Shah, in my climate here is what I found out:
Changes in productivity of Col de Dame variants? Well I only have one, CDDG and my tree has not grown that much this year. Maybe 6inches of growth. The tree is loaded right now but more figs than last year. The figs won't ripen if we don't have a long summer. Fall is trying to creep in, cool nights, hot and sunny days. Time will tell.
As for VdB, I have 7 or 8 trees in large containers and one in my orchard. They puts out a lot of figs but it also sucks water. My Petite Negra has out grown both my VdB and Negronne. I have one of each of these in the ground. Negronne out performed them both, VdB came in second and PN just reached 8' this year and only 4 figs. And I only fertilized my trees once this year. We're suppose to have a hard winter this year and I was worried about my orchard trees. So I only fertilzed them once.
My most productive trees are:
Atreano
Hardy Chicago
Kadota
LSU Hollier
Marva Sika
Stella
Improved Celeste
Tacoma Violet
Marseilles Black VS
Lyndhurst White
Negronne
Paradiso
LSU Black
Peter's Honey
Improved Brown Turkey
Salem White
LSU Gold
Salem Dark
Pananas Purple
Soni, Willow Stree is definately a keeper. The figs are huge and very sweet even if not fully ripe when picked. But the figs do split when it rains. Putting mine i a self watering pot next year.
Violet Sepor was the best to date. It is definately a keeper!