Pollen came from a common pachanoi, the kind that is widespread, fast growing, fairly hardy but containing rather low amounts of mescaline. This plant has a white flower.

The maternal plant is a grandiflorus type named for a region in Argentinia. This plants has a yellow flower.

The flowers of the parent cross: ( yellow X white ) = ?

The stems are obscured, but here are five f1 plants flowering.

Two salmon pink
Two yellow
And one (maybe two) red with cream/white centers

The sample is too small to make it useful statistically, but we can at the least infer that we have at least three flower colors, and over the years these are the only colors witnessed on these hybrids... So far...

YY WW would f1 as YW, one would expect some uniformity perhaps?
If it was however YY Ww then there would be YW and Yw, to use perhaps overly simple thinking.... But that would yield a 1:1 population ratio. So what if it is Yy Ww? Then it would be YW yW Yw yw... 1:1:1:1
But perhaps Y is a dominant yellow, and y is red and is recessive to Y. Then W is white actively and w is white passively...
So then YW is yellow as is Yw.
yW is pink or salmon (red and white mixed)
Then yw is red (with white or lighter centers) the passive white being covered by the red
Then hypothetically this could be a 2:1:1 yellow:salmon:red...

I am of the opinion that the pachanoi clone in this case is heterozygous and I believe it to be a cross between pachanoi and cuzcoensis with a dominant short spine allele covering up another allele for long central spines. As far as I know I am the only one who thinks this... So don't pay it too much attention, until I start pointing out the spine traits of the f2 offspring of this same cross...if I decide to.

Oh so beautiful sir good work. Is there any certain growing conditions that help them flower? I have they tho see any of my cacti flower unfortunately.

Healthy looking!

Plants in the grandiflorus complex flower fairly easily in cultivation as do these hybrids, but other species may be reluctant to flower without a greenhouse in an area or climate where they cannot be grown outside year round. I suspect that there is a chilling requirement that relates to flowering, among other factors... Age, size, light, water etc
These plants shown can flower at a size of about six inches, about fifteen centimeters tall. Species like Echinopsis pachanoi flower much closer to about a meter tall, with a few exceptions, sometimes something about half that size will be large enough to flower.

I believe that the way flowering is triggered is not simple, but involves many factors. The most simple but least convenient way to get them to flower in a cold climate is to build a greenhouse or keep them close to a very large and well lit window and care for them for years, allowing them to get large and be fed well. They need a decent bit of root space to thrive, though some peruviana forms thrive in very tight and small root conditions they all benefit from having lots of space for the roots and a nice, well draining, fertile soil. I do think they need some temperatures near freezing, 0 C, 32 F, at least nights around this cold, with well lit days, once they are the proper size, to help induce flowering, after this type of exposure during winter specimens that are adequately mature will grow very hairy in some areoles in spring or early summer, typically these areoles are close to the top, but not always. These hairy areoles contain developing flowers and ovaries which will typically develop and grow over the summer and fall.

If you want to enjoy the flowers of cacti it is easier to get a couple of plants that flower easily, than it is to get a reluctant to flower plant to bloom.

I wish I could obtain an original clone of the grandiflorus parent (andalgalensis) and perform a back cross using the f1 as the pollen source. It might be possible to cross the F1, using it as maternal material and again using pollen of a pachanoi or similar plant. I don't have access to any good pollen sources currently anyway. It would be awesome to have scop pollen!

^nice one AKL
i'll add that being somewhat rootbound seems to be helpful in encouraging flowering

but climate and solar hours seem more important

Yea i have a 12 inch grandiflorus but i never left it get as cold as you say, usually being it in before those temps. So maybe this growing season I'll leave the grandiflorus and my bridgesii out a lil longer for some cold and see if they flower.

Please don't put your plants at risk if they could die or freeze.

http://www.troutsnotes.c...ndalgalensis_F_index.htm
Maternal clone flowering depicted above

http://www.nopalcactusbl...ocereus-pachanoi-blooms/
Paternal clone flowering depicted above


Or perhaps some pollen from a red grandiflorus type as able to fertilize the maternal clone?

Lol I wouldnt just kill my plants, im saying just give them a lil more cold then usual before I bring them in not torture them with snow. Maybe even putting them out slightly sooner could do it also.