What are the pros? Beautiful broccoli
What are the cons? Vernalization in North Climate
This is a "true" broccoli, as opposed to "Calabrese" broccoli. The former needs to overwinter in order to produce heads while the latter forms heads in the same year. In northern climates where the temperatures are too low for the Romanesco to survive, the solution is to use a vernalization, which is sort of make-belief the plant it went through a mild winter. Sow the seeds indoors under lights until true leaves appear. Harden off under cloche or in cold-frame or in a low tunnel for a week to 10 days. Then keep them in their sheltered space for 3 to 4 weeks. The temperatures in the sheltered area (not ouside, really inside the cold frame or low tunnel) should ideally be around 40?F. Carefull on sunny days, temperature can rise quite a bit under cover. The seedlings need to "think" they went through winter and spring. After that vernalization period, the Romanesco will produce their stunning heads.
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