Answer: If your broccoli has flowered, it's past its prime. Broccoli grows best in cool weather and should be planted in March in your gardening region, or in September for a winter harvest. After the main stem is harvested, your plants will develop smaller side-shoots for later harvest. When grown in warm weather, the plants will bolt (flower). If this happens, remove them from the garden and plant something else, such as carrots or tomatoes. After harvesting this second crop, you can plant broccoli again.
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