75-80 Days to maturity. Vigna unguiculata subsp. sesquipedalis. Purple Mart Tsu In Yard Long Bean Seeds. Non-GMO, annual, open-pollinated, heirloom, heat-tolerant, pole, snap, Asian, specialty bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses. Purple Mart Tsu In Beans have been cultivated for centuries in India and China. This variety is desirable for its rich, deep, dark purple-colored pods. A generous producer of about 20" long beans weighing around 40 grams. The beans are tender and stringless with a dark purple coloration that turns black when cooked. The pods stay tender and retain color when cooked lightly, a quality highly valued in Asian cuisines. Alternative names include "Purple Yard Long Bean" and "Purple Chinese Long Bean."~180 seeds/oz.