Search found 1224 matches

by Karl K
Sun Aug 04, 2019 7:48 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 25
Views: 741

Re: I'm new here, so I'd like to say hi!

Ah, yes! I couldn't tell if you were talking about the 4 Chinas or Chinese species roses that some of the other posters referred to. First off, there were more than four. And I think it is unreasonable to assume that these four, and the several others, are all of the same one or two species. The ar...
by Karl K
Sat Aug 03, 2019 11:44 pm
Forum: Rose Hybridizers Association Forum
Topic: Show and Tell?
Replies: 24
Views: 938

Re: Show and Tell?

Ploidy can be a bit of a challenge when you're just starting out. It's bad enough when two diploids give sterile (mostly) hybrids because their chromosomes just don't line up properly. 'Max Graf', from R. wichuraiana and a Rugosa gives very little pollen. And the plants I've seen raised from it (asi...
by Karl K
Fri Aug 02, 2019 7:44 pm
Forum: Rose Hybridizers Association Forum
Topic: I'm new here, so I'd like to say hi!
Replies: 25
Views: 741

Re: I'm new here, so I'd like to say hi!

Josh, If you happen across any of the surviving "traditional" Chinese roses, give them a close look because they might be useful for breeding. Never mind that some of the old ones are a bit delicate, in part due to inbreeding. Crossed with stronger garden varieties, they may have hidden treasures le...
by Karl K
Thu Aug 01, 2019 9:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 11
Views: 539

Re: Why some crosses fail

I finally remembered the items I wanted to mention, but forgot. They deal with roses. Bull. Torr. Bot. Club 14(12): 253-256 (Dec 1887) Remarks on the Group Carolinae of the Genus Rosa G. N. Best, M.D. There is no plant perhaps that reflects more its environments than the Rose. Growing at the foot of...
by Karl K
Wed Jul 31, 2019 5:00 pm
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 11
Views: 539

Re: Why some crosses fail

Collins (1905) The [Avocado] tree flourishes in many localities where it fails to bear fruit, and, as with the mango, this sterility is usually found in localities of almost continuous humidity.  Under such conditions an artificial check, such as root pruning, has been found to induce flowering and ...
by Karl K
Wed Jul 31, 2019 4:29 pm
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 11
Views: 539

Re: Why some crosses fail

Hi Karl, We know and understand the effect of temperature,and soil on the growth and reproductive life of plants. What role does altitude and latitude play in their flourishing? chuckp Let's not forget photoperiod, and the interaction between temperature and photoperiod. Then there is the alternati...
by Karl K
Tue Jul 30, 2019 11:34 pm
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 11
Views: 539

Re: Why some crosses fail

The whole diploid pimp section falls into the consistently fails group for me. None of what I have wants to produce hips but they all do based on pictures on HMF. Being in Australia where lack of heat isn't much of an issue it's interesting. Heslop-Harrison (1921): I therefore got up earlier, at 4 ...
by Karl K
Mon Jul 29, 2019 9:04 pm
Forum: Rose Hybridizers Association Forum
Topic: Show and Tell?
Replies: 24
Views: 938

Re: Show and Tell?

I've been obsessed with rugosas since I was a kid because my aunt used to have a "Hansa" bush (which she had gotten from her mother - so it goes way back to the 1950s). When i was little, some of my favorite memories were going to visit my aunt and having rose petals jam. When she passed away, i wa...
by Karl K
Thu Jul 25, 2019 12:30 am
Forum: Rose Hybridizers Association Forum
Topic: Roots - the neglected part of breeding roses
Replies: 40
Views: 4567

Re: Roots - the neglected part of breeding roses

Here are two more root qualities that should be considered. 1) Root systems may have a primary taproot, multiple major roots, or rather shallow fibrous roots. For example, regarding Rosa setigera, Shepherd (1954) wrote, "Fibrous root systems and wide adaptability to soil and climate have encouraged ...
by Karl K
Mon Jul 22, 2019 7:07 pm
Forum: Rose Hybridizers Association Forum
Topic: Roots - the neglected part of breeding roses
Replies: 40
Views: 4567

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: 11
Views: 539

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: 40
Views: 4567

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: 164

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: 11
Views: 539

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: 164

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: 164

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: 596

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: 596

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: 1751

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: 483

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 ...