By our calculations, you should look at sowing Hong Vit about 28 days before your last frost date.
Since this variety does not produce an edible root, it can be transplanted. But it is so fast growing that doing so may not be useful.
Sow in early spring to early summer, and again in late summer for fall crop (if desired). Thrives in cool weather. Make successive sowings every 2 weeks. Cloches can be used for extra-early plantings.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Hong Vit is a tender plant.