Edible Evanston will host its 7th Annual Seed Swap at the Evanston Ecology Center on Saturday, March 7, 2:15 p.m. to 4:30 p.m. Dozens of vegetable and flower types and hundreds of varieties, including unique heirlooms and locally saved seeds, are available for free to encourage people in Evanston to grow their own food and plants for pollinators. (Supplies are limited; maximum per family limits.)