If helmet heads are caused 95% by environment and 5% by how particular genetics interacts with the environment, then I feel like I am making progress by eliminating the 5%.
I collect tens of thousands of tomato seeds per year. It doesn't matter to me if any particular seed lives or dies. I'm not worried about wasting a seed. I usually start tomatoes in a large pot densely planted. I cull about half of the quick-germinating seeds while potting-up. The slow germinating seeds all get culled. Then they also get culled because of frost, or bugs, or blossom end rot, or failure to thrive.
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