So, I went back out in the broiling heat, and discovered another Splash Pinot Grigio - 9" diameter on its 30" tall plant:
I decided to actually measure Carafe Bordeaux - it was larger than I thought, likely due to 3 good rains in the last week: 8" flower on 24" plant! I had the 1:3 ratio right, at least.
The rain yesterday laid this Airbrush Effect down and I nearly missed it:
