Rapini is essentially a turnip grown for the tender blossom shoots, rather than the roots. Just as for turnips, they are relatively easy to grow, given good conditions. Soil should be loose, fertile, and kept evenly moist. direct sow in early spring for a spring crop or late summer for fall 1/4 in deep in rows 12-18 in apart. Thin to 6 to 8 in appart. For best germination soil should be cool to warm (50-80F) and kept moist.