Search found 383 matches

by Larry Davis
Mon Mar 11, 2019 11:57 pm
Forum: Rose Hybridizers Association Forum
Topic: Still trying to wrap my head around Canninae meiosis, and how to overcome...
Replies: 12
Views: 347

Re: Still trying to wrap my head around Canninae meiosis, and how to overcome...

About that caninae meiosis as observed with R. pomifera. Some years back I got a seedling for that triploid R pom from David Z. Looks like about 10 yr ago as I had a plant big enough to pollinate in 2010. Crosses have worked apparently both ways but I'm always suspicious of R pom as female parent wh...
by Larry Davis
Wed Mar 06, 2019 9:04 pm
Forum: Rose Hybridizers Association Forum
Topic: First germination of the winter
Replies: 120
Views: 3235

Re: First germination of the winter

Update on my earlier post (pg 2 of this series). Those first germinations have yielded some flowers. One of interest is a yellow, looking very like #1100 in coloring and petalage. The mother is New Dawn x yellow mini which has a different flower shape and a more pink coloration. Another rather doubl...
by Larry Davis
Wed Mar 06, 2019 8:51 pm
Forum: Rose Hybridizers Association Forum
Topic: cherry frost & lemon drift
Replies: 10
Views: 257

cherry frost & lemon drift

On the same page with Pretty Polly series, which look like great roses, there is a bright red by Julie Overom. Has anyone up north (WI, MN etc) seen Cherry Frost in action during its limited distribution last year? Or during earlier testing phase? Seems like it is a much bigger bush than the Polly s...
by Larry Davis
Sun Mar 03, 2019 8:21 pm
Forum: Rose Hybridizers Association Forum
Topic: STUDIES OF THE EFFECT OF SOIL NITROGEN ON THE DEVELOPMENT OF BOTTOM BREAKS AND ON THE NITROGEN FRACTIONS OF THE LEAVES,
Replies: 1
Views: 81

Re: STUDIES OF THE EFFECT OF SOIL NITROGEN ON THE DEVELOPMENT OF BOTTOM BREAKS AND ON THE NITROGEN FRACTIONS OF THE LEAV

Very interesting study, but I think there's a flaw in the recipe for Nessler's reagent. Iodine and KI are not that soluble in water as specified. In addition, it contains so much mercury that on one would dare try to use it today. With modern flow injection analysis there would be no need anyway. Be...
by Larry Davis
Fri Mar 01, 2019 8:01 pm
Forum: Rose Hybridizers Association Forum
Topic: The volume of Acta Horticulturae with rose articles from the meetings in Angers France is out!!
Replies: 3
Views: 174

Re: The volume of Acta Horticulturae with rose articles from the meetings in Angers France is out!!

I regret that since the fire we have had to cancel about $1 million worth of subscriptions, with a freeze on new acquisitions for this year. SO no luck. WE have the other six symposia (maybe) but they are not retrievable until the library reopens next year.
by Larry Davis
Wed Feb 20, 2019 10:55 pm
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 55
Views: 1505

Re: Hardy, Everblooming Climbers

I wish I had more than anecdotes on flower timing. But as an example, I have a once-flowering hybrid of something I called Pink Single which was Carefree Beauty x Rise N Shine. Using pollen of an interesting seedling from David Zlesak (nominally triploid R. pomifera) I got a dwarf plant looking for ...
by Larry Davis
Sun Feb 17, 2019 10:23 pm
Forum: Rose Hybridizers Association Forum
Topic: Hardy, Everblooming Climbers
Replies: 55
Views: 1505

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: 55
Views: 1505

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: 55
Views: 1505

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: 22
Views: 715

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: 86

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: 120
Views: 3235

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: 21
Views: 601

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: 197

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: 120
Views: 3235

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: 120
Views: 3235

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: 16
Views: 771

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: 280

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: 76

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: 308

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...