Search found 357 matches

by Larry Davis
Sun Feb 17, 2019 10:23 pm
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 30
Views: 410

Re: Hardy, Everblooming Climbers

I'm sure there is a wide range of hardiness in some species of roses, but I don't know how much in which. It is well known in in the nursery trade that CV of dogwood or redbud that are grown down south and shipped all round the U.S. via bigbox stores often are not hardy. But I sent redbud seedlings ...
by Larry Davis
Sun Feb 17, 2019 7:53 pm
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 30
Views: 410

Re: Hardy, Everblooming Climbers

In the category of sweeping generalizations consider the following. Cold-hardiness is probably for many purposes a quantitative trait. That is, it takes a considerable number of genes. So when you cross two roses of different hardiness categories, you ought to get something about halfway in between,...
by Larry Davis
Sat Feb 16, 2019 7:52 pm
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 30
Views: 410

Re: Hardy, Everblooming Climbers

That article about Risley is very interesting. However, I notice one quirk. American Pillar #84 which I bought many years ago as Golden ARctic (#84) was definitely yellow, not pink. It is parent of my Arctic Sunrise and was quite hardy here to -10 to -20. So i don't know if the naming was changed wh...
by Larry Davis
Tue Feb 05, 2019 10:54 pm
Forum: Rose Hybridizers Association Forum
Topic: 'Chinook Sunrise' parentage
Replies: 21
Views: 445

Re: 'Chinook Sunrise' parentage

I had Sir Thomas L. for years. Beautiful white double flowers on a rugosa-type but glossyish foliage. Sterile as a steer. My recollection was much like what Greenman shows on HMF, no trace of pink color, maybe a little green. No clue on actual winterhardiness up your way. Fine here but we've not had...
by Larry Davis
Wed Jan 30, 2019 10:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Dipping [cut] roses in calcium before shipping
Replies: 4
Views: 70

Re: Dipping [cut] roses in calcium before shipping

Very interesting idea. Any clue what concentration? And would it have to be pure CaCl2 or would a commercial salt replacement (icemelt product) work? Will this work be published perhaps in a hort jnl?
by Larry Davis
Sat Jan 19, 2019 9:14 pm
Forum: Rose Hybridizers Association Forum
Topic: First germination of the winter
Replies: 79
Views: 1301

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: 18
Views: 331

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: 6
Views: 157

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: 79
Views: 1301

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: 79
Views: 1301

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: 301

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: 11
Views: 252

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: 277

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: 113

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: 705

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: 14
Views: 327

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: 14
Views: 327

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: 14
Views: 327

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...