Your flowering cabbage has bolted — a natural response to winter cold or summer heat that triggers tall, yellow-flowered seed stalks. Once a biennial bolts, the show is over. The plant exhausts its energy flowering and setting seed, then declines. You can't restore its compact, colorful rosette form.
Enjoy the architectural beauty of the bloom spikes, then remove the plants. For next season, plant fresh starts in fall for winter color or in early spring for a shorter display before summer heat triggers bolting.
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