I’d wait until next year. It’s not the length of time that’s so important, although that is a factor … the most important thing is to get good sturdy plants established in the growing season (May - September) before the plants slow down during the shorter daylight hours and cooler temperatures in the winter.
Then in the spring, as the temperatures rise and the daylight hours lengthen, the plants put on more growth and it’s then that the lovely white broccoli shoots appear.
White sprouting broccoli really is a gourmet veg, and so rarely available in the shops. Grow it properly and enjoy it. 😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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A long time.
There is your answer.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I'm quite enjoying my misunderstanding - I thought you were saying your broccoli seeds had produced white sprouts!