Hi 2Kids1Bike,
"I am being told I may not have long stems for cut flowers if I cross with Wedding White."
So don't cross your zinnias with White Wedding. I have never bred zinnias specifically for long stems. The World Record for tall zinnias is currently
https://www.guinnessworldrecor... over 12 feet tall, and those could have some long stems!!!
I have made some selections from some tall growing zinnias like Benary's Giants and Giants of California. Both of those strains are described as 4 feet tall and have stems long enough for bouquets. And they are available in a complete color range, including White. But I confess, I have not been breeding zinnias for bouquets. I have been breeding predominately for novel-looking blooms. I think a strain of zinnias that looked like Flowering Onions would be neat.
It's hard to believe that a zinnia bloom can be spherical like an onion bloom. Maybe a bit harder to believe on that first one. I think it would be great to have a whole garden full of spheres in a full range of zinnia colors. However, 12-foot zinnias would fare rather badly in our Kansas winds.
ZM