Search found 352 matches

by Larry Davis
Sat Jan 19, 2019 9:14 pm
Forum: Rose Hybridizers Association Forum
Topic: First germination of the winter
Replies: 38
Views: 651

Re: First germination of the winter

Looks like an improved Masquerade or Circus. That seems to have real potential.
by Larry Davis
Sat Jan 19, 2019 9:10 pm
Forum: Rose Hybridizers Association Forum
Topic: I think I'm killing my seeds
Replies: 8
Views: 102

Re: I think I'm killing my seeds

I've never used charcoal. Was this pure stuff purchased as such, or left over from a fireplace? Charcoal from trees burned, is full of potash as the hydroxide, like oven cleaner. Pure activated charcoal is supposed to be neutral. Crushed charcoal briquets have a lot of binding agents in them. I neve...
by Larry Davis
Fri Jan 18, 2019 10:52 pm
Forum: Rose Hybridizers Association Forum
Topic: Anybody using any of the old HT fav's of the 20th c.?
Replies: 3
Views: 77

Re: Anybody using any of the old HT fav's of the 20th c.?

I still have Crimson Glory, Iceberg, Mr. Lincoln, Carrousel, Impatient, Frau Karl Druschki hanging on with no spray last couple years, minimal prior couple years. They've been here 40 yr or so and I'm not feeling like digging them out. But they're not worth collecting pollen, IMO. I've used them one...
by Larry Davis
Wed Jan 16, 2019 9:55 pm
Forum: Rose Hybridizers Association Forum
Topic: First germination of the winter
Replies: 38
Views: 651

Re: First germination of the winter

The NDxymin that I mentioned above might be considered a climber but probably not. The original plant, totally neglected for a couple decades, gets about a ft long, sort of along the ground in very poor dry place with too much shade. The 5 or 6 that I grow in pots reach around a yard high because I ...
by Larry Davis
Fri Jan 11, 2019 10:34 pm
Forum: Rose Hybridizers Association Forum
Topic: First germination of the winter
Replies: 38
Views: 651

Re: First germination of the winter

Usually I don't discuss germinations because so often I find nothing worth talking about at bloom time, or disease testing time in the next summer. But today I planted out 4 dozen seedlings that had sprouted in their stratification mix (vemiculite-calcium nitrate) after about 4-5 mo in the frig. The...
by Larry Davis
Wed Jan 09, 2019 9:52 pm
Forum: Rose Hybridizers Association Forum
Topic: Do more richly colored seedlings have more richly colored blooms?
Replies: 10
Views: 282

Re: Do more richly colored seedlings have more richly colored blooms?

Unfortunately I don't know of any good simple explanations for flower color in a complex mix of polyploids such as most roses. I think you have to make tables of empirical observations and go from there. For sure it is not simple Mendelian inheritance, although that would allow for some examples cit...
by Larry Davis
Sat Jan 05, 2019 11:45 pm
Forum: Rose Hybridizers Association Forum
Topic: Is it just me? (On rose rustling...)
Replies: 10
Views: 200

Re: Is it just me? (On rose rustling...)

Karl, Could that rambler type be something sold as climbing American Beauty? Jim Urban (Microbiology) had a huge bush on the back of his house and garage on 17th St just south of Alice Stockwell's place (She was a realtor for maybe 50 years.). I got cuttings from him and it has survived in semi-wood...
by Larry Davis
Sat Jan 05, 2019 10:57 pm
Forum: Rose Hybridizers Association Forum
Topic: Winter resistance and frost resistance of cultivars of groundcover roses introduced to M.M. Gryshko National Botanical G
Replies: 1
Views: 61

Re: Winter resistance and frost resistance of cultivars of groundcover roses introduced to M.M. Gryshko National Botanic

Thank you Henry. Looks like interesting work. Ukraine has a very wide range of temps. I'm not sure where the national botanical garden in located. Kiev? It does get rather cold there, or at least it used to.The CV names are in English too in a table listing how they did over winter. Also a table ind...
by Larry Davis
Sat Dec 29, 2018 10:09 am
Forum: Rose Hybridizers Association Forum
Topic: David Austin
Replies: 5
Views: 259

David Austin

I just saw the obituary for David Austin in the New York Times. He was 92, died Dec 28. His company survives, with one son also named David as manager. He had other children and grandchildren. His wife, a sculptor, died in 2007. He opened up the range of roses that people find acceptable by producin...
by Larry Davis
Thu Dec 27, 2018 7:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Video tour of FIVI3 seedlings
Replies: 7
Views: 109

Re: Video tour of FIVI3 seedlings

Impressive contrasts. What was the coldest night last winter? If those all grew back from roots, they have really impressive vigor.
by Larry Davis
Tue Dec 25, 2018 6:26 pm
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 687

Re: Rebloom

Points well taken. Longevity is also very temperature dependent among roses that last more than 1 day, in my experience. This is a characteristic that the knockout roses have, perhaps in excess. In our climate Rainbow KO will hold petals until they turn green and brown making some preddy ragged look...
by Larry Davis
Sat Dec 22, 2018 9:11 pm
Forum: Rose Hybridizers Association Forum
Topic: Flower bud differentation and growing in rosehip.
Replies: 13
Views: 301

Re: Flower bud differentation and growing in rosehip.

Karl, my error in speed reading. The authors used R wich and F & P which they simply call R hybrida with no comment on whence it may derive. I presume they used R wich as a readily available OF rose and F & P as a OF parental type for Little White Pet. I conflated the two observations but have no cl...
by Larry Davis
Wed Dec 19, 2018 9:15 pm
Forum: Rose Hybridizers Association Forum
Topic: Flower bud differentation and growing in rosehip.
Replies: 13
Views: 301

Re: Flower bud differentation and growing in rosehip.

Thank you David. There is a nice 2012 article that cites Roberts et al, and it's a free PMC article. I found it from it citing the abstract you linked. I think I read it previously but totally forgot. They compared CF sport Little White Pet with its R wichurana hybrid parent that is OF. Varied doses...
by Larry Davis
Tue Dec 18, 2018 11:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Flower bud differentation and growing in rosehip.
Replies: 13
Views: 301

Re: Flower bud differentation and growing in rosehip.

I tried searching for flower induction in rosaceae. Lots on strawberry, some on blackberry and raspberry, little on once-flowering roses. Someone living in coastal Cal could give us the answer. Does foetida bloom in S.D., San Jose, S.F.? S.F. sure isn't hot in summer or cold in winter but it might g...
by Larry Davis
Tue Dec 18, 2018 11:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Three-year screening for cold hardiness of garden roses
Replies: 5
Views: 209

Re: Three-year screening for cold hardiness of garden roses

My point was just that you could cool things at a rate emulating what happens outside. I know that there are times when it falls 50 F in 2 hr but mostly it is a cold clear night where the temp drops about 30 F from where it starts, then the next day rises partway up and drops a step further. so I wa...
by Larry Davis
Mon Dec 17, 2018 10:28 pm
Forum: Rose Hybridizers Association Forum
Topic: Flower bud differentation and growing in rosehip.
Replies: 13
Views: 301

Re: Flower bud differentation and growing in rosehip.

If I'm not mistaken there have been studies on the timing of when flower buds are formed in a number of rosaceae, and in fact for some it is in winter, not in summer. That's why you have to have a winter chill to get flowers on some fruits. Strawberries do it in late summer/fall except ever-bearing ...
by Larry Davis
Mon Dec 17, 2018 9:18 pm
Forum: Rose Hybridizers Association Forum
Topic: Three-year screening for cold hardiness of garden roses
Replies: 5
Views: 209

Re: Three-year screening for cold hardiness of garden roses

The actual hardiness testing described in the paper is rather elaborate and I think Donald has the right idea. But somehow you have to control the rate of freezing after storing the stems in a refrigerator for a couple weeks. I fairly confident that refrigerator acclimation is abslutely essential, a...
by Larry Davis
Mon Dec 17, 2018 8:52 pm
Forum: Rose Hybridizers Association Forum
Topic: Three-year screening for cold hardiness of garden roses
Replies: 5
Views: 209

Re: Three-year screening for cold hardiness of garden roses

Thank you Henry. I could not access the first article in Sci Hort from home. But I was referred to a similar article by Science Direct, and it is available without paying access fees. It focuses on 4 roses representing 4 hardiness zones, out of the 16 screened. Journal of Plant Physiology Volume 232...
by Larry Davis
Fri Dec 07, 2018 6:44 pm
Forum: Rose Hybridizers Association Forum
Topic: HUMAN AND ANIMAL HEALTH Some Hematological and Non-Specific Immune Responses of Rosehip (Rosa canina) - Fed Russian Stu
Replies: 3
Views: 154

Re: HUMAN AND ANIMAL HEALTH Some Hematological and Non-Specific Immune Responses of Rosehip (Rosa canina) - Fed Russian

Nyblom and associates in Scandanavia did a lot with trying to commercialize various caninae. There are also papers from Turkey, mainly in Acta Horticulturae I think. (That's a series of books publishing papers from various European meetings.)
by Larry Davis
Fri Dec 07, 2018 6:40 pm
Forum: Rose Hybridizers Association Forum
Topic: Rebloom
Replies: 23
Views: 687

Re: Rebloom

Occasional rebloom may well be buds that remained dormant in the first flush. Up the street there is an enormous, unpruned Dr. Huey which has occasional rebloom in mid to late summer in some years. I investigated and it appears to be later shoots are coming from further down the main canes that the ...