Cabbage left in ground over winter, now flowering with yellow blooms and no head forming? It's bolted—game over for this plant.
Cabbage is an annual. Overwintered plants treat spring as their second season: they flower, set seed, and die. No head will form now.
Brassicas (cabbage family) build up soil pests/diseases (clubroot, cabbage worms). A 3-year rotation breaks cycles.
Start fresh with new seeds or transplants in a clean bed. That's the only way to get heads.
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