settle on one category of plants, let alone a genus ;D
Trond Hoy
Re: Sempervivum
Thu, 08/30/2012 - 1:13pmI can never be serious either; not to talk about focussed ;D
cohan (not verified)
Re: Sempervivum
Thu, 08/30/2012 - 3:36pmWhat were we talking about? ;D
cohan (not verified)
Re: Sempervivum
Sun, 10/07/2012 - 12:41pmSempervivum 'Rhodenicum'; photo taken Oct 04, 2012, our heaviest frost so far this year, -5 to -9C; this is in my new named Semp and Alpine rock garden, in front of the house..
Richard T. Rodich
Re: Sempervivum
Sun, 10/07/2012 - 6:39pmActually, the plant in the upper left caught my eye...
cohan (not verified)
Re: Sempervivum
Sun, 10/07/2012 - 9:17pmLOL- that's why I usually label my photos with every plant clearly visible in them- but I thought that one was far enough back to ignore! its a Polemonium boreale seedling.. I'll show some better pics in another thread...
Trond Hoy
Re: Sempervivum
Mon, 10/08/2012 - 1:13amI had probably not noticed it if you hadn't mentioned it, Rick!
cohan (not verified)
Re: Sempervivum
Wed, 10/10/2012 - 2:03pmA few more shots from a few days ago.. these are all planted in my new named semps etc bed in front of the house
1 Jovibarba (globifera) allioni Gorges Superieures de Cians, Fr
2 Jovibarba (globifera) hirta Belianske Tatry, Slovakia
3 Sempervivum x pomellii Chastel sur Murat, Fr
4 Sempervivum marmoreum erythraeum Pirin, Bulgaria
5 Sempervivum marmoreum erythraeum Pirin, Bulgaria
Richard T. Rodich
Re: Sempervivum
Wed, 10/10/2012 - 7:05pmThe only "rosularia" I ever had turned out to be Sedum pachyclados (!)
I am pleased to say that I now have a Jovibarba that rivals your luscious species form, Cohan.
Jovibarba allionii f./Esteng x J. hirta f./B. Karpaty

Sempervivum arachnoides 'Minus', putting on its winter coat.

Trond Hoy
Re: Sempervivum
Thu, 10/11/2012 - 10:59amNice plants both of you have!
I am at my summerhouse at the moment, to do a job, but am disappointed when inspecting my plants. A herd of sheep has been grazing here all fall and damaged a lot. The owner does know about it but doesn't a damned thing about it >:( >:( >:(
cohan (not verified)
Re: Sempervivum
Thu, 10/11/2012 - 11:43amThat is a nice Jovi, Rick :)
Trond, sorry to hear, that's a tough situation, esp since you are not there full time :(
Trond Hoy
Re: Sempervivum
Sun, 10/14/2012 - 11:44amYes, I really am angry >:( I (and everybody else here) have talked to him several times and he always says he can't find out where the sheep (more like goats) escape (my niece found the place - they climb a steep rocky wall).
cohan (not verified)
Re: Sempervivum
Sun, 10/14/2012 - 10:39pmIf he lives and farms there full time, it seems like maybe he does not consider part time residents with only display gardens very important..
Trond Hoy
Re: Sempervivum
Tue, 10/16/2012 - 1:02pmI think so - he actually lives on the next island and rents the fields of a farm on "our" island.
Richard T. Rodich
How often does this happen:
Sun, 06/23/2013 - 7:37pmHow often does this happen:
I have multiple flower stalks growing from the same rosette....
Lori S. (not verified)
That does seem odd - can't
Sun, 06/23/2013 - 8:03pmThat does seem odd - can't say I've seen it!
cohan (not verified)
Rick- at least your plant
Thu, 04/17/2014 - 12:07pmRick- at least your plant above had lots of offsets, so flowers or not, it should be good still :) I've had S ciliosum produce a lot of flowering stems, including some small ones like that, but can't say I looked closely enough to know whether they were from the same or multiple rosettes. The overall growth was so dense (packed in between rocks and pot edge) that the heavy flowering and subsequent rosette death, made little impact on the clump overall! I do have pieces of that clump in ground now (actually now it all is, the pot was disassembled, but that main chunk is still establishing) and initially they send out rosettes (still talking about ciliosum here) on longish -couple of inches from parent- surface stolons.. I guess it will start getting packed in when the open space between rocks is exhausted..
Here are a couple of views of plants just recently out of the snow-off and on!
Jovibarbas have to be some of the toughest plants in the rock garden re: low temps- I see some of them looking alert almost as soon as the snow is off, when nights are well below freezing still, and some of the days not much better.. this is a no-name plant, prob a J globifera form, in ground, then a potful of extra Jovis..
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