This is sort of an aide memoire for Our Diane, as she's the main asparagus cook in the house.
I'll be growing asparagus in great troughs hung from the back fence. Might be there's fifty shoots in a trough.
Year 1: You identify which ten are the biggest, greenest, healthiest-looking shoots and you leave those alone. Don't pick those because they're your breeding group. You let them grow, flower, and seed. Pick the remaining forty shoots for food and be sure to compost your cuttings.
Year 2: The ten from last year have bred and new shoots have emerged. Because they've been bred from the best of last year's asparagus, this lot are collectively better than last year's crop. The genes for a good quality crop have been passed down. Once again you have fifty shoots. Pick your ten healthiest and keep them for your breeding group. Make sure this year's breeding group is not comprised exclusively of last year's breeding group or else evolution stops. Eat the rest. Compost your cuttings.
Year 3 onward: As per year 2.