Search found 1175 matches

by Karl K
Mon Jul 22, 2019 7:07 pm
Forum: Rose Hybridizers Association Forum
Topic: Roots - the neglected part of breeding roses
Replies: 39
Views: 4250

Re: Roots - the neglected part of breeding roses

I did a preliminary search through the articles on my web page, then made a biblio of references to soil preferences ... and related matters. http://bulbnrose.x10.mx/KKing/Roses_Soil.html I've never had to deal with soil that is almost constantly moist, but if I should ever have to face it I'll know...
by Karl K
Sun Jul 21, 2019 1:38 am
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 1
Views: 74

Re: Why some crosses fail

In some hybrids, there is a problem with endosperm development. I don't know that this occurs in roses, but I did find a paper with pics of Rosa roxburghii embryo and endosperm development.
http://bulbnrose.x10.mx/Roses/breeding/ ... i1987.html
by Karl K
Fri Jul 19, 2019 10:04 pm
Forum: Rose Hybridizers Association Forum
Topic: Roots - the neglected part of breeding roses
Replies: 39
Views: 4250

Re: Roots - the neglected part of breeding roses

Adaptiveness of roots can involve the production of specific substances that are excreted from the roots to aid in extracting minerals. In lime-rich soils, plants may exude di- and tricarboxylic acids; the former liberate phosphorus, while the latter are good extractors of Fe and Mn from calcareous ...
by Karl K
Fri Jul 19, 2019 6:36 pm
Forum: Rose Hybridizers Association Forum
Topic: Non Blooming Amber Cloud
Replies: 4
Views: 113

Re: Non Blooming Amber Cloud

There is always the hope that second generation offspring of 'Manipur Magic' and 'Amber Cloud' will approximate the good qualities combined with reliable rebloom. 'Susan Louise' is an almost-duplicate of 'Belle Portugaise', but grows and blooms like a tall HT. http://bulbnrose.x10.mx/Roses/Rose_Pict...
by Karl K
Fri Jul 19, 2019 2:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 1
Views: 74

Why some crosses fail

It is sometimes assumed that two plants won't cross because of genetic incompatibility. That's simple enough, so we just move on. But there are cases where the failure is due to something that can be remedied. Maybe it's pH, temperature or the absence of a key nutrient/element. I happened across a p...
by Karl K
Wed Jul 17, 2019 9:34 pm
Forum: Rose Hybridizers Association Forum
Topic: Non Blooming Amber Cloud
Replies: 4
Views: 113

Re: Non Blooming Amber Cloud

I wonder whether climate is a factor. Years ago I enjoyed 'Belle Portugaise' (another R. gigantea hybrid) in Belmont, CA, flowering intermittently from October thru April. But in San Jose, not so far away, 'BP' did not repeat in any season, so far as i could learn. http://bulbnrose.x10.mx/Roses/Rose...
by Karl K
Tue Jul 16, 2019 1:33 pm
Forum: Rose Hybridizers Association Forum
Topic: Non Blooming Amber Cloud
Replies: 4
Views: 113

Re: Non Blooming Amber Cloud

Judging from the comments on HelpMeFind, 'Amber Cloud' is not a reliable rebloomer.
https://www.helpmefind.com/gardening/l. ... 464&tab=32
by Karl K
Sun Jul 14, 2019 11:17 pm
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 21
Views: 474

Re: I think I'm killing my seeds

philip_la wrote:
Mon Jan 21, 2019 5:47 pm
Thank you, Henry!
(Did I get Kuska and Karl mixed up in my mind? My apologies to both of you if so.)
Is there a lot of info on there on beneficial microbes and seed germinations as well?
A bibliography of microbes helpful to plants.
http://bulbnrose.x10.mx/Heredity/Bacter ... iblio.html
by Karl K
Sun Jul 14, 2019 11:15 pm
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 21
Views: 474

Re: I think I'm killing my seeds

philip_la wrote:
Mon Jan 21, 2019 12:28 pm
I shared my thoughts last year, and someone (was it Karl?) cited studies / info on the use thereof for other plant seeds, which contributed to my enthusiasm.
A charcoal bibliography for anyone interested.
http://bulbnrose.x10.mx/Heredity/Charco ... iblio.html
by Karl K
Sun Jul 14, 2019 12:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Rootstocks and Flower Color
Replies: 24
Views: 1711

Re: Rootstocks and Flower Color

I'm finding similar results with several Teas here in the coolth of the Central Coast, Karl. I wonder how they would be in the higher inland heat? I had wondered about the accuracy of using Rosarium Uetersen for breeding as in the inland valley heat there were no sexual parts, only petals and petal...
by Karl K
Mon Jul 08, 2019 12:00 am
Forum: Rose Hybridizers Association Forum
Topic: Easy diploid seed parents
Replies: 15
Views: 360

Re: Easy diploid seed parents

Long ago I used 'Blush Noisette'. It did not set OP seeds in my garden, probably because the reproductive parts are hidden by petals. But it was fertile when I pollinated by hand. I also used 'Perle d'Or' a little, and 'Sweet Chariot'. The latter has tiny hips and very tiny seeds. A couple of years ...
by Karl K
Fri Jun 28, 2019 1:14 am
Forum: Rose Hybridizers Association Forum
Topic: Pier or Pierre Bugnet
Replies: 2
Views: 209

Pier or Pierre Bugnet

A picture of 'Pier Bugnet'
Oh, just a duplicate of the other link.
by Karl K
Thu Jun 20, 2019 1:45 am
Forum: Rose Hybridizers Association Forum
Topic: Rosa kweichowensis
Replies: 3
Views: 220

Re: Rosa kweichowensis

The plants in the photos do look more like Rubus than Rosa. The overexposed flowers aren't clear enough, but also suggest Rubus.

Rubus rosifolius is not exactly right, but close ... and introduced in China.
Image
by Karl K
Wed Jun 19, 2019 12:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Rosa kweichowensis
Replies: 3
Views: 220

Rosa kweichowensis

I have become aware of this rare species only recently. It is an odd looking thing that is reportedly a member of the small Microphyllae section, along with R. roxburghii and R. praelucens . It is a climber, but the styles (free, not exserted) do not suggest a connection with the Synstylae species. ...
by Karl K
Mon Jun 17, 2019 11:45 pm
Forum: Rose Hybridizers Association Forum
Topic: Nectar in Roses?
Replies: 3
Views: 152

Re: Nectar in Roses?

Where is this "nectariferous ring contracting its opening" supposed to be, Karl? Nice picture of R. minutifolia. The disk is the ring around the orifice (where the styles poke through). In Spiraea the hypanthium supports a nectar-producing "disk" which is ring-shaped and may have lobes as it does h...
by Karl K
Mon Jun 17, 2019 11:22 am
Forum: Rose Hybridizers Association Forum
Topic: Nectar in Roses?
Replies: 3
Views: 152

Nectar in Roses?

I have long believed that roses never produce nectar. That's what I've read many times. Insects that visit roses are there to collect pollen. This fact seems to explain why the "female" flowers of Rosa setigera produce some pollen. Without pollen, these flowers might be ignored. Heslop Harrison (192...
by Karl K
Fri Jun 07, 2019 12:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Breeding for hardiness
Replies: 0
Views: 200

Breeding for hardiness

Hardiness is not a simple matter. Much of what passes for "winterkill" really results from plants that are still growing when the first frosts of winter hit, or when some cultivars are too anxious to start growing rapidly at the first sign of spring. The same sort of problems are encountered by grap...
by Karl K
Tue Jun 04, 2019 1:47 pm
Forum: Rose Hybridizers Association Forum
Topic: Four petals
Replies: 5
Views: 244

Re: Four petals

I enjoy these oddities and have a collection. Here are just three: an azalea, a hibiscus, and an iris. http://bulbnrose.x10.mx/Heredity/FreakyFlowers/azalea4.jpg http://bulbnrose.x10.mx/Heredity/FreakyFlowers/Hibiscus4.jpg http://bulbnrose.x10.mx/Heredity/FreakyFlowers/Iris4.jpg I do have a pic of '...
by Karl K
Fri May 31, 2019 5:14 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 25
Views: 902

Re: R. davidii

Here is a comment about R. carolina that might be useful. Bull. Torr. Bot. Club 14(12): 253-256 (Dec 1887) Remarks on the Group Carolinae of the Genus Rosa By G. N. Best, M.D. The mature fruit has not received the attention it deserves; likewise the seed. I am satisfied that from them both important...
by Karl K
Thu May 30, 2019 2:17 pm
Forum: Rose Hybridizers Association Forum
Topic: what a species is, or isn't
Replies: 25
Views: 3768

Re: what a species is, or isn't

Whenever I'm searching for one thing, I encounter something else that is at least as interesting. Here's one that has a bearing on the nature of the Species: What is a genus? Turns out there is no pat answer. More interestingly, I think, there are mechanisms that are at work in separating subgenera ...