Ploidy of Topaz Jewel

I have always assumed that Topaz jewel is a triploid from its breeding. Helpmefind says it is a diploid. Which is correct?

Someone recently stated that it was verified to be a diploid.

see the posting linked below


Hi Johannes,

I thought it was triploid too and was really surprised to find it was diploid when I counted it. It is a cross of a triploid yellow miniature and diploid rugosa, so that is reasonable. Wide diploid crosses can have relatively low fertility like many triploids too. ‘Max Graf’ is a good case in point.