Broccoli can be categorized as heading broccoli, broccoli raab (rapini), or broccolini. The difference is in the growth habit. Heading broccoli produces large main heads similar to those found in grocery stores. It can produce side shoots of smaller heads after you've harvested the main head. Broccoli raab and broccolini produce large amounts of smaller shoots with no central head. It is best to succession plant broccoli for a continuous harvest. Broccoli prefers cool temperatures, high fertility, and even moisture. Mulch heavily around plants and protect with row cover if high temperatures are expected. Row cover can also help to reduce soil evaporation in hot, dry climates.