I would plant on March 7 (or maybe a day or two before).
I like to plant potatoes and other tubers and root veggies when the moon is waning. The new moon is March 8, so the 7th is about ideal for that. If you plan to cut and plant pieces, cut them a few days early and let them heal/harden a bit before planting. I'd keep them in a sunny window until you plant them. Great find!
