Rapini is sometimes called Broccoli Raab. Like broccoli, it is grown for its unopened flower buds. Rapini is actually closely related to turnips and broccoli but is not grown as a root crop. Sorrento rapini seeds produce uniform dark green florets approximately 5 cm in diameter. Sorrento is the fastest rapini to mature. Gather the tender stems with a few leaves and the unopened flower buds for a reliable and nutritious addition to the kitchen or market garden. Plant in mid to late summer for a cool weather harvest well into winter. Expect plants to grow to 78 cm tall.