Concord, AVSA Reg. #7807 (Horikoshi/Ozaki), Is one of my favorite chimera African violets. I am apparently not alone with that assessment. Perhaps it is the deep purple stripe on the bloom that is contracted to the pure white stripe. As far as propagation it is also a bit more challenging, often times just refusing to grow in tissue culture or just sitting there for an extra 4 weeks before any signs of growth or life than finally producing a small plantlet. I usually grow them with maybe a 1/2 dozen in culture and another 4-5 in some stage of growth in pots. As they bloom true I either place them on eBay or am contacted by one of the readers and friends of this blog and sell the plant to them. So it leaves little time to compare blooms. It was several months ago I sold a Concord on eBay and thought to myself as I was posting the picture, that the image appeared lighter than the other blooms. As you know chimera blooms or for that matter African violet bloom can vary a bit in color based on lighting and water conditions. Recently I had a couple of Concords blooming in concert. As far as I am concerned the temperature, watering conditions and lighting was near identical between these two plants yet the shade of purple was different. See the plants in bloom below. The images were taken under the same lighting and at the same time to eliminate any variance in the photography so the true color difference could be noticed. Click on the images to enlarge.
I also removed a petal from each bloom. They were equivalent in size as well as the white margins were of the same size. Below is a photograph of the petals overlaid on each other. One was with the light petal on dark and the other was dark petal on light. Can you differentiate between the two? Click on images to enlarge.
There are a couple of questions now. Is this variation the result of an environmental factor or a real mutation? There is no way to tell other than allowing another blooming cycle and tissue culture the stems of both plants and see if the two different shades remain constant in the next generation. This will take 8-9 months but will be an interesting experiment. I will keep you posted.