- 紫菜苔 zǐcàitái purple choy suma purple variety of the leafy green vegetable known as choy sum (Brassica rapa var. purpurea)
- 紫菜薹 zǐcàitái purple choy sumpurple choy sum; a vegetable with purple stems and yellow flowers
- 甘紫菜 gānzǐcài lavera type of edible red algae used in cooking
- 紫菜包饭 zǐcàibāofàn gimbapKorean dish made by rolling up steamed rice and various fillings in a sheet of dried seaweed; also known as kimbap
- 紫菜属 zǐcàishǔ PorphyraPorphyra; a genus of red algae that includes several species of edible seaweed