Search found 382 matches

by Larry Davis
Fri Sep 20, 2019 10:38 pm
Forum: Rose Hybridizers Association Forum
Topic: Newbie question
Replies: 6
Views: 144

Re: Newbie question

About hip picking in autumn. A couple years ago (fall 2017) I had access to a bunch of OP hips on two plants of a yellow HT/grandiflora of uncertain parentage but rather like Julia child. I knew that they had set at midsummer or later but a hard frost was coming. So I cut them off long with leaves s...
by Larry Davis
Sun Aug 25, 2019 3:58 pm
Forum: Rose Hybridizers Association Forum
Topic: Non-fading suggestions
Replies: 11
Views: 433

Re: Non-fading suggestions

First Impression, by Jim Sproul has given me very saturated yellows that last. Not very winter hardy at 0 F or below and will get blackspot if there is any in town. But I've crossed it to get some very good yellows that don't have BS. It resists mildew and can improve it's partner's performance. For...
by Larry Davis
Mon Aug 12, 2019 11:05 pm
Forum: Rose Hybridizers Association Forum
Topic: Lac Majeau x John Cabot
Replies: 2
Views: 129

Re: Lac Majeau x John Cabot

That looks a potentially very interesting rose. Love to see a later bloom which may be even more double and larger.
by Larry Davis
Mon Jul 29, 2019 10:17 pm
Forum: Rose Hybridizers Association Forum
Topic: Why some crosses fail
Replies: 11
Views: 532

Re: Why some crosses fail

I can't say a lot about why crosses fail other than plant incompatibility but about Therese Bugnet there is something odd going on in my experience. AT my house it competes with roots a a neighbor's maple tree and gets enough supplementary water to keep it growing. But it neve gets above 5 ft tall, ...
by Larry Davis
Thu Jun 06, 2019 12:02 am
Forum: Rose Hybridizers Association Forum
Topic: ruby slippers dancing
Replies: 3
Views: 227

ruby slippers dancing

ImageFinally got a decent photo of this one
by Larry Davis
Wed Jun 05, 2019 10:29 pm
Forum: Rose Hybridizers Association Forum
Topic: Seedling
Replies: 33
Views: 1829

Re: Seedling

That Art Nouveau results is great. Shows it is heritable, not just a defect in Art N. itself.
by Larry Davis
Fri May 31, 2019 11:56 pm
Forum: Rose Hybridizers Association Forum
Topic: R. bracteata x Carefree Copper
Replies: 15
Views: 1081

Re: R. bracteata x Carefree Copper

If you want a more direct source of persian yellow, Carefree copper is of course roughly half Austrian Copper. The other half comes out of Griffith Buck's breeding program which sprinkled in R laxa and other less common materials. I assume that the yellow in his was derived from one of the Persian y...
by Larry Davis
Wed May 29, 2019 8:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Seedling
Replies: 33
Views: 1829

Re: Seedling

Really looks good. Winter hardy? BS resistant?
by Larry Davis
Wed May 29, 2019 8:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Seeking R. foetida group pollen
Replies: 1
Views: 116

Re: Seeking R. foetida group pollen

Andre, just sent you a PM.
by Larry Davis
Tue May 28, 2019 8:26 pm
Forum: Rose Hybridizers Association Forum
Topic: Helpful tip plant markers
Replies: 5
Views: 451

Re: Helpful tip plant markers

I found that on ordinary plant labels made of plastic, pencil will erase with mud. Peat moss and artificial potting mixes do not work but a silt clay loam with a little water is really effective. then rinse and write again. Usually brittleness of the plastic is the biggest problem. A little very fin...
by Larry Davis
Fri May 17, 2019 7:21 pm
Forum: Rose Hybridizers Association Forum
Topic: Juvenile bloom in cold Hardy varieties
Replies: 3
Views: 176

Re: Juvenile bloom in cold Hardy varieties

The only rugosa I have ever attempted to cross is Th B. The only pollen donor is R pomifera. But I think that all the offspring are actually ThB only. I feel like the Rp is inducing some kind of apomictic seed production because I never had hips form on ThB before using the R pom. (maybe 1 in 5 yr)....
by Larry Davis
Thu May 16, 2019 10:06 am
Forum: Rose Hybridizers Association Forum
Topic: Stratification period?
Replies: 6
Views: 212

Re: Stratification period?

Philip, I do sort of like you, but with the calcium nitrate added to vermiculite. I check regularly every month for a year while holding the seeds at 4C (40F) in a standard refrigerator from the 1950s. I have also done deliberate cycling like von Abrams and Hand did back in the 1950s. They did 4 cyc...
by Larry Davis
Tue May 14, 2019 6:38 pm
Forum: Rose Hybridizers Association Forum
Topic: Rose Rosette Disease SCRI Review Meeting Slide Presentations
Replies: 3
Views: 211

Re: Rose Rosette Disease SCRI Review Meeting Slide Presentations

The most scary thing to me is that we may get something resistant but a carrier like Typhoid Marigold. I want to see if R woodsii can catch detectable RRD. I have a ton of seedlings. But what if it is a carrier?
by Larry Davis
Sun May 12, 2019 9:35 am
Forum: Rose Hybridizers Association Forum
Topic: Carefree Copper pollen
Replies: 0
Views: 285

Carefree Copper pollen

CC is in full bloom. If you'd like pollen, post a message to ldavis who uses email at ksu which is an edu cational institution. Include your contact information in that message so I can send you some via 1st class mail.
by Larry Davis
Wed Apr 24, 2019 9:56 pm
Forum: Rose Hybridizers Association Forum
Topic: First blooms vs mature blooms on seedlings
Replies: 4
Views: 215

Re: First blooms vs mature blooms on seedlings

That surely deserves a WOW. How is is as a bush? looks like it has avoided the hulthemia spines near the flowers at least. The color shadings are superfine.
by Larry Davis
Fri Apr 19, 2019 9:29 am
Forum: Rose Hybridizers Association Forum
Topic: tissue culture
Replies: 7
Views: 255

Re: tissue culture

So far as I'm aware there has been relatively little interest in propagation by tissue culture, at least acknowledged as such, for several decades. I looked into it with a couple undergraduates when there was someone at U of Wisconsin hort dept doing it. And one of the large companies J & P I think,...
by Larry Davis
Fri Apr 12, 2019 10:06 pm
Forum: Rose Hybridizers Association Forum
Topic: first roses of the year
Replies: 19
Views: 539

Re: first roses of the year

I searched as best I could and the closest analogy that might work is photochromism. Some folks have referred to the difference in rose petal color with light intensity (particularly toward the UV end of spectrum) as photoblastic. But that term is reserved for seeds where germination responds direct...
by Larry Davis
Wed Apr 03, 2019 10:02 pm
Forum: Rose Hybridizers Association Forum
Topic: more pics for i.d.
Replies: 5
Views: 236

Re: more pics for i.d.

That lone hip sure looks like a canina after winter. My bushes, seedlings all, vary in thorniness, but generally more than you seem to show. But the reddish stems and buds swelling now is characteristic. Could these have been rootstock? My material came from a huge old bush in PA which was ID'd deca...
by Larry Davis
Sat Mar 30, 2019 10:46 pm
Forum: Rose Hybridizers Association Forum
Topic: Varying Germination with Differing Pollen Parents
Replies: 13
Views: 290

Re: Varying Germination with Differing Pollen Parents

How many seeds did you get per hip? That will tell you something of the compatibility of the two parents. More is better obviously but but the potential # is set by DE. A low # indicates a poor match which might yield a seed that is inviable after partial development. So the hips may contain only em...
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: 340

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...