What are the rules or indicators for what colour a new rose will be from the colours of its parents? Is it as simple as red plus yellow gives orange? What about purple plus yellow? How best to avoid a washed-out almost white with barely-there bits of colour?
Does it get more complicated with having to cross back a rose with the parent that had the desired deep colour?
Sometimes it seems it would be simple, such as when you cross a mauve HT with a golden yellow HT and create the “copper and parchment” Julia’s Rose. But, not usually. Sometimes a rose will seem to dominate its offspring with its coloring while most of the time, the default color is “pink”. There are color charts, which used to be easier to find. Unfortunately, they are falling off the Net. Hopefully, others can help find them for you.
Thanks for that chart.
It is one big DNA lotery. I have results you may think they are miss labeled but some do not even look like its mom and dad.
Anectdotally, I have to say the chance of a pink rose is dramatically understated for some of those combinations. 
If I remember correctly, the original creator went through “modern roses X” (or whatever, some sort of book registry with stated parentages) and tallied things out…so in some ways it’s likely pretty heavily skewed towards older HT’s and Floribunda and obviously just the “successful” results of a cross (and not their 1000’s of rejected siblings).
Oh. Put in that context, it makes much more sense.
