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'Alba Semi-plena' rose Reviews & Comments
Discussion id : 47-627
most recent 23 MAR 18 SHOW ALL
Initial post 24 AUG 10 by Azalea House Flowering Shrub Farm
Horticulturally we recognize that all roses evolved where flowers sported or descended from single to semi-double to double flowered varieties. So we know that Rosa centifolia is descended from a single flowered variety even though that ancestor is extinct. In a similar fashion we must know when presented with two roses; alba semi-plena and alba maxima that maxima must be a sport of semi-plena especially when both roses sport the other regularly. So why does HMF show semi-plena as a sport of maxima and not the other way around as well? My contention is that they are both sports of each other.

Which came first? The chicken or the egg.
Reply #1 of 5 posted 25 AUG 10 by jedmar
The parentages are based on the cited references from rose literature. These show semi-plena as a sport of Maxima. But you are right, both roses have been around such a long time (see reference if 1629) that we do not know which is the original type.
Reply #2 of 5 posted 25 AUG 10 by Azalea House Flowering Shrub Farm
Thank you for replying. I think its important to note when rose literature conflicts with other possible sources like horticultural science. Hundreds of years ago roses that were considered inferior were expunged everywhere which no doubt resulted in the extinction of many varieties such as the original five petaled Rosa centifolia. The literature could have been changed as well. We'll just have to wait and see if DNA analysis can determine which came first. Not that it matters except from an purely intellectual perspective.
Reply #3 of 5 posted 26 AUG 10 by Margaret Furness
Yes, I keep wishing we could do DNA analysis on such-and-such a rose, and then I remember that a third of the world doesn't have clean drinking water, and HMF lists 80,000-odd rose cultivars.
Reply #4 of 5 posted 26 AUG 10 by Azalea House Flowering Shrub Farm
Much of the world could have clean drinking water except that so many governments of the world don't seem to consider it important. Rose DNA analysis I think will take a whole lot less time. Damning isn't it? I was investing in a company that planned to provide clean drinking water to countries in need all over the world but it failed due to the recession. DNA analysis of 80,000 cultivars of rose though, I believe there would be much less resistance to funding that.
Reply #5 of 5 posted 23 MAR 18 by AquaEyes
This is admittedly very late, but I must say that it is certainly not unheard of for a seed-borne double-flowered rose to sport into a semi-double form. The most obvious which comes to mind is 'Souvenir de la Malmaison' sporting to 'Souvenir de St. Anne's'. So while I understand the reasoning that single is the default over double with regards to wild species, the same is not necessarily the case with cultivated varieties.


Discussion id : 103-803
most recent 1 AUG 17 HIDE POSTS
Initial post 1 AUG 17 by Sambolingo
Available from - Old Market Farm
Discussion id : 15-035
most recent 18 NOV 06 HIDE POSTS
Initial post 18 NOV 06 by Starling
This is a striking rose.  Blue-green  foliage and clean-white blooms.  Although blooming only once, the surge is one to anticipate.  The golden stamens amid the clear white semi-double petals make a refreshing presentation.  The bush is robust and will not require coaxing.  Foliage is disease resistant and is one of the shrub's best attributes.  It is good against a fence or wall.  Prune after bloom to promote new growth for next year's blooms.
Discussion id : 354
most recent 19 MAY 05 SHOW ALL
Initial post 25 FEB 04 by Unregistered Guest
I planted a bareroot semi-plena last year. It grew happily and to extraordinary height, yet produced no flowers :*(
My question: does this type of rose need to reach a certain age until it starts blooming?
Thank you so much for your time!
Reply #1 of 2 posted 25 FEB 04 by Unregistered Guest
This rose blooms on last year's wood. The branches it grew last year should have flowers on them this year. That's why it's recommended that you wait to prune it (except for taking off dead wood) until after it blooms, unlike the hybrid teas.
Reply #2 of 2 posted 19 MAY 05 by Unregistered Guest
I'm going into my third summer with my Alba Semiplena, and it didn't bloom the first two years either, despite growing happily; this year it's full of buds. I think it just likes to take time.
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