Sempervivum

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RickR
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Joined: 2009-09-21

Sempervivum arachnoides var. bryoides and S. arachnoides x S. pittonii

       

Rick Rodich    zone 4a.    Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA

cohan
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Joined: 2011-02-03

I like the pink ones :) You are just a little ahead of me- I have an arach in bud, along with ciliosum..

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

RickR
Title: Moderator
Joined: 2009-09-21

Sempervivum 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.
       

Rick Rodich    zone 4a.    Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA

Mark McD
Title: Moderator
Joined: 2009-12-14

RickR wrote:

Has anyone had this happen before?
Here you see normal stalked Red Ace flowers and one that has almost no stalk.

Yes, 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.

Mark McDonough
Massachusetts, USA, near the New Hampshire border USDA Zone 5
antennaria at aol.com
 

Hoy
Hoy's picture
Title: Member
Joined: 2009-12-15

You 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.

Trond
Rogaland, Norway - with cool, often rainy summers  (29C max) and mild, often rainy winters (180 cm/year)!

RickR
Title: Moderator
Joined: 2009-09-21

McDonough wrote:

RickR wrote:

Has anyone had this happen before?
Here you see normal stalked Red Ace flowers and one that has almost no stalk.

Yes, it seems quite common to get nearly stalkless flowering on semps sometimes, not sure why.

Then I suppose breeders have already taken seed from these short anomalies in hopes of manifesting the trait, but without success.  what a pity...

McDonough wrote:

Rick, is the cross S. arachnoideum x S. pittonii one of your own making?  I'd like to see what the rosettes look like.

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.
       

Rick Rodich    zone 4a.    Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA

RickR
Title: Moderator
Joined: 2009-09-21

Sempervivum '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.

             

Rick Rodich    zone 4a.    Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA

Hoy
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Title: Member
Joined: 2009-12-15

Rick, 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 :-\

Trond
Rogaland, Norway - with cool, often rainy summers  (29C max) and mild, often rainy winters (180 cm/year)!

cohan
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Title: Guest
Joined: 2011-02-03

Trond, 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...

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

RickR
Title: Moderator
Joined: 2009-09-21

Hoy wrote:

Rick, 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 :-\

Actually 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;...

Rick Rodich    zone 4a.    Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA

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