(R. glauca x R. rugosa) x ?

So, two years ago I was inspired by Henry’s link to

http://home.neo.rr.com/kuska/carmenetta.htm to cross

R. glauca x R. rugosa. The seedlings all look basically like

a R. glauca plant with more thorns. They are about to

bloom for the first time this spring. I can’t decide if I

should cross them with themselves to get more differentiated

seedlings, or immediatly cross them with some modern

tetraploids. So, I’m soliciting advice from you more

experienced hybridizers.

Why not try both? Assuming that you have enough flowers from your seedlings.

Another possibility is to use mixed pollen at first since you do not know what it will be fertile with and which seeds will germinate easily.

You can get an idea of my “philosophy” by looking at my last summers pollinations as sorted by seed parent and by pollen parent:

Http://home.neo.rr.com/kuska/hips-2003-season-sort-seed.htm

http://home.neo.rr.com/kuska/hips-2003-season-sort-pollen.htm

Possible “unusual” tetraploid plants in this list are:

(Calcocarpa X R. Nutkana)

(((Therese Bugnet X OP) X OP) X R-15)

((Delicata X OP) X ((Therese Bugnet X OP) X OP))

((Delicata X OP) X Will Alderman)

((Therese Bugnet X OP) X OP)

(((Therese Bugnet X OP) X OP) X OP)

(Corylus X OP)

(Hansa X OP)

Dortman

(Sir Thomas Lipton X OP)

(Tetraploid Acicularis X OP)

(Unknown Rugosa X OP)

(Basye’s Amphidiploid X OP)

(((Therese Bugnet X OP) X OP) X William Baffin)

Henry, does your seedlings of Basye’s Amphidiploid bloom, and then terminate without opening? I’ve noticed that all three of my seedlings that has some BA in it will make a few flowers, but they will never open and then fall off. I’m just wondering if it is just my own plants.

Enrique, I do not recall that type of behavior with Basye’s Amphidiploid.

I do have one very double Hansa seedling that almost never opens (I probably have had it for about 7 seven years).

Why not try both? Assuming that you have enough flowers from your seedlings.

Because I don’t have that much space to grow new seedlings.

Well, seeing how much the flowers look like glauca

(except for a wider rounder petal they could be glauca)

I think I’ll cross them with each other and see if I can

get anything a little more rugosa looking.

I find it interesting given the ten plants that bloomed

that they have divided their flower shapes exactly 50/50.

(see photo below)

The more rugosa-like flowering plants have slightly

less glaucous foliage.