Talked with a lady, who have been breeding her own seeds for 20+ years. She has followed her own head, and done interesting things. For practical reasons she let white and red cabbage cross, in that way she has made her own white/pink/red cabbage grex. But to keep it a good grex, she has developed a practice of selection, to keep the colours in balance. There will develop a lot of pink cabbage, but if parents are selected for deep red or pure green, she gets more white and red, and less pink. She can do the selection before transplant, and still have a lot of material to select also for health and size. She do the same thing with yellow and red onions. I think a balanced grex allways goes with a balanced selection. Making a new grex include finding the right selection criterions.

I hesitate to include tomatoes into the grex family. Tomatoes (like lettuce and bean) are strong inbreeders. You will start with a cross, but end with one or more varieties in a mix. The varieties will repeat themselfes in each generation. I would rather call it a landrace, or should we make a new word “gardenrace”. In a grex I would expect genetic recombination in each generation.