How to care for a flowering cabbage after it has grown 4ft. tall

I just need to Know whats next after the cabbage grows and then the root comes out the ground and the whole cabbage is just to heavy in weight and falls over.

Instructions

Difficulty: Moderately Challenging

1. I planted the cabbage in the winter.
2. The cabbage grew normally, I didn't water it I let mother nature water it during the winter.
3. Then it started growing.

Tips & Warnings

• Then it seemed like overnight it just grew and grew and wouldn't stop growing.
• I don't forsee any thing hazardous happening.