Salad Burnet Herb Garden Seeds. 70 to 100 Days. Sanguisorba minor. Non-GMO, Heirloom, Open Pollinated. Perennial in USDA zones 4 to 8, but can be grown as an annual. Makes for a fantastic microgreen with a mild cucumber flavor. One of the most underrated gardening herbs in the world, salad burnet is a European delicacy grown to harvest its tender, aromatic greens.