(40 days. Open pollinated) Brassica rapa. This is the quickest broccoli raab to mature. Sorrento has some of the largest, most uniform dark green florets in the early category, averaging 3-4 inches across. It grows upright to 30 inches. A choice pick for the early gardener and specialty market grower. Harvest the tender leaves, stems, and unopened flower buds; they have a hearty yet mild broccoli flavor.